Initial release: BCCT-Hub dataset for NeurIPS 2026 E&D Track

LICENSE

@@ -0,0 +1,203 @@
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README.md

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+---
+license: apache-2.0
+language:
+  - en
+pretty_name: BCCT-Hub
+tags:
+  - representation-similarity
+  - representation-convergence
+  - cross-model-transport
+  - benchmark
+  - alignment
+  - evaluation
+  - neurips-2026
+size_categories:
+  - 1K<n<10K
+task_categories:
+  - feature-extraction
+configs:
+  - config_name: vision_atlas
+    data_files:
+      - split: pairs
+        path: atlas.json
+  - config_name: llm_atlas
+    data_files:
+      - split: pairs
+        path: llm_atlas.json
+  - config_name: audio_atlas
+    data_files:
+      - split: pairs
+        path: audio_atlas.json
+  - config_name: video_atlas
+    data_files:
+      - split: pairs
+        path: video_atlas.json
+  - config_name: meta_analysis
+    data_files:
+      - split: papers
+        path: meta_analysis.csv
+---
+
+# BCCT-Hub
+
+A benchmark and evaluation dataset for measuring **representation convergence
+and cross-model transport** across pretrained encoders. Released alongside the
+NeurIPS 2026 Evaluations & Datasets Track submission *"BCCT-Hub: A Benchmark
+and Toolkit for Measuring Representation Convergence Across Model Families."*
+
+The dataset packages four pre-computed pairwise compatibility atlases, 41
+pre-extracted feature tensors, statistical-analysis JSON outputs, an 88-paper
+meta-analysis CSV, and a Croissant 1.0 metadata file with the five
+Responsible-AI fields required by the NeurIPS 2026 E&D Track.
+
+## Atlas summary
+
+| Atlas | Pairs | Models | Source data |
+|---|---|---|---|
+| `atlas.json` (vision) | 190 | 20 vision encoders | CIFAR-100 test (5000 images) |
+| `llm_atlas.json` | 36 | 9 base LLMs | WikiText-103 (2000 passages of 128 tokens) |
+| `audio_atlas.json` (preliminary) | 15 | 6 audio encoders | LibriSpeech test-clean |
+| `video_atlas.json` (exploratory) | 15 | 6 video encoders | STL-10 pseudo-clips |
+| `meta_analysis.csv` | — | 88 papers tagged | Survey extraction |
+
+Each pairwise record carries six BCCT quantities:
+**R** (effective-rank bitrate proxy), **τ** (bidirectional Procrustes-vs-MLP
+transport linearity score), **λ** (alignment locality), **TAI** (transport
+asymmetry), **Δ** (bottleneck mismatch), and a **regime** label in
+{Collapsed, Local-Only, Convergent, Divergent}.
+
+## Headline empirical results
+
+- **Family is the strongest predictor of transport success:** mixed-effects
+  random-intercept LMM with both models in each pair contributing as random
+  effects yields β_family = 0.20 (p < 10⁻¹⁶), β_Δ = −0.034 (LRT χ² = 55.1,
+  p < 10⁻¹³), β_objective = 0.042 (p = 0.023).
+- **The bitrate–transport association survives dependence-aware resampling:**
+  block-bootstrap ρ = −0.70, 95 % CI [−0.82, −0.43].
+- **S_local predicts cross-encoder k-NN retrieval:** raw ρ = 0.76 (p =
+  1.1 × 10⁻⁴; Benjamini–Hochberg-adjusted p = 1.7 × 10⁻³ across 15 retrieval
+  correlations, 9/15 significant).
+
+## Repository layout
+
+```
+data/
+├── atlas.json                       (vision; 190 pairs)
+├── llm_atlas.json                   (language; 36 pairs)
+├── audio_atlas.json                 (preliminary; 15 pairs)
+├── video_atlas.json                 (exploratory; 15 pairs)
+├── croissant.json                   (Croissant 1.0 + RAI fields)
+├── meta_analysis.csv                (88-paper survey)
+├── bitrate_estimator_robustness.json
+├── audio_bitrate_sweep.json
+├── stl10_vs_cifar100_comparison.json
+├── cifar100_{test,train}_labels.pt  (paired CIFAR-100 labels)
+├── experiments/                     (mixed-effects, holdout, retrieval, stitching, ...)
+├── features/                        (vision: 20 encoders × 5000 CIFAR-100 test)
+├── features_train/                  (vision: 20 encoders × 5000 CIFAR-100 train, seed=42)
+├── features_external/               (5 out-of-atlas encoders for the case study)
+├── features_stl10/                  (vision robustness check)
+└── audio_features/                  (6 audio encoders × LibriSpeech test-clean)
+```
+
+## Croissant 1.0 metadata
+
+The dataset ships with a validated Croissant file
+([`data/croissant.json`](data/croissant.json), 17 KB). It declares SHA-256
+hashes for each atlas, a `conformsTo: http://mlcommons.org/croissant/1.0`
+header, and the five Responsible-AI fields required by the NeurIPS 2026
+Evaluations & Datasets Track (`rai:dataLimitations`, `rai:dataBiases`,
+`rai:dataPersonalSensitiveInformation`, `rai:dataUseCases`,
+`rai:dataSocialImpact`). The file passes the official validator:
+
+```bash
+pip install mlcroissant
+mlcroissant validate --jsonld data/croissant.json
+# → "Done." (zero errors)
+```
+
+## Intended uses
+
+1. Compatibility screening between candidate model pairs prior to
+   model-stitching or knowledge-transfer experiments.
+2. Reproducing and auditing the headline statistical findings of the paper.
+3. Extending the atlas with new encoders by re-running the extraction pipeline
+   in the companion code repository.
+4. Regression testing for representation-similarity research that builds on
+   CKA, mutual k-NN, Procrustes-based transport, or effective-rank proxies.
+
+## Out-of-scope uses (not validated, not recommended)
+
+- Deployment-time decisions about whether two production models are
+  interchangeable in a downstream application.
+- Safety or fairness certification of any individual encoder.
+- Inference about model training data, intellectual property, or copyright
+  provenance from feature-space similarity.
+
+BCCT scores are diagnostic summaries for comparative research, **not deployment
+guarantees**. See `data/croissant.json` `rai:dataSocialImpact` for the full
+scope statement.
+
+## Source-data licensing
+
+The dataset redistributes only **deterministic numerical activations and
+per-pair metric outputs**, never source images, audio, or text. Upstream
+benchmarks remain under their original licenses:
+
+- CIFAR-100: MIT-style permissive
+- STL-10: permissive (Coates et al., 2011)
+- WikiText-103: CC BY-SA 3.0
+- LibriSpeech test-clean: CC BY 4.0
+
+Our derivative numerical artifacts are released under **Apache-2.0** (see
+`LICENSE`).
+
+## Companion artifacts
+
+- Code repository (toolkit + paper source): <https://github.com/evaldataset/BCCT-Hub>
+- Anonymous mirror used during NeurIPS review:
+  <https://anonymous.4open.science/r/bcct-hub>
+
+## Citation
+
+If you use BCCT-Hub in your research, please cite the accompanying paper:
+
+```bibtex
+@misc{bcct_hub_2026,
+  title  = {{BCCT-Hub}: A Benchmark and Toolkit for Measuring Representation
+            Convergence Across Model Families},
+  author = {Anonymous Authors},
+  year   = {2026},
+  note   = {NeurIPS 2026 Evaluations \& Datasets Track (under review)}
+}
+```

data/atlas.json

@@ -0,0 +1,2952 @@
+{
+  "models": {
+    "beit_base_patch16_224": {
+      "metrics": {
+        "bitrate": 5.866,
+        "effective_rank": 58.31,
+        "dim": 768,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "beit",
+        "objective": "self-supervised",
+        "dim": 768,
+        "source": "timm"
+      }
+    },
+    "beit_large_patch16_224": {
+      "metrics": {
+        "bitrate": 6.555,
+        "effective_rank": 94.0,
+        "dim": 1024,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "beit",
+        "objective": "self-supervised",
+        "dim": 1024,
+        "source": "timm"
+      }
+    },
+    "clip_vitb16": {
+      "metrics": {
+        "bitrate": 6.841,
+        "effective_rank": 114.63,
+        "dim": 512,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "clip",
+        "objective": "contrastive",
+        "dim": 512,
+        "source": "transformers"
+      }
+    },
+    "clip_vitb32": {
+      "metrics": {
+        "bitrate": 6.855,
+        "effective_rank": 115.75,
+        "dim": 512,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "clip",
+        "objective": "contrastive",
+        "dim": 512,
+        "source": "transformers"
+      }
+    },
+    "clip_vitl14": {
+      "metrics": {
+        "bitrate": 7.442,
+        "effective_rank": 173.89,
+        "dim": 768,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "clip",
+        "objective": "contrastive",
+        "dim": 768,
+        "source": "transformers"
+      }
+    },
+    "convnext_base": {
+      "metrics": {
+        "bitrate": 8.241,
+        "effective_rank": 302.58,
+        "dim": 1024,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "supervised",
+        "objective": "supervised",
+        "dim": 1024,
+        "source": "timm"
+      }
+    },
+    "convnext_large": {
+      "metrics": {
+        "bitrate": 8.485,
+        "effective_rank": 358.18,
+        "dim": 1536,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "supervised",
+        "objective": "supervised",
+        "dim": 1536,
+        "source": "timm"
+      }
+    },
+    "dinov2_vitb14": {
+      "metrics": {
+        "bitrate": 8.6,
+        "effective_rank": 388.13,
+        "dim": 768,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "dinov2",
+        "objective": "self-supervised",
+        "dim": 768,
+        "source": "torch.hub"
+      }
+    },
+    "dinov2_vitg14": {
+      "metrics": {
+        "bitrate": 9.055,
+        "effective_rank": 531.78,
+        "dim": 1536,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "dinov2",
+        "objective": "self-supervised",
+        "dim": 1536,
+        "source": "torch.hub"
+      }
+    },
+    "dinov2_vitl14": {
+      "metrics": {
+        "bitrate": 8.963,
+        "effective_rank": 499.11,
+        "dim": 1024,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "dinov2",
+        "objective": "self-supervised",
+        "dim": 1024,
+        "source": "torch.hub"
+      }
+    },
+    "dinov2_vits14": {
+      "metrics": {
+        "bitrate": 7.752,
+        "effective_rank": 215.52,
+        "dim": 384,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "dinov2",
+        "objective": "self-supervised",
+        "dim": 384,
+        "source": "torch.hub"
+      }
+    },
+    "efficientnet_b0": {
+      "metrics": {
+        "bitrate": 8.228,
+        "effective_rank": 299.91,
+        "dim": 1280,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "supervised",
+        "objective": "supervised",
+        "dim": 1280,
+        "source": "timm"
+      }
+    },
+    "mixer_b16_224": {
+      "metrics": {
+        "bitrate": 8.037,
+        "effective_rank": 262.71,
+        "dim": 768,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "mlpmixer",
+        "objective": "supervised",
+        "dim": 768,
+        "source": "timm"
+      }
+    },
+    "resnet101": {
+      "metrics": {
+        "bitrate": 8.594,
+        "effective_rank": 386.42,
+        "dim": 2048,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "supervised",
+        "objective": "supervised",
+        "dim": 2048,
+        "source": "timm"
+      }
+    },
+    "resnet50": {
+      "metrics": {
+        "bitrate": 8.105,
+        "effective_rank": 275.3,
+        "dim": 2048,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "supervised",
+        "objective": "supervised",
+        "dim": 2048,
+        "source": "timm"
+      }
+    },
+    "swin_base_patch4_window7_224": {
+      "metrics": {
+        "bitrate": 8.398,
+        "effective_rank": 337.42,
+        "dim": 1024,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "supervised",
+        "objective": "supervised",
+        "dim": 1024,
+        "source": "timm"
+      }
+    },
+    "vit_base_patch16_224": {
+      "metrics": {
+        "bitrate": 7.77,
+        "effective_rank": 218.2,
+        "dim": 768,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "supervised",
+        "objective": "supervised",
+        "dim": 768,
+        "source": "timm"
+      }
+    },
+    "vit_base_patch16_224.mae": {
+      "metrics": {
+        "bitrate": 1.649,
+        "effective_rank": 3.14,
+        "dim": 768,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "mae",
+        "objective": "self-supervised",
+        "dim": 768,
+        "source": "timm"
+      }
+    },
+    "vit_large_patch16_224": {
+      "metrics": {
+        "bitrate": 7.661,
+        "effective_rank": 202.4,
+        "dim": 1024,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "supervised",
+        "objective": "supervised",
+        "dim": 1024,
+        "source": "timm"
+      }
+    },
+    "vit_large_patch16_224.mae": {
+      "metrics": {
+        "bitrate": 4.898,
+        "effective_rank": 29.82,
+        "dim": 1024,
+        "n_samples": 5000
+      },
+      "config": {
+        "family": "mae",
+        "objective": "self-supervised",
+        "dim": 1024,
+        "source": "timm"
+      }
+    }
+  },
+  "pairwise": {
+    "beit_base_patch16_224 <-> beit_large_patch16_224": {
+      "s_local": 0.238,
+      "s_global": 0.7855,
+      "lambda": 0.3025,
+      "tau": 0.3613,
+      "tau_a_to_b": 0.542,
+      "tau_b_to_a": 0.3613,
+      "tai": 0.2312,
+      "perf_linear": 0.1769,
+      "perf_best": 0.3764,
+      "delta": 0.689,
+      "regime": "Local-Only",
+      "raw_overlap": 0.2391
+    },
+    "beit_base_patch16_224 <-> clip_vitb16": {
+      "s_local": 0.046,
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+      "raw_overlap": 0.3632
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+      "raw_overlap": 0.3746
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+      "raw_overlap": 0.3845
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+      "raw_overlap": 0.2607
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+      "raw_overlap": 0.2137
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+      "raw_overlap": 0.2337
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+      "regime": "Local-Only",
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+      "raw_overlap": 0.0965
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+      "raw_overlap": 0.2088
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+      "raw_overlap": 0.2218
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+      "raw_overlap": 0.1771
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+      "raw_overlap": 0.1852
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+      "raw_overlap": 0.1559
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+      "raw_overlap": 0.1111
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+}

data/audio_atlas.json

@@ -0,0 +1,378 @@
+{
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+  "@context": {
+    "@language": "en",
+    "@vocab": "https://schema.org/",
+    "citeAs": "cr:citeAs",
+    "column": "cr:column",
+    "conformsTo": "dct:conformsTo",
+    "cr": "http://mlcommons.org/croissant/",
+    "rai": "http://mlcommons.org/croissant/RAI/",
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+  "@type": "sc:Dataset",
+  "name": "BCCT-Hub",
+  "description": "BCCT-Hub: a benchmark and toolkit for measuring representation convergence across model families. The release contains four pre-computed pairwise compatibility atlases (vision: 190 pairs across 20 encoders; language: 36 pairs across 9 LLMs; audio: 15 pairs; video: 15 pairs), 41 pre-extracted feature tensors, statistical-analysis JSON outputs, an 88-paper meta-analysis CSV, and a per-claim artifact manifest mapping every paper claim to its producing script. The release accompanies a NeurIPS 2026 Evaluations & Datasets Track submission and is intended for representation-similarity benchmarking research.",
+  "url": "https://anonymous.4open.science/r/bcct-hub",
+  "version": "0.1.0",
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+  "citeAs": "Anonymous Authors. BCCT-Hub: A Benchmark and Toolkit for Measuring Representation Convergence Across Model Families. NeurIPS 2026 Evaluations & Datasets Track (under review).",
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+  "rai:dataCollection": "Pairwise BCCT metrics (effective-rank bitrate, null-calibrated mutual k-NN, CKA, Procrustes-based transport linearity, transport asymmetry, bottleneck mismatch) were computed on features extracted from publicly available pretrained encoders (CLIP, DINOv2, ResNet, ViT, ConvNeXt, MAE, BEiT, MLP-Mixer, Swin, EfficientNet, Pythia, OPT, Phi-2, GPT-2, LLaMA-style models, and others). Source data are CIFAR-100 (vision test, 5000 images), STL-10 (vision robustness check; pseudo-clip rendering for video atlas), WikiText-103 (language, 2000 passages of 128 tokens), and LibriSpeech test-clean (audio). All extraction is deterministic with seed 42.",
+
+  "rai:dataCollectionType": ["Derived from public pretrained models and standard benchmarks"],
+  "rai:dataCollectionTimeFrame": {
+    "@type": "sc:DateTime",
+    "@value": "2026-01-01/2026-06-30"
+  },
+  "rai:dataCollectionTimeFrameDescription": "Feature extraction and atlas computation were performed in 2026 (Q1-Q2). Source pretrained-model snapshots and benchmark releases are documented per row in the released JSON.",
+  "rai:dataAnnotationProtocol": "No human annotation. All numerical values are deterministic outputs of standardized scripts (scripts/extract_features*.py, scripts/compute_alignment_atlas.py, scripts/compute_audio_atlas.py, scripts/compute_video_atlas.py, scripts/llm_experiment.py).",
+  "rai:dataAnnotationPlatform": "Not applicable (no human annotation).",
+  "rai:dataAnnotationAnalysis": "Not applicable.",
+  "rai:dataAnnotatorDemographics": "Not applicable.",
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+  "rai:dataPreprocessingProtocol": "Vision images: resize 256, center-crop 224, ImageNet mean/std normalization. STL-10: 96 to 224 upscale. LibriSpeech: 16 kHz mono, model-specific feature extractors. WikiText-103: 128-token windows, attention-mask-aware mean pooling. All pipelines fixed in scripts/ with seed=42.",
+
+  "rai:dataLimitations": "Audio uses a single clean English corpus (LibriSpeech test-clean) and is preliminary at n=15 pairs. Video uses STL-10 pseudo-clips (no genuine temporal structure) and is preliminary at n=15 pairs. The largest LLMs are 7B parameters (Mistral-7B, Falcon-7B, Pythia-6.9B); whether the regime distribution shifts at frontier scale (70B+) is untested. All LLMs in the atlas are base/pretrained-only, no instruction-tuned or RLHF models. The vision atlas is monolingual-equivalent (image-only, no text). Bitrate is reported as an effective-rank covariance proxy, not a calibrated mutual-information estimate. Transport linearity is defined relative to a standardized 2-layer MLP probe and is not an oracle nonlinear comparison. Pre-computed compatibility predictions assume the atlas's feature-extraction protocol; cross-protocol pairs are systematically flagged Divergent (see Appendix G of the accompanying paper).",
+
+  "rai:dataBiases": "The 88-paper meta-analysis (data/meta_analysis.csv) is biased toward vision (51/88) over language (16) and audio (3), reflecting publication frequency in representational similarity research up to 2026. The vision atlas is biased toward English-language web/image-corpus pretraining (CLIP, DINOv2 trained on LVD-142M; ImageNet-trained supervised baselines). The LLM atlas is English-only. Family selection is biased toward openly available checkpoints; closed-source models (GPT-4 class) are excluded by necessity, and recent permissively licensed code-generation or multilingual models may be under-represented.",
+
+  "rai:dataPersonalSensitiveInformation": "The release contains no personal or sensitive information. All four atlases are statistical summaries (similarity scores, regime labels) over public benchmark stimuli (CIFAR-100, STL-10, WikiText-103, LibriSpeech test-clean), and the released feature tensors are deterministic activations of public pretrained models on these public benchmarks. CIFAR-100 and STL-10 contain no personal data. LibriSpeech test-clean contains read public-domain audiobook recordings with speaker IDs released by the LibriVox/LibriSpeech project; we use only model activations, not raw audio. WikiText-103 is derived from Wikipedia featured/good articles. No demographic, health, financial, political, or religious information is collected, inferred, or released.",
+
+  "rai:dataUseCases": "Intended uses (validated in the accompanying paper): (a) compatibility screening between candidate model pairs prior to model-stitching or knowledge-transfer experiments; (b) reproducing and auditing the headline statistical findings of the paper (mixed-effects family beta=0.20, block-bootstrap rho=-0.70, retrieval rho=0.76); (c) extending the atlas with new encoders by re-running the extraction pipeline; (d) regression testing for representation-similarity research that builds on CKA, mutual k-NN, Procrustes-based transport, or effective-rank proxies. Out-of-scope uses (NOT validated and explicitly not recommended): (i) deployment-time decisions about whether two production models are interchangeable in a downstream application; (ii) safety or fairness certification of any individual encoder; (iii) inference about model training data, intellectual property, or copyright provenance from feature-space similarity.",
+
+  "rai:dataSocialImpact": "Positive impact: standardized evaluation protocols reduce wasted compute on incompatible model pairs, support reproducible representational-similarity research, and surface honest negative findings (e.g., the 35/190 disagreement cases in which CKA looks high but linear transport fails). Negative impact / misuse risk: BCCT scores are diagnostic summaries for comparative research, not deployment guarantees; we explicitly state that BCCT scores must not be used as certifications of safe model interchangeability. Misreading the scorecard as a safety stamp could be harmful when applied to production-critical interchangeability decisions. We mitigate this risk by making the scope statement prominent in the abstract, the conclusion, and the Reviewer Checklist, and by releasing the full per-claim manifest so any user can trace any reported number back to its producing script.",
+
+  "rai:dataReleaseMaintenancePlan": "Versioned release at the anonymous URL during review; planned migration to a persistent platform (Hugging Face Datasets and/or OpenML) at camera-ready, with a DOI for the 0.1.0 snapshot. Issue tracker on the public repository will accept extension requests (new encoders) and bug reports (numerical inconsistencies). Version policy: minor releases for added encoders; major releases for atlas-recomputation under different feature-extraction protocols.",
+
+  "isLiveDataset": false,
+
+  "creator": {
+    "@type": "Organization",
+    "name": "Anonymous"
+  },
+
+  "distribution": [
+    {
+      "@type": "cr:FileObject",
+      "@id": "bcct-hub-root",
+      "name": "bcct-hub-archive",
+      "description": "Root archive of the BCCT-Hub release; contains all feature tensors, experiment JSONs, atlas JSONs, scripts, and the paper. The release URL serves an anonymous source archive during NeurIPS 2026 review and a versioned snapshot post camera-ready.",
+      "contentUrl": "https://anonymous.4open.science/r/bcct-hub",
+      "encodingFormat": "application/zip",
+      "sha256": "PENDING_FINAL_REPOSITORY_SNAPSHOT_HASH"
+    },
+    {
+      "@type": "cr:FileObject",
+      "@id": "atlas-vision",
+      "name": "atlas.json",
+      "description": "Vision compatibility atlas: 190 pairs across 20 pretrained encoders on CIFAR-100 test (5000 images). Each pair has six BCCT metrics and a regime label.",
+      "contentUrl": "data/atlas.json",
+      "encodingFormat": "application/json",
+      "sha256": "c8826acc8352017e5f3e0c599666f71ee367fdf1677fa9cd4d6c6b64aa9a6a77"
+    },
+    {
+      "@type": "cr:FileObject",
+      "@id": "atlas-llm",
+      "name": "llm_atlas.json",
+      "description": "Language compatibility atlas: 36 pairs across 9 base LLMs on WikiText-103 (2000 passages of 128 tokens).",
+      "contentUrl": "data/llm_atlas.json",
+      "encodingFormat": "application/json",
+      "sha256": "56543b9b58b2855a64749aa9a158cdcb9a06fcf7f1bfc662ebe7afb1026b28dd"
+    },
+    {
+      "@type": "cr:FileObject",
+      "@id": "atlas-audio",
+      "name": "audio_atlas.json",
+      "description": "Preliminary audio compatibility atlas: 15 pairs across 6 audio encoders on LibriSpeech test-clean.",
+      "contentUrl": "data/audio_atlas.json",
+      "encodingFormat": "application/json",
+      "sha256": "f6c09f96fe301fc8156421a18d10534ea704cea0c598aac87bb9f4e0142c20a5"
+    },
+    {
+      "@type": "cr:FileObject",
+      "@id": "atlas-video",
+      "name": "video_atlas.json",
+      "description": "Exploratory video compatibility atlas: 15 pairs across 6 video encoders on STL-10 pseudo-clips.",
+      "contentUrl": "data/video_atlas.json",
+      "encodingFormat": "application/json",
+      "sha256": "189e11c2a70eb7ec96a3dd112d86b9ffa0651745c8d6ddfcec67a041f4b6e752"
+    },
+    {
+      "@type": "cr:FileObject",
+      "@id": "meta-analysis-csv",
+      "name": "meta_analysis.csv",
+      "description": "88-paper meta-analysis extraction (cite key, year, thread, domain, scale tier, metric type, reported value, inferred BCCT regime, key finding).",
+      "contentUrl": "data/meta_analysis.csv",
+      "encodingFormat": "text/csv",
+      "sha256": "d9e1c0d0eb70ec4d9d4036465643696a0b03222ae0783084c82fda40ed43b0d8"
+    },
+    {
+      "@type": "cr:FileSet",
+      "@id": "experiment-results",
+      "name": "experiments",
+      "description": "Statistical and downstream-utility analysis JSON outputs (mixed-effects, holdout validation, retrieval, stitching, external scorecard study, threshold sensitivity, probe variance, knn sensitivity, metric ablation, regime clustering, etc.).",
+      "containedIn": {"@id": "bcct-hub-root"},
+      "encodingFormat": "application/json",
+      "includes": "data/experiments/*.json"
+    },
+    {
+      "@type": "cr:FileSet",
+      "@id": "vision-features",
+      "name": "vision-features",
+      "description": "Pre-extracted feature tensors for 20 vision encoders on CIFAR-100 test (5000 images).",
+      "containedIn": {"@id": "bcct-hub-root"},
+      "encodingFormat": "application/x-pytorch",
+      "includes": "data/features/*.pt"
+    },
+    {
+      "@type": "cr:FileSet",
+      "@id": "vision-features-train",
+      "name": "vision-features-train",
+      "description": "Pre-extracted feature tensors for 20 vision encoders on a CIFAR-100 train subset (seed=42; 5000 images).",
+      "containedIn": {"@id": "bcct-hub-root"},
+      "encodingFormat": "application/x-pytorch",
+      "includes": "data/features_train/*.pt"
+    },
+    {
+      "@type": "cr:FileSet",
+      "@id": "external-features",
+      "name": "external-features",
+      "description": "Pre-extracted feature tensors for 5 out-of-atlas vision encoders used in the external scorecard case study (Appendix G).",
+      "containedIn": {"@id": "bcct-hub-root"},
+      "encodingFormat": "application/x-pytorch",
+      "includes": "data/features_external/**/*.pt"
+    }
+  ],
+
+  "recordSet": [
+    {
+      "@type": "cr:RecordSet",
+      "@id": "vision-pair-records",
+      "name": "vision-pairwise",
+      "description": "Per-pair records of the vision compatibility atlas. Each record is a unique pair of two of the 20 atlas encoders.",
+      "field": [
+        {
+          "@type": "cr:Field",
+          "@id": "vision-pair-records/pair_key",
+          "name": "pair_key",
+          "description": "Human-readable pair name in the form 'encoder_a <-> encoder_b'.",
+          "dataType": "sc:Text",
+          "source": {
+            "fileObject": {"@id": "atlas-vision"},
+            "extract": {"jsonPath": "$.pairwise[*]"}
+          }
+        },
+        {
+          "@type": "cr:Field",
+          "@id": "vision-pair-records/s_local",
+          "name": "s_local",
+          "description": "Null-calibrated mutual k-NN overlap (k=10, 1000 permutations).",
+          "dataType": "sc:Float"
+        },
+        {
+          "@type": "cr:Field",
+          "@id": "vision-pair-records/s_global",
+          "name": "s_global",
+          "description": "Linear centered kernel alignment (CKA) on Gram matrices.",
+          "dataType": "sc:Float"
+        },
+        {
+          "@type": "cr:Field",
+          "@id": "vision-pair-records/tau",
+          "name": "tau",
+          "description": "Bidirectional conservative transport linearity score: min(tau_AB, tau_BA), per-dimension R^2 ratio of orthogonal Procrustes to a standardized 2-layer MLP probe on 80/20 train/test splits.",
+          "dataType": "sc:Float"
+        },
+        {
+          "@type": "cr:Field",
+          "@id": "vision-pair-records/tai",
+          "name": "tai",
+          "description": "Transport asymmetry index: |perf(A->B) - perf(B->A)| / max.",
+          "dataType": "sc:Float"
+        },
+        {
+          "@type": "cr:Field",
+          "@id": "vision-pair-records/delta",
+          "name": "delta",
+          "description": "Bottleneck mismatch: absolute difference of effective-rank bitrate proxies.",
+          "dataType": "sc:Float"
+        },
+        {
+          "@type": "cr:Field",
+          "@id": "vision-pair-records/regime",
+          "name": "regime",
+          "description": "BCCT regime classification: one of {Collapsed, Local-Only, Convergent, Divergent}.",
+          "dataType": "sc:Text"
+        }
+      ]
+    },
+    {
+      "@type": "cr:RecordSet",
+      "@id": "meta-analysis-records",
+      "name": "meta-analysis",
+      "description": "88-paper extraction with thread, domain, scale, metric type, BCCT regime inference, and one-line key finding.",
+      "field": [
+        {
+          "@type": "cr:Field",
+          "@id": "meta-analysis-records/cite_key",
+          "name": "cite_key",
+          "dataType": "sc:Text",
+          "source": {
+            "fileObject": {"@id": "meta-analysis-csv"},
+            "extract": {"column": "cite_key"}
+          }
+        },
+        {
+          "@type": "cr:Field",
+          "@id": "meta-analysis-records/short_name",
+          "name": "short_name",
+          "dataType": "sc:Text"
+        },
+        {
+          "@type": "cr:Field",
+          "@id": "meta-analysis-records/year",
+          "name": "year",
+          "dataType": "sc:Integer"
+        },
+        {
+          "@type": "cr:Field",
+          "@id": "meta-analysis-records/thread",
+          "name": "thread",
+          "description": "One of {convergence, transport, latent_design, theory}.",
+          "dataType": "sc:Text"
+        },
+        {
+          "@type": "cr:Field",
+          "@id": "meta-analysis-records/domain",
+          "name": "domain",
+          "dataType": "sc:Text"
+        },
+        {
+          "@type": "cr:Field",
+          "@id": "meta-analysis-records/metric_type",
+          "name": "metric_type",
+          "dataType": "sc:Text"
+        },
+        {
+          "@type": "cr:Field",
+          "@id": "meta-analysis-records/bcct_regime",
+          "name": "bcct_regime",
+          "description": "Inferred BCCT regime; 'N/A' when reported evidence is insufficient.",
+          "dataType": "sc:Text"
+        },
+        {
+          "@type": "cr:Field",
+          "@id": "meta-analysis-records/key_finding",
+          "name": "key_finding",
+          "dataType": "sc:Text"
+        }
+      ]
+    }
+  ]
+}

data/experiments/bitrate_experiment.json

@@ -0,0 +1,1268 @@
+{
+  "experiment": "Track B: Bitrate Sweep",
+  "config": {
+    "k": 10,
+    "n_permutations": 100,
+    "seed": 42,
+    "device": "cuda:2",
+    "n_pairs": 8
+  },
+  "results": [
+    {
+      "pair": "dinov2_vitb14 <-> dinov2_vitl14",
+      "model_a": "dinov2_vitb14",
+      "model_b": "dinov2_vitl14",
+      "bitrate_sweep": {
+        "model_name": "dinov2_vitb14",
+        "reference_name": "dinov2_vitl14",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 8.6006,
+            "s_local": 0.5138,
+            "tau": 0.4052,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 8.3796,
+            "s_local": 0.514,
+            "tau": 0.4617,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 7.9645,
+            "s_local": 0.5134,
+            "tau": 0.5698,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 7.1548,
+            "s_local": 0.5,
+            "tau": 0.6972,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 6.2893,
+            "s_local": 0.4605,
+            "tau": 0.6736,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 5.369,
+            "s_local": 0.4044,
+            "tau": 0.5303,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "bitrate_sweep_reverse": {
+        "model_name": "dinov2_vitl14",
+        "reference_name": "dinov2_vitb14",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 8.9635,
+            "s_local": 0.5138,
+            "tau": 0.8042,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 8.7532,
+            "s_local": 0.5135,
+            "tau": 0.4444,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 8.3523,
+            "s_local": 0.5113,
+            "tau": 0.5611,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 7.5638,
+            "s_local": 0.4959,
+            "tau": 0.7339,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 6.7283,
+            "s_local": 0.4621,
+            "tau": 0.7706,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 5.8327,
+            "s_local": 0.4146,
+            "tau": 0.6721,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "neighborhood_alignment": {
+        "s_local": 0.5137,
+        "s_global": 0.6823,
+        "lambda_val": 0.7529,
+        "raw_overlap": 0.5147,
+        "null_mean": 0.002,
+        "interpretation": "No meaningful alignment (Collapsed or Divergent regime)."
+      },
+      "transport_stress_test": {
+        "model_a_name": "dinov2_vitb14",
+        "model_b_name": "dinov2_vitl14",
+        "points": [
+          {
+            "delta": 0.3626,
+            "tau_a_to_b": 0.4052,
+            "tau_b_to_a": 0.8065,
+            "tai": 0.0316,
+            "compression_level": 1.0,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 0.5836,
+            "tau_a_to_b": 0.4617,
+            "tau_b_to_a": 0.6979,
+            "tai": 0.0396,
+            "compression_level": 0.75,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 0.9987,
+            "tau_a_to_b": 0.5698,
+            "tau_b_to_a": 0.4617,
+            "tai": 0.0925,
+            "compression_level": 0.5,
+            "regime": "Convergent"
+          },
+          {
+            "delta": 1.8084,
+            "tau_a_to_b": 0.6972,
+            "tau_b_to_a": 0.1555,
+            "tai": 0.363,
+            "compression_level": 0.25,
+            "regime": "Convergent"
+          },
+          {
+            "delta": 2.6739,
+            "tau_a_to_b": 0.6736,
+            "tau_b_to_a": 0.0368,
+            "tai": 0.4956,
+            "compression_level": 0.125,
+            "regime": "Convergent"
+          }
+        ]
+      }
+    },
+    {
+      "pair": "resnet50 <-> resnet101",
+      "model_a": "resnet50",
+      "model_b": "resnet101",
+      "bitrate_sweep": {
+        "model_name": "resnet50",
+        "reference_name": "resnet101",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 8.1057,
+            "s_local": 0.3194,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 8.0462,
+            "s_local": 0.3197,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 7.8477,
+            "s_local": 0.3198,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
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+            "s_local": 0.3202,
+            "tau": 0.9843,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 6.6871,
+            "s_local": 0.317,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 5.9988,
+            "s_local": 0.3037,
+            "tau": 0.9888,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "bitrate_sweep_reverse": {
+        "model_name": "resnet101",
+        "reference_name": "resnet50",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 8.5948,
+            "s_local": 0.3195,
+            "tau": 0.5431,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 8.5094,
+            "s_local": 0.3195,
+            "tau": 0.6069,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 8.2593,
+            "s_local": 0.3193,
+            "tau": 0.572,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 7.6568,
+            "s_local": 0.3177,
+            "tau": 0.4741,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 6.9564,
+            "s_local": 0.3111,
+            "tau": 0.5595,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 6.2038,
+            "s_local": 0.2986,
+            "tau": 0.7375,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "neighborhood_alignment": {
+        "s_local": 0.3195,
+        "s_global": 0.7468,
+        "lambda_val": 0.4278,
+        "raw_overlap": 0.3208,
+        "null_mean": 0.002,
+        "interpretation": "Inflated: CKA confounded by scale; local alignment not significant."
+      },
+      "transport_stress_test": {
+        "model_a_name": "resnet50",
+        "model_b_name": "resnet101",
+        "points": [
+          {
+            "delta": 0.4883,
+            "tau_a_to_b": 1.0,
+            "tau_b_to_a": 0.5428,
+            "tai": 0.2349,
+            "compression_level": 1.0,
+            "regime": "Convergent"
+          },
+          {
+            "delta": 0.5478,
+            "tau_a_to_b": 1.0,
+            "tau_b_to_a": 0.4954,
+            "tai": 0.3537,
+            "compression_level": 0.75,
+            "regime": "Convergent"
+          },
+          {
+            "delta": 0.7463,
+            "tau_a_to_b": 1.0,
+            "tau_b_to_a": 0.3523,
+            "tai": 0.4586,
+            "compression_level": 0.5,
+            "regime": "Convergent"
+          },
+          {
+            "delta": 1.2704,
+            "tau_a_to_b": 0.9843,
+            "tau_b_to_a": 0.1682,
+            "tai": 0.5393,
+            "compression_level": 0.25,
+            "regime": "Convergent"
+          },
+          {
+            "delta": 1.9069,
+            "tau_a_to_b": 1.0,
+            "tau_b_to_a": 0.1058,
+            "tai": 0.5916,
+            "compression_level": 0.125,
+            "regime": "Convergent"
+          }
+        ]
+      }
+    },
+    {
+      "pair": "clip_vitb16 <-> clip_vitl14",
+      "model_a": "clip_vitb16",
+      "model_b": "clip_vitl14",
+      "bitrate_sweep": {
+        "model_name": "clip_vitb16",
+        "reference_name": "clip_vitl14",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 6.8409,
+            "s_local": 0.2907,
+            "tau": 0.9405,
+            "downstream_acc": null
+          },
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+            "s_local": 0.2908,
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+            "downstream_acc": null
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+            "s_local": 0.2848,
+            "tau": 0.8964,
+            "downstream_acc": null
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+            "s_local": 0.2632,
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+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 4.459,
+            "s_local": 0.2208,
+            "tau": 0.7091,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "bitrate_sweep_reverse": {
+        "model_name": "clip_vitl14",
+        "reference_name": "clip_vitb16",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 7.4424,
+            "s_local": 0.2907,
+            "tau": 0.4683,
+            "downstream_acc": null
+          },
+          {
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+            "bitrate": 7.4123,
+            "s_local": 0.2908,
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+            "downstream_acc": null
+          },
+          {
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+            "bitrate": 7.1609,
+            "s_local": 0.2909,
+            "tau": 0.4617,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 6.5562,
+            "s_local": 0.2884,
+            "tau": 0.6475,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 5.8432,
+            "s_local": 0.2762,
+            "tau": 0.7375,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 5.0513,
+            "s_local": 0.2477,
+            "tau": 0.7059,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "neighborhood_alignment": {
+        "s_local": 0.2907,
+        "s_global": 0.7183,
+        "lambda_val": 0.4047,
+        "raw_overlap": 0.2921,
+        "null_mean": 0.002,
+        "interpretation": "Inflated: CKA confounded by scale; local alignment not significant."
+      },
+      "transport_stress_test": {
+        "model_a_name": "clip_vitb16",
+        "model_b_name": "clip_vitl14",
+        "points": [
+          {
+            "delta": 0.6011,
+            "tau_a_to_b": 0.9405,
+            "tau_b_to_a": 0.4698,
+            "tai": 0.0695,
+            "compression_level": 1.0,
+            "regime": "Convergent"
+          },
+          {
+            "delta": 0.6774,
+            "tau_a_to_b": 0.9339,
+            "tau_b_to_a": 0.5356,
+            "tai": 0.0607,
+            "compression_level": 0.75,
+            "regime": "Convergent"
+          },
+          {
+            "delta": 0.9174,
+            "tau_a_to_b": 0.9253,
+            "tau_b_to_a": 0.5265,
+            "tai": 0.0815,
+            "compression_level": 0.5,
+            "regime": "Convergent"
+          },
+          {
+            "delta": 1.4965,
+            "tau_a_to_b": 0.8964,
+            "tau_b_to_a": 0.3365,
+            "tai": 0.2044,
+            "compression_level": 0.25,
+            "regime": "Convergent"
+          },
+          {
+            "delta": 2.2001,
+            "tau_a_to_b": 0.8118,
+            "tau_b_to_a": 0.1519,
+            "tai": 0.3311,
+            "compression_level": 0.125,
+            "regime": "Convergent"
+          }
+        ]
+      }
+    },
+    {
+      "pair": "dinov2_vitl14 <-> beit_large_patch16_224",
+      "model_a": "dinov2_vitl14",
+      "model_b": "beit_large_patch16_224",
+      "bitrate_sweep": {
+        "model_name": "dinov2_vitl14",
+        "reference_name": "beit_large_patch16_224",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 8.9635,
+            "s_local": 0.0723,
+            "tau": 0.088,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 8.7532,
+            "s_local": 0.0724,
+            "tau": 0.1048,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 8.3523,
+            "s_local": 0.0724,
+            "tau": 0.0545,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 7.5638,
+            "s_local": 0.0724,
+            "tau": 0.029,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 6.7283,
+            "s_local": 0.0715,
+            "tau": 0.0401,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 5.8327,
+            "s_local": 0.0683,
+            "tau": 0.0784,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "bitrate_sweep_reverse": {
+        "model_name": "beit_large_patch16_224",
+        "reference_name": "dinov2_vitl14",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 6.5552,
+            "s_local": 0.0723,
+            "tau": 0.0173,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 6.462,
+            "s_local": 0.0725,
+            "tau": 0.0356,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 6.2432,
+            "s_local": 0.073,
+            "tau": 0.0283,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 5.7448,
+            "s_local": 0.0731,
+            "tau": 0.0323,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 5.168,
+            "s_local": 0.0696,
+            "tau": 0.0342,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 4.5391,
+            "s_local": 0.0626,
+            "tau": 0.0227,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "neighborhood_alignment": {
+        "s_local": 0.0723,
+        "s_global": 0.1615,
+        "lambda_val": 0.4474,
+        "raw_overlap": 0.0741,
+        "null_mean": 0.002,
+        "interpretation": "No meaningful alignment (Collapsed or Divergent regime)."
+      },
+      "transport_stress_test": {
+        "model_a_name": "dinov2_vitl14",
+        "model_b_name": "beit_large_patch16_224",
+        "points": [
+          {
+            "delta": 2.4089,
+            "tau_a_to_b": 0.088,
+            "tau_b_to_a": 0.0176,
+            "tai": 0.9228,
+            "compression_level": 1.0,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 2.1986,
+            "tau_a_to_b": 0.1048,
+            "tau_b_to_a": 0.0571,
+            "tai": 0.9106,
+            "compression_level": 0.75,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 1.7977,
+            "tau_a_to_b": 0.0545,
+            "tau_b_to_a": 0.0,
+            "tai": 0.9482,
+            "compression_level": 0.5,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 1.0092,
+            "tau_a_to_b": 0.029,
+            "tau_b_to_a": 0.0,
+            "tai": 0.9729,
+            "compression_level": 0.25,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 0.1737,
+            "tau_a_to_b": 0.0401,
+            "tau_b_to_a": 0.0011,
+            "tai": 0.9493,
+            "compression_level": 0.125,
+            "regime": "Local-Only"
+          }
+        ]
+      }
+    },
+    {
+      "pair": "vit_base_patch16_224 <-> resnet50",
+      "model_a": "vit_base_patch16_224",
+      "model_b": "resnet50",
+      "bitrate_sweep": {
+        "model_name": "vit_base_patch16_224",
+        "reference_name": "resnet50",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 7.7697,
+            "s_local": 0.2137,
+            "tau": 0.2532,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 7.6488,
+            "s_local": 0.2137,
+            "tau": 0.2471,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 7.3755,
+            "s_local": 0.2143,
+            "tau": 0.2272,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 6.717,
+            "s_local": 0.2123,
+            "tau": 0.253,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 5.931,
+            "s_local": 0.2023,
+            "tau": 0.4112,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 5.0835,
+            "s_local": 0.185,
+            "tau": 0.5903,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "bitrate_sweep_reverse": {
+        "model_name": "resnet50",
+        "reference_name": "vit_base_patch16_224",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 8.1057,
+            "s_local": 0.2137,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 8.0462,
+            "s_local": 0.2137,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 7.8477,
+            "s_local": 0.2137,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 7.3236,
+            "s_local": 0.214,
+            "tau": 0.9894,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 6.6871,
+            "s_local": 0.212,
+            "tau": 0.8648,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 5.9988,
+            "s_local": 0.2044,
+            "tau": 0.8236,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "neighborhood_alignment": {
+        "s_local": 0.2137,
+        "s_global": 0.6391,
+        "lambda_val": 0.3344,
+        "raw_overlap": 0.2153,
+        "null_mean": 0.002,
+        "interpretation": "No meaningful alignment (Collapsed or Divergent regime)."
+      },
+      "transport_stress_test": {
+        "model_a_name": "vit_base_patch16_224",
+        "model_b_name": "resnet50",
+        "points": [
+          {
+            "delta": 0.3352,
+            "tau_a_to_b": 0.2532,
+            "tau_b_to_a": 1.0,
+            "tai": 0.3908,
+            "compression_level": 1.0,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 0.4561,
+            "tau_a_to_b": 0.2471,
+            "tau_b_to_a": 1.0,
+            "tai": 0.3477,
+            "compression_level": 0.75,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 0.7294,
+            "tau_a_to_b": 0.2272,
+            "tau_b_to_a": 1.0,
+            "tai": 0.1489,
+            "compression_level": 0.5,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 1.3879,
+            "tau_a_to_b": 0.253,
+            "tau_b_to_a": 0.6614,
+            "tai": 0.4305,
+            "compression_level": 0.25,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 2.1739,
+            "tau_a_to_b": 0.4112,
+            "tau_b_to_a": 0.2241,
+            "tai": 0.6517,
+            "compression_level": 0.125,
+            "regime": "Local-Only"
+          }
+        ]
+      }
+    },
+    {
+      "pair": "dinov2_vitb14 <-> clip_vitb16",
+      "model_a": "dinov2_vitb14",
+      "model_b": "clip_vitb16",
+      "bitrate_sweep": {
+        "model_name": "dinov2_vitb14",
+        "reference_name": "clip_vitb16",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 8.6006,
+            "s_local": 0.2241,
+            "tau": 0.0448,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 8.3796,
+            "s_local": 0.2245,
+            "tau": 0.0351,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 7.9645,
+            "s_local": 0.2241,
+            "tau": 0.0262,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 7.1548,
+            "s_local": 0.222,
+            "tau": 0.0227,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 6.2893,
+            "s_local": 0.2127,
+            "tau": 0.0268,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 5.369,
+            "s_local": 0.202,
+            "tau": 0.0388,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "bitrate_sweep_reverse": {
+        "model_name": "clip_vitb16",
+        "reference_name": "dinov2_vitb14",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 6.8409,
+            "s_local": 0.224,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 6.7647,
+            "s_local": 0.2242,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 6.5247,
+            "s_local": 0.2244,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 5.9455,
+            "s_local": 0.2212,
+            "tau": 0.8323,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 5.242,
+            "s_local": 0.2052,
+            "tau": 0.6559,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 4.459,
+            "s_local": 0.1688,
+            "tau": 0.528,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "neighborhood_alignment": {
+        "s_local": 0.2241,
+        "s_global": 0.4886,
+        "lambda_val": 0.4587,
+        "raw_overlap": 0.2256,
+        "null_mean": 0.0019,
+        "interpretation": "No meaningful alignment (Collapsed or Divergent regime)."
+      },
+      "transport_stress_test": {
+        "model_a_name": "dinov2_vitb14",
+        "model_b_name": "clip_vitb16",
+        "points": [
+          {
+            "delta": 1.7598,
+            "tau_a_to_b": 0.0448,
+            "tau_b_to_a": 1.0,
+            "tai": 0.3956,
+            "compression_level": 1.0,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 1.5388,
+            "tau_a_to_b": 0.0351,
+            "tau_b_to_a": 1.0,
+            "tai": 0.417,
+            "compression_level": 0.75,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 1.1237,
+            "tau_a_to_b": 0.0262,
+            "tau_b_to_a": 1.0,
+            "tai": 0.3577,
+            "compression_level": 0.5,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 0.3139,
+            "tau_a_to_b": 0.0227,
+            "tau_b_to_a": 0.8184,
+            "tai": 0.064,
+            "compression_level": 0.25,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 0.5515,
+            "tau_a_to_b": 0.0268,
+            "tau_b_to_a": 0.5208,
+            "tai": 0.2702,
+            "compression_level": 0.125,
+            "regime": "Local-Only"
+          }
+        ]
+      }
+    },
+    {
+      "pair": "vit_base_patch16_224.mae <-> vit_base_patch16_224",
+      "model_a": "vit_base_patch16_224.mae",
+      "model_b": "vit_base_patch16_224",
+      "bitrate_sweep": {
+        "model_name": "vit_base_patch16_224.mae",
+        "reference_name": "vit_base_patch16_224",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 1.6488,
+            "s_local": 0.0265,
+            "tau": 0.1959,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 1.647,
+            "s_local": 0.0266,
+            "tau": 0.2023,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 1.6404,
+            "s_local": 0.0265,
+            "tau": 0.2072,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 1.617,
+            "s_local": 0.0265,
+            "tau": 0.1751,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 1.5787,
+            "s_local": 0.0258,
+            "tau": 0.139,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 1.5264,
+            "s_local": 0.0252,
+            "tau": 0.1175,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "bitrate_sweep_reverse": {
+        "model_name": "vit_base_patch16_224",
+        "reference_name": "vit_base_patch16_224.mae",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 7.7697,
+            "s_local": 0.0265,
+            "tau": 0.0024,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 7.6488,
+            "s_local": 0.0266,
+            "tau": 0.0024,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 7.3755,
+            "s_local": 0.0264,
+            "tau": 0.0024,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 6.717,
+            "s_local": 0.0263,
+            "tau": 0.0025,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 5.931,
+            "s_local": 0.0258,
+            "tau": 0.0026,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 5.0835,
+            "s_local": 0.0249,
+            "tau": 0.0026,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "neighborhood_alignment": {
+        "s_local": 0.0265,
+        "s_global": 0.1539,
+        "lambda_val": 0.1724,
+        "raw_overlap": 0.0285,
+        "null_mean": 0.002,
+        "interpretation": "No meaningful alignment (Collapsed or Divergent regime)."
+      },
+      "transport_stress_test": {
+        "model_a_name": "vit_base_patch16_224.mae",
+        "model_b_name": "vit_base_patch16_224",
+        "points": [
+          {
+            "delta": 6.1207,
+            "tau_a_to_b": 0.1959,
+            "tau_b_to_a": 0.0024,
+            "tai": 0.663,
+            "compression_level": 1.0,
+            "regime": "Collapsed"
+          },
+          {
+            "delta": 6.1225,
+            "tau_a_to_b": 0.2023,
+            "tau_b_to_a": 0.0023,
+            "tai": 0.6768,
+            "compression_level": 0.75,
+            "regime": "Collapsed"
+          },
+          {
+            "delta": 6.1291,
+            "tau_a_to_b": 0.2072,
+            "tau_b_to_a": 0.0023,
+            "tai": 0.6874,
+            "compression_level": 0.5,
+            "regime": "Collapsed"
+          },
+          {
+            "delta": 6.1525,
+            "tau_a_to_b": 0.1751,
+            "tau_b_to_a": 0.0022,
+            "tai": 0.6629,
+            "compression_level": 0.25,
+            "regime": "Collapsed"
+          },
+          {
+            "delta": 6.1908,
+            "tau_a_to_b": 0.139,
+            "tau_b_to_a": 0.002,
+            "tai": 0.6573,
+            "compression_level": 0.125,
+            "regime": "Collapsed"
+          }
+        ]
+      }
+    },
+    {
+      "pair": "vit_base_patch16_224.mae <-> resnet101",
+      "model_a": "vit_base_patch16_224.mae",
+      "model_b": "resnet101",
+      "bitrate_sweep": {
+        "model_name": "vit_base_patch16_224.mae",
+        "reference_name": "resnet101",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 1.6488,
+            "s_local": 0.0302,
+            "tau": 0.2671,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 1.647,
+            "s_local": 0.0302,
+            "tau": 0.2805,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 1.6404,
+            "s_local": 0.0301,
+            "tau": 0.2933,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 1.617,
+            "s_local": 0.0301,
+            "tau": 0.2795,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 1.5787,
+            "s_local": 0.0296,
+            "tau": 0.2593,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 1.5264,
+            "s_local": 0.0287,
+            "tau": 0.2333,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "bitrate_sweep_reverse": {
+        "model_name": "resnet101",
+        "reference_name": "vit_base_patch16_224.mae",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 8.5948,
+            "s_local": 0.0302,
+            "tau": 0.0037,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 8.5094,
+            "s_local": 0.0303,
+            "tau": 0.0038,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 8.2593,
+            "s_local": 0.0303,
+            "tau": 0.0037,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 7.6568,
+            "s_local": 0.0305,
+            "tau": 0.0031,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 6.9564,
+            "s_local": 0.0303,
+            "tau": 0.0028,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 6.2038,
+            "s_local": 0.0292,
+            "tau": 0.0028,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "neighborhood_alignment": {
+        "s_local": 0.0302,
+        "s_global": 0.144,
+        "lambda_val": 0.2095,
+        "raw_overlap": 0.0321,
+        "null_mean": 0.002,
+        "interpretation": "No meaningful alignment (Collapsed or Divergent regime)."
+      },
+      "transport_stress_test": {
+        "model_a_name": "vit_base_patch16_224.mae",
+        "model_b_name": "resnet101",
+        "points": [
+          {
+            "delta": 6.9452,
+            "tau_a_to_b": 0.2671,
+            "tau_b_to_a": 0.0037,
+            "tai": 0.7379,
+            "compression_level": 1.0,
+            "regime": "Collapsed"
+          },
+          {
+            "delta": 6.947,
+            "tau_a_to_b": 0.2805,
+            "tau_b_to_a": 0.0036,
+            "tai": 0.7522,
+            "compression_level": 0.75,
+            "regime": "Collapsed"
+          },
+          {
+            "delta": 6.9536,
+            "tau_a_to_b": 0.2933,
+            "tau_b_to_a": 0.0036,
+            "tai": 0.7669,
+            "compression_level": 0.5,
+            "regime": "Collapsed"
+          },
+          {
+            "delta": 6.977,
+            "tau_a_to_b": 0.2795,
+            "tau_b_to_a": 0.0033,
+            "tai": 0.7818,
+            "compression_level": 0.25,
+            "regime": "Collapsed"
+          },
+          {
+            "delta": 7.0153,
+            "tau_a_to_b": 0.2593,
+            "tau_b_to_a": 0.0029,
+            "tai": 0.8087,
+            "compression_level": 0.125,
+            "regime": "Collapsed"
+          }
+        ]
+      }
+    }
+  ]
+}

data/experiments/bitrate_experiment_full.json

@@ -0,0 +1,1268 @@
+{
+  "experiment": "Track B: Bitrate Sweep",
+  "config": {
+    "k": 10,
+    "n_permutations": 50,
+    "seed": 42,
+    "device": "cuda:0",
+    "n_pairs": 8
+  },
+  "results": [
+    {
+      "pair": "dinov2_vitb14 <-> dinov2_vitl14",
+      "model_a": "dinov2_vitb14",
+      "model_b": "dinov2_vitl14",
+      "bitrate_sweep": {
+        "model_name": "dinov2_vitb14",
+        "reference_name": "dinov2_vitl14",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 9.3627,
+            "s_local": 0.5137,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 9.0057,
+            "s_local": 0.514,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 8.4584,
+            "s_local": 0.5133,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 7.4962,
+            "s_local": 0.4999,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 6.5239,
+            "s_local": 0.4605,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 5.5396,
+            "s_local": 0.4044,
+            "tau": 1.0,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "bitrate_sweep_reverse": {
+        "model_name": "dinov2_vitl14",
+        "reference_name": "dinov2_vitb14",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 9.7616,
+            "s_local": 0.5137,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 9.4075,
+            "s_local": 0.5135,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 8.8634,
+            "s_local": 0.5113,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 7.905,
+            "s_local": 0.4959,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 6.9405,
+            "s_local": 0.462,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 5.9646,
+            "s_local": 0.4146,
+            "tau": 1.0,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "neighborhood_alignment": {
+        "s_local": 0.5137,
+        "s_global": 0.6823,
+        "lambda_val": 0.7529,
+        "raw_overlap": 0.5147,
+        "null_mean": 0.0021,
+        "interpretation": "No meaningful alignment (Collapsed or Divergent regime)."
+      },
+      "transport_stress_test": {
+        "model_a_name": "dinov2_vitb14",
+        "model_b_name": "dinov2_vitl14",
+        "points": [
+          {
+            "delta": 0.3988,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 0.0,
+            "compression_level": 1.0,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 0.7558,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 0.0,
+            "compression_level": 0.75,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 1.3031,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 1.0,
+            "tai": 1.0,
+            "compression_level": 0.5,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 2.2654,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.1576,
+            "tai": 1.0,
+            "compression_level": 0.25,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 3.2377,
+            "tau_a_to_b": 1.0,
+            "tau_b_to_a": 0.0,
+            "tai": 0.9144,
+            "compression_level": 0.125,
+            "regime": "Convergent"
+          }
+        ]
+      }
+    },
+    {
+      "pair": "resnet50 <-> resnet101",
+      "model_a": "resnet50",
+      "model_b": "resnet101",
+      "bitrate_sweep": {
+        "model_name": "resnet50",
+        "reference_name": "resnet101",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 10.363,
+            "s_local": 0.3194,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 10.1057,
+            "s_local": 0.3197,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 9.6217,
+            "s_local": 0.3198,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 8.7042,
+            "s_local": 0.3202,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 7.7545,
+            "s_local": 0.317,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 6.7991,
+            "s_local": 0.3037,
+            "tau": 1.0,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "bitrate_sweep_reverse": {
+        "model_name": "resnet101",
+        "reference_name": "resnet50",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 10.4752,
+            "s_local": 0.3195,
+            "tau": 0.1015,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 10.1962,
+            "s_local": 0.3195,
+            "tau": 0.2651,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 9.6932,
+            "s_local": 0.3193,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 8.7623,
+            "s_local": 0.3177,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 7.8079,
+            "s_local": 0.3111,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 6.847,
+            "s_local": 0.2986,
+            "tau": 1.0,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "neighborhood_alignment": {
+        "s_local": 0.3195,
+        "s_global": 0.7468,
+        "lambda_val": 0.4278,
+        "raw_overlap": 0.3208,
+        "null_mean": 0.002,
+        "interpretation": "Inflated: CKA confounded by scale; local alignment not significant."
+      },
+      "transport_stress_test": {
+        "model_a_name": "resnet50",
+        "model_b_name": "resnet101",
+        "points": [
+          {
+            "delta": 0.112,
+            "tau_a_to_b": 1.0,
+            "tau_b_to_a": 0.1073,
+            "tai": 0.816,
+            "compression_level": 1.0,
+            "regime": "Convergent"
+          },
+          {
+            "delta": 0.3693,
+            "tau_a_to_b": 1.0,
+            "tau_b_to_a": 0.0963,
+            "tai": 0.9704,
+            "compression_level": 0.75,
+            "regime": "Convergent"
+          },
+          {
+            "delta": 0.8533,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0778,
+            "tai": 1.0,
+            "compression_level": 0.5,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 1.7708,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0195,
+            "tai": 1.0,
+            "compression_level": 0.25,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 2.7205,
+            "tau_a_to_b": 1.0,
+            "tau_b_to_a": 0.0,
+            "tai": 1.0,
+            "compression_level": 0.125,
+            "regime": "Convergent"
+          }
+        ]
+      }
+    },
+    {
+      "pair": "clip_vitb16 <-> clip_vitl14",
+      "model_a": "clip_vitb16",
+      "model_b": "clip_vitl14",
+      "bitrate_sweep": {
+        "model_name": "clip_vitb16",
+        "reference_name": "clip_vitl14",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 8.4655,
+            "s_local": 0.2907,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 8.2003,
+            "s_local": 0.2908,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 7.7053,
+            "s_local": 0.292,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 6.7916,
+            "s_local": 0.2848,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 5.8464,
+            "s_local": 0.2632,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 4.8846,
+            "s_local": 0.2208,
+            "tau": 1.0,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "bitrate_sweep_reverse": {
+        "model_name": "clip_vitl14",
+        "reference_name": "clip_vitb16",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 8.9308,
+            "s_local": 0.2907,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 8.8035,
+            "s_local": 0.2908,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 8.305,
+            "s_local": 0.2909,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 7.3828,
+            "s_local": 0.2884,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 6.4354,
+            "s_local": 0.2762,
+            "tau": 1.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 5.4714,
+            "s_local": 0.2477,
+            "tau": 1.0,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "neighborhood_alignment": {
+        "s_local": 0.2907,
+        "s_global": 0.7183,
+        "lambda_val": 0.4047,
+        "raw_overlap": 0.2921,
+        "null_mean": 0.002,
+        "interpretation": "Inflated: CKA confounded by scale; local alignment not significant."
+      },
+      "transport_stress_test": {
+        "model_a_name": "clip_vitb16",
+        "model_b_name": "clip_vitl14",
+        "points": [
+          {
+            "delta": 0.4651,
+            "tau_a_to_b": 1.0,
+            "tau_b_to_a": 1.0,
+            "tai": 0.3987,
+            "compression_level": 1.0,
+            "regime": "Convergent"
+          },
+          {
+            "delta": 0.7304,
+            "tau_a_to_b": 1.0,
+            "tau_b_to_a": 1.0,
+            "tai": 0.4038,
+            "compression_level": 0.75,
+            "regime": "Convergent"
+          },
+          {
+            "delta": 1.2254,
+            "tau_a_to_b": 1.0,
+            "tau_b_to_a": 1.0,
+            "tai": 0.3837,
+            "compression_level": 0.5,
+            "regime": "Convergent"
+          },
+          {
+            "delta": 2.1391,
+            "tau_a_to_b": 1.0,
+            "tau_b_to_a": 0.902,
+            "tai": 0.4938,
+            "compression_level": 0.25,
+            "regime": "Convergent"
+          },
+          {
+            "delta": 3.0843,
+            "tau_a_to_b": 1.0,
+            "tau_b_to_a": 0.3763,
+            "tai": 0.5487,
+            "compression_level": 0.125,
+            "regime": "Convergent"
+          }
+        ]
+      }
+    },
+    {
+      "pair": "dinov2_vitl14 <-> beit_large_patch16_224",
+      "model_a": "dinov2_vitl14",
+      "model_b": "beit_large_patch16_224",
+      "bitrate_sweep": {
+        "model_name": "dinov2_vitl14",
+        "reference_name": "beit_large_patch16_224",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 9.7616,
+            "s_local": 0.0722,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 9.4075,
+            "s_local": 0.0724,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 8.8634,
+            "s_local": 0.0724,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 7.905,
+            "s_local": 0.0724,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 6.9405,
+            "s_local": 0.0715,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 5.9646,
+            "s_local": 0.0683,
+            "tau": 0.0,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "bitrate_sweep_reverse": {
+        "model_name": "beit_large_patch16_224",
+        "reference_name": "dinov2_vitl14",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 9.3985,
+            "s_local": 0.0723,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 9.0829,
+            "s_local": 0.0725,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 8.5684,
+            "s_local": 0.073,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 7.6361,
+            "s_local": 0.0731,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 6.6864,
+            "s_local": 0.0697,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 5.7313,
+            "s_local": 0.0626,
+            "tau": 0.0,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "neighborhood_alignment": {
+        "s_local": 0.0722,
+        "s_global": 0.1615,
+        "lambda_val": 0.4473,
+        "raw_overlap": 0.0741,
+        "null_mean": 0.002,
+        "interpretation": "No meaningful alignment (Collapsed or Divergent regime)."
+      },
+      "transport_stress_test": {
+        "model_a_name": "dinov2_vitl14",
+        "model_b_name": "beit_large_patch16_224",
+        "points": [
+          {
+            "delta": 0.3632,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 0.0,
+            "compression_level": 1.0,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 0.0092,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 0.0,
+            "compression_level": 0.75,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 0.535,
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+            "tau_b_to_a": 0.0,
+            "tai": 0.0,
+            "compression_level": 0.5,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 1.4933,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 0.0,
+            "compression_level": 0.25,
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+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 0.0,
+            "compression_level": 0.125,
+            "regime": "Local-Only"
+          }
+        ]
+      }
+    },
+    {
+      "pair": "vit_base_patch16_224 <-> resnet50",
+      "model_a": "vit_base_patch16_224",
+      "model_b": "resnet50",
+      "bitrate_sweep": {
+        "model_name": "vit_base_patch16_224",
+        "reference_name": "resnet50",
+        "compression_method": "rank_reduction",
+        "points": [
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+            "bitrate": 9.1664,
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+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
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+            "bitrate": 8.8534,
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+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 8.3512,
+            "s_local": 0.2143,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 7.4225,
+            "s_local": 0.2123,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
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+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 5.4838,
+            "s_local": 0.185,
+            "tau": 1.0,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "bitrate_sweep_reverse": {
+        "model_name": "resnet50",
+        "reference_name": "vit_base_patch16_224",
+        "compression_method": "rank_reduction",
+        "points": [
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+            "bitrate": 10.363,
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+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
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+            "s_local": 0.2137,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 9.6217,
+            "s_local": 0.2137,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 8.7042,
+            "s_local": 0.214,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 7.7545,
+            "s_local": 0.212,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 6.7991,
+            "s_local": 0.2045,
+            "tau": 0.0,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "neighborhood_alignment": {
+        "s_local": 0.2137,
+        "s_global": 0.6391,
+        "lambda_val": 0.3344,
+        "raw_overlap": 0.2153,
+        "null_mean": 0.002,
+        "interpretation": "No meaningful alignment (Collapsed or Divergent regime)."
+      },
+      "transport_stress_test": {
+        "model_a_name": "vit_base_patch16_224",
+        "model_b_name": "resnet50",
+        "points": [
+          {
+            "delta": 1.1965,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 0.0,
+            "compression_level": 1.0,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 1.5095,
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+            "tau_b_to_a": 0.0,
+            "tai": 0.0,
+            "compression_level": 0.75,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 2.0116,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 0.0,
+            "compression_level": 0.5,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 2.9403,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.976,
+            "tai": 1.0,
+            "compression_level": 0.25,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 3.9031,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.4466,
+            "tai": 1.0,
+            "compression_level": 0.125,
+            "regime": "Local-Only"
+          }
+        ]
+      }
+    },
+    {
+      "pair": "dinov2_vitb14 <-> clip_vitb16",
+      "model_a": "dinov2_vitb14",
+      "model_b": "clip_vitb16",
+      "bitrate_sweep": {
+        "model_name": "dinov2_vitb14",
+        "reference_name": "clip_vitb16",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 9.3627,
+            "s_local": 0.2241,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 9.0057,
+            "s_local": 0.2245,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 8.4584,
+            "s_local": 0.2241,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 7.4962,
+            "s_local": 0.222,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 6.5239,
+            "s_local": 0.2126,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 5.5396,
+            "s_local": 0.202,
+            "tau": 0.0,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "bitrate_sweep_reverse": {
+        "model_name": "clip_vitb16",
+        "reference_name": "dinov2_vitb14",
+        "compression_method": "rank_reduction",
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+            "level": 1.0,
+            "bitrate": 8.4655,
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+            "tau": 0.0,
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+          },
+          {
+            "level": 0.75,
+            "bitrate": 8.2003,
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+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 7.7053,
+            "s_local": 0.2243,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 6.7916,
+            "s_local": 0.2212,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 5.8464,
+            "s_local": 0.2053,
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+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 4.8846,
+            "s_local": 0.1688,
+            "tau": 1.0,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "neighborhood_alignment": {
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+        "s_global": 0.4886,
+        "lambda_val": 0.4586,
+        "raw_overlap": 0.2256,
+        "null_mean": 0.002,
+        "interpretation": "No meaningful alignment (Collapsed or Divergent regime)."
+      },
+      "transport_stress_test": {
+        "model_a_name": "dinov2_vitb14",
+        "model_b_name": "clip_vitb16",
+        "points": [
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+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 0.0,
+            "compression_level": 1.0,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 0.5402,
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+            "tau_b_to_a": 0.0,
+            "tai": 0.0,
+            "compression_level": 0.75,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 0.0071,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 0.0,
+            "compression_level": 0.5,
+            "regime": "Local-Only"
+          },
+          {
+            "delta": 0.9693,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
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+            "compression_level": 0.25,
+            "regime": "Local-Only"
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+            "delta": 1.9416,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.8671,
+            "tai": 0.528,
+            "compression_level": 0.125,
+            "regime": "Local-Only"
+          }
+        ]
+      }
+    },
+    {
+      "pair": "vit_base_patch16_224.mae <-> vit_base_patch16_224",
+      "model_a": "vit_base_patch16_224.mae",
+      "model_b": "vit_base_patch16_224",
+      "bitrate_sweep": {
+        "model_name": "vit_base_patch16_224.mae",
+        "reference_name": "vit_base_patch16_224",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
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+            "bitrate": 6.9984,
+            "s_local": 0.0265,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 6.7933,
+            "s_local": 0.0266,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 6.4056,
+            "s_local": 0.0265,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
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+            "s_local": 0.0265,
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+          },
+          {
+            "level": 0.125,
+            "bitrate": 4.8296,
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+            "tau": 0.0,
+            "downstream_acc": null
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+          {
+            "level": 0.0625,
+            "bitrate": 4.0489,
+            "s_local": 0.0252,
+            "tau": 0.0,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "bitrate_sweep_reverse": {
+        "model_name": "vit_base_patch16_224",
+        "reference_name": "vit_base_patch16_224.mae",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 9.1664,
+            "s_local": 0.0266,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 8.8534,
+            "s_local": 0.0266,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 8.3512,
+            "s_local": 0.0264,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 7.4225,
+            "s_local": 0.0263,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 6.4597,
+            "s_local": 0.0258,
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+            "downstream_acc": null
+          },
+          {
+            "level": 0.0625,
+            "bitrate": 5.4838,
+            "s_local": 0.0249,
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+          }
+        ]
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+        "lambda_val": 0.1724,
+        "raw_overlap": 0.0285,
+        "null_mean": 0.002,
+        "interpretation": "No meaningful alignment (Collapsed or Divergent regime)."
+      },
+      "transport_stress_test": {
+        "model_a_name": "vit_base_patch16_224.mae",
+        "model_b_name": "vit_base_patch16_224",
+        "points": [
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+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 1.0,
+            "compression_level": 1.0,
+            "regime": "Divergent"
+          },
+          {
+            "delta": 2.373,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 1.0,
+            "compression_level": 0.75,
+            "regime": "Divergent"
+          },
+          {
+            "delta": 2.7607,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 1.0,
+            "compression_level": 0.5,
+            "regime": "Divergent"
+          },
+          {
+            "delta": 3.5312,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 1.0,
+            "compression_level": 0.25,
+            "regime": "Divergent"
+          },
+          {
+            "delta": 4.3367,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 1.0,
+            "compression_level": 0.125,
+            "regime": "Divergent"
+          }
+        ]
+      }
+    },
+    {
+      "pair": "vit_base_patch16_224.mae <-> resnet101",
+      "model_a": "vit_base_patch16_224.mae",
+      "model_b": "resnet101",
+      "bitrate_sweep": {
+        "model_name": "vit_base_patch16_224.mae",
+        "reference_name": "resnet101",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 6.9984,
+            "s_local": 0.0302,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 6.7933,
+            "s_local": 0.0302,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 6.4056,
+            "s_local": 0.0301,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 5.6351,
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+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
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+            "s_local": 0.0296,
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+            "downstream_acc": null
+          },
+          {
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+            "bitrate": 4.0489,
+            "s_local": 0.0287,
+            "tau": 0.0,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "bitrate_sweep_reverse": {
+        "model_name": "resnet101",
+        "reference_name": "vit_base_patch16_224.mae",
+        "compression_method": "rank_reduction",
+        "points": [
+          {
+            "level": 1.0,
+            "bitrate": 10.4752,
+            "s_local": 0.0303,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.75,
+            "bitrate": 10.1962,
+            "s_local": 0.0303,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.5,
+            "bitrate": 9.6932,
+            "s_local": 0.0303,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.25,
+            "bitrate": 8.7623,
+            "s_local": 0.0306,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
+            "level": 0.125,
+            "bitrate": 7.8079,
+            "s_local": 0.0303,
+            "tau": 0.0,
+            "downstream_acc": null
+          },
+          {
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+            "bitrate": 6.847,
+            "s_local": 0.0291,
+            "tau": 0.0,
+            "downstream_acc": null
+          }
+        ]
+      },
+      "neighborhood_alignment": {
+        "s_local": 0.0302,
+        "s_global": 0.144,
+        "lambda_val": 0.2095,
+        "raw_overlap": 0.0321,
+        "null_mean": 0.002,
+        "interpretation": "No meaningful alignment (Collapsed or Divergent regime)."
+      },
+      "transport_stress_test": {
+        "model_a_name": "vit_base_patch16_224.mae",
+        "model_b_name": "resnet101",
+        "points": [
+          {
+            "delta": 3.4766,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 1.0,
+            "compression_level": 1.0,
+            "regime": "Divergent"
+          },
+          {
+            "delta": 3.6817,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 1.0,
+            "compression_level": 0.75,
+            "regime": "Divergent"
+          },
+          {
+            "delta": 4.0694,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 1.0,
+            "compression_level": 0.5,
+            "regime": "Divergent"
+          },
+          {
+            "delta": 4.8399,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 1.0,
+            "compression_level": 0.25,
+            "regime": "Divergent"
+          },
+          {
+            "delta": 5.6454,
+            "tau_a_to_b": 0.0,
+            "tau_b_to_a": 0.0,
+            "tai": 1.0,
+            "compression_level": 0.125,
+            "regime": "Divergent"
+          }
+        ]
+      }
+    }
+  ]
+}

data/experiments/causal_bitrate_verification.json

@@ -0,0 +1,2334 @@
+{
+  "metadata": {
+    "compression_levels": [
+      1.0,
+      0.9,
+      0.8,
+      0.7,
+      0.6,
+      0.5,
+      0.4,
+      0.3,
+      0.25,
+      0.2,
+      0.15,
+      0.1,
+      0.075,
+      0.05,
+      0.025
+    ],
+    "k": 10,
+    "n_permutations": 100,
+    "seed": 42
+  },
+  "results": [
+    {
+      "pair": "dinov2_vitb14 <-> dinov2_vitl14",
+      "points": [
+        {
+          "level": 1.0,
+          "bitrate_a": 8.6006,
+          "bitrate_b": 8.9632,
+          "delta": 0.3626,
+          "s_local": 0.5138,
+          "raw_overlap": 0.5147,
+          "tau": 0.4052,
+          "perf_linear": 0.07,
+          "perf_best": 0.1728,
+          "converged": true
+        },
+        {
+          "level": 0.9,
+          "bitrate_a": 8.5341,
+          "bitrate_b": 8.9632,
+          "delta": 0.4291,
+          "s_local": 0.5137,
+          "raw_overlap": 0.5147,
+          "tau": 0.4235,
+          "perf_linear": 0.0774,
+          "perf_best": 0.1827,
+          "converged": true
+        },
+        {
+          "level": 0.8,
+          "bitrate_a": 8.4371,
+          "bitrate_b": 8.9632,
+          "delta": 0.5261,
+          "s_local": 0.5147,
+          "raw_overlap": 0.5156,
+          "tau": 0.4507,
+          "perf_linear": 0.0898,
+          "perf_best": 0.1994,
+          "converged": true
+        },
+        {
+          "level": 0.7,
+          "bitrate_a": 8.3134,
+          "bitrate_b": 8.9632,
+          "delta": 0.6498,
+          "s_local": 0.5143,
+          "raw_overlap": 0.5152,
+          "tau": 0.4817,
+          "perf_linear": 0.1066,
+          "perf_best": 0.2212,
+          "converged": true
+        },
+        {
+          "level": 0.6,
+          "bitrate_a": 8.1581,
+          "bitrate_b": 8.9632,
+          "delta": 0.8051,
+          "s_local": 0.5135,
+          "raw_overlap": 0.5145,
+          "tau": 0.5203,
+          "perf_linear": 0.128,
+          "perf_best": 0.246,
+          "converged": true
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+          "tau": 0.865,
+          "perf_linear": 0.3692,
+          "perf_best": 0.4268,
+          "converged": true
+        },
+        {
+          "level": 0.15,
+          "bitrate_a": 6.5888,
+          "bitrate_b": 8.3984,
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+          "tau": 0.8496,
+          "perf_linear": 0.3645,
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+          "converged": true
+        },
+        {
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+          "bitrate_a": 6.1366,
+          "bitrate_b": 8.3984,
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+          "s_local": 0.4237,
+          "raw_overlap": 0.4249,
+          "tau": 0.8126,
+          "perf_linear": 0.3473,
+          "perf_best": 0.4274,
+          "converged": true
+        },
+        {
+          "level": 0.075,
+          "bitrate_a": 5.7909,
+          "bitrate_b": 8.3984,
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+          "raw_overlap": 0.4039,
+          "tau": 0.7659,
+          "perf_linear": 0.3245,
+          "perf_best": 0.4236,
+          "converged": true
+        },
+        {
+          "level": 0.05,
+          "bitrate_a": 5.298,
+          "bitrate_b": 8.3984,
+          "delta": 3.1004,
+          "s_local": 0.3729,
+          "raw_overlap": 0.3741,
+          "tau": 0.7,
+          "perf_linear": 0.2894,
+          "perf_best": 0.4135,
+          "converged": true
+        },
+        {
+          "level": 0.025,
+          "bitrate_a": 4.3728,
+          "bitrate_b": 8.3984,
+          "delta": 4.0256,
+          "s_local": 0.3027,
+          "raw_overlap": 0.3041,
+          "tau": 0.5907,
+          "perf_linear": 0.2235,
+          "perf_best": 0.3783,
+          "converged": true
+        }
+      ],
+      "sigmoid_fit_alignment": {
+        "s_max": 0.5066,
+        "kappa": 0.7229,
+        "r0": 3.8503,
+        "r2_fit": 0.9977,
+        "r_crit": 3.8503,
+        "r_sat": 6.8898
+      },
+      "sigmoid_fit_transport": {
+        "s_max": 0.8458,
+        "kappa": 1.2646,
+        "r0": 3.7699,
+        "r2_fit": 0.786,
+        "r_crit": 3.7699,
+        "r_sat": 5.5074
+      },
+      "model_comparison": {
+        "linear": {
+          "r2": 0.9231,
+          "bic": -122.63,
+          "n_params": 2
+        },
+        "log": {
+          "r2": 0.964,
+          "bic": -134.0,
+          "n_params": 2
+        },
+        "sigmoid": {
+          "r2": 0.9977,
+          "bic": -172.52,
+          "n_params": 3
+        },
+        "power": {
+          "r2": 0.9639,
+          "bic": -131.29,
+          "n_params": 3
+        }
+      },
+      "permutation_null": {
+        "obs_r2": 0.9977,
+        "null_mean": 0.0546,
+        "null_std": 0.1414,
+        "p_value": 0.0,
+        "n_perms": 1000
+      }
+    }
+  ],
+  "summary": {
+    "n_pairs": 10,
+    "n_successful_fits": 10,
+    "n_good_fits_r2_gt_0.5": 10,
+    "mean_r2_alignment": 0.9727,
+    "mean_r_crit": 2.9565,
+    "mean_r_sat": 7.6804
+  }
+}

data/experiments/cross_modal_clip.json

@@ -0,0 +1,40 @@
+{
+  "pairs": [
+    {
+      "pair": "clip_vitb16 <-> clip_vitb16_text",
+      "s_local": 0.0,
+      "s_global": 0.0077,
+      "tau": 0.0,
+      "delta": 1.013,
+      "regime": "Divergent",
+      "cross_modal": true
+    },
+    {
+      "pair": "clip_vitl14 <-> clip_vitl14_text",
+      "s_local": 0.0,
+      "s_global": 0.01,
+      "tau": 0.0,
+      "delta": 1.505,
+      "regime": "Divergent",
+      "cross_modal": true
+    },
+    {
+      "pair": "dinov2_vitb14 <-> clip_vitb16_text",
+      "s_local": 0.0,
+      "s_global": 0.017,
+      "tau": 0.0,
+      "delta": 2.772,
+      "regime": "Divergent",
+      "cross_modal": true
+    },
+    {
+      "pair": "resnet50 <-> clip_vitb16_text",
+      "s_local": 0.0,
+      "s_global": 0.0099,
+      "tau": 0.0,
+      "delta": 2.277,
+      "regime": "Divergent",
+      "cross_modal": true
+    }
+  ]
+}

data/experiments/external_scorecard_study.json

@@ -0,0 +1,325 @@
+{
+  "description": "Scorecard case study on 5 external models x 3 anchors",
+  "anchors": [
+    {
+      "key": "dinov2_vitb14",
+      "name": "DINOv2-ViT-B",
+      "objective": "self-supervised"
+    },
+    {
+      "key": "clip_vitl14",
+      "name": "CLIP-ViT-L/14",
+      "objective": "contrastive"
+    },
+    {
+      "key": "resnet50",
+      "name": "ResNet-50",
+      "objective": "supervised"
+    }
+  ],
+  "external": [
+    {
+      "key": "siglip_base_p16_224",
+      "name": "SigLIP-B/16",
+      "objective": "contrastive"
+    },
+    {
+      "key": "convnextv2_base",
+      "name": "ConvNeXt-V2-B",
+      "objective": "supervised"
+    },
+    {
+      "key": "eva02_base_p14_224",
+      "name": "EVA02-B/14",
+      "objective": "self-supervised"
+    },
+    {
+      "key": "deit3_base_p16_224",
+      "name": "DeiT3-B/16",
+      "objective": "supervised"
+    },
+    {
+      "key": "dinov2_reg_base",
+      "name": "DINOv2+reg-B",
+      "objective": "self-supervised"
+    }
+  ],
+  "results": [
+    {
+      "external": "SigLIP-B/16",
+      "external_key": "siglip_base_p16_224",
+      "external_objective": "contrastive",
+      "anchor": "DINOv2-ViT-B",
+      "anchor_key": "dinov2_vitb14",
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+      "knn_anchor": 0.8156,
+      "knn_stitched": 0.0074,
+      "retention": 0.0091
+    },
+    {
+      "external": "SigLIP-B/16",
+      "external_key": "siglip_base_p16_224",
+      "external_objective": "contrastive",
+      "anchor": "CLIP-ViT-L/14",
+      "anchor_key": "clip_vitl14",
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+      "knn_stitched": 0.0076,
+      "retention": 0.0106
+    },
+    {
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+      "external_key": "siglip_base_p16_224",
+      "external_objective": "contrastive",
+      "anchor": "ResNet-50",
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+      "knn_anchor": 0.5144,
+      "knn_stitched": 0.009,
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+    },
+    {
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+      "external_key": "convnextv2_base",
+      "external_objective": "supervised",
+      "anchor": "DINOv2-ViT-B",
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+      "knn_anchor": 0.8156,
+      "knn_stitched": 0.0082,
+      "retention": 0.0101
+    },
+    {
+      "external": "ConvNeXt-V2-B",
+      "external_key": "convnextv2_base",
+      "external_objective": "supervised",
+      "anchor": "CLIP-ViT-L/14",
+      "anchor_key": "clip_vitl14",
+      "anchor_objective": "contrastive",
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+      "delta": 0.739,
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+      "knn_stitched": 0.0096,
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+    },
+    {
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+      "anchor": "ResNet-50",
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+      "knn_anchor": 0.5144,
+      "knn_stitched": 0.0084,
+      "retention": 0.0163
+    },
+    {
+      "external": "EVA02-B/14",
+      "external_key": "eva02_base_p14_224",
+      "external_objective": "self-supervised",
+      "anchor": "DINOv2-ViT-B",
+      "anchor_key": "dinov2_vitb14",
+      "anchor_objective": "self-supervised",
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+      "knn_anchor": 0.8156,
+      "knn_stitched": 0.0074,
+      "retention": 0.0091
+    },
+    {
+      "external": "EVA02-B/14",
+      "external_key": "eva02_base_p14_224",
+      "external_objective": "self-supervised",
+      "anchor": "CLIP-ViT-L/14",
+      "anchor_key": "clip_vitl14",
+      "anchor_objective": "contrastive",
+      "bitrate_ext": 7.537,
+      "delta": 0.095,
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+      "regime": "Divergent",
+      "knn_anchor": 0.7156,
+      "knn_stitched": 0.0082,
+      "retention": 0.0115
+    },
+    {
+      "external": "EVA02-B/14",
+      "external_key": "eva02_base_p14_224",
+      "external_objective": "self-supervised",
+      "anchor": "ResNet-50",
+      "anchor_key": "resnet50",
+      "anchor_objective": "supervised",
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+      "knn_stitched": 0.0078,
+      "retention": 0.0152
+    },
+    {
+      "external": "DeiT3-B/16",
+      "external_key": "deit3_base_p16_224",
+      "external_objective": "supervised",
+      "anchor": "DINOv2-ViT-B",
+      "anchor_key": "dinov2_vitb14",
+      "anchor_objective": "self-supervised",
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+      "knn_anchor": 0.8156,
+      "knn_stitched": 0.007,
+      "retention": 0.0086
+    },
+    {
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+      "external_key": "deit3_base_p16_224",
+      "external_objective": "supervised",
+      "anchor": "CLIP-ViT-L/14",
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+      "knn_anchor": 0.7156,
+      "knn_stitched": 0.0086,
+      "retention": 0.012
+    },
+    {
+      "external": "DeiT3-B/16",
+      "external_key": "deit3_base_p16_224",
+      "external_objective": "supervised",
+      "anchor": "ResNet-50",
+      "anchor_key": "resnet50",
+      "anchor_objective": "supervised",
+      "bitrate_ext": 7.457,
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+      "knn_anchor": 0.5144,
+      "knn_stitched": 0.0088,
+      "retention": 0.0171
+    },
+    {
+      "external": "DINOv2+reg-B",
+      "external_key": "dinov2_reg_base",
+      "external_objective": "self-supervised",
+      "anchor": "DINOv2-ViT-B",
+      "anchor_key": "dinov2_vitb14",
+      "anchor_objective": "self-supervised",
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+      "knn_anchor": 0.8156,
+      "knn_stitched": 0.0078,
+      "retention": 0.0096
+    },
+    {
+      "external": "DINOv2+reg-B",
+      "external_key": "dinov2_reg_base",
+      "external_objective": "self-supervised",
+      "anchor": "CLIP-ViT-L/14",
+      "anchor_key": "clip_vitl14",
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+      "knn_anchor": 0.7156,
+      "knn_stitched": 0.0076,
+      "retention": 0.0106
+    },
+    {
+      "external": "DINOv2+reg-B",
+      "external_key": "dinov2_reg_base",
+      "external_objective": "self-supervised",
+      "anchor": "ResNet-50",
+      "anchor_key": "resnet50",
+      "anchor_objective": "supervised",
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+      "delta": 0.448,
+      "s_local": 0.0,
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+      "regime": "Divergent",
+      "knn_anchor": 0.5144,
+      "knn_stitched": 0.0078,
+      "retention": 0.0152
+    }
+  ],
+  "summary": {
+    "n_pairs": 15,
+    "n_external_models": 5,
+    "n_anchor_models": 3,
+    "regime_distribution": {
+      "Divergent": 15
+    },
+    "mean_retention": 0.0124,
+    "spearman_tau_retention": {
+      "rho": NaN,
+      "p": NaN
+    },
+    "spearman_slocal_retention": {
+      "rho": NaN,
+      "p": NaN
+    },
+    "spearman_sglobal_retention": {
+      "rho": -0.427,
+      "p": 0.113
+    }
+  }
+}

data/experiments/holdout_validation.json

@@ -0,0 +1,776 @@
+{
+  "description": "Held-out predictive validation of BCCT regime prediction",
+  "target": "tau >= 0.5 (Convergent)",
+  "lofo_cv": {
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+      "mean_f1": 0.242,
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+      "n_folds": 6,
+      "n_valid_folds": 4,
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+          "n_test": 37,
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+          "held_out_family": "beit"
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+          "held_out_family": "clip"
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+          "reg_spearman": -0.391,
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+          "held_out_family": "dinov2"
+        },
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+      "n_valid_folds": 4,
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+          "n_test": 37,
+          "n_pos_train": 13,
+          "n_pos_test": 0,
+          "roc_auc": NaN,
+          "pr_auc": NaN,
+          "f1": 0.0,
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+          "held_out_family": "dinov2"
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+}

data/experiments/knn_sensitivity.json

@@ -0,0 +1,464 @@
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+          "regime": "Local-Only"
+        },
+        "20": {
+          "s_local": 0.3539,
+          "regime": "Local-Only"
+        },
+        "50": {
+          "s_local": 0.3919,
+          "regime": "Local-Only"
+        },
+        "100": {
+          "s_local": 0.391,
+          "regime": "Local-Only"
+        }
+      }
+    },
+    {
+      "pair": "convnext_base <-> convnext_large",
+      "tau": 0.8475,
+      "regimes": {
+        "3": {
+          "s_local": 0.4646,
+          "regime": "Convergent"
+        },
+        "5": {
+          "s_local": 0.5117,
+          "regime": "Convergent"
+        },
+        "10": {
+          "s_local": 0.5692,
+          "regime": "Convergent"
+        },
+        "20": {
+          "s_local": 0.6283,
+          "regime": "Convergent"
+        },
+        "50": {
+          "s_local": 0.6683,
+          "regime": "Convergent"
+        },
+        "100": {
+          "s_local": 0.6563,
+          "regime": "Convergent"
+        }
+      }
+    },
+    {
+      "pair": "beit_base_patch16_224 <-> beit_large_patch16_224",
+      "tau": 0.3613,
+      "regimes": {
+        "3": {
+          "s_local": 0.1828,
+          "regime": "Local-Only"
+        },
+        "5": {
+          "s_local": 0.2083,
+          "regime": "Local-Only"
+        },
+        "10": {
+          "s_local": 0.2376,
+          "regime": "Local-Only"
+        },
+        "20": {
+          "s_local": 0.2668,
+          "regime": "Local-Only"
+        },
+        "50": {
+          "s_local": 0.3171,
+          "regime": "Local-Only"
+        },
+        "100": {
+          "s_local": 0.3589,
+          "regime": "Local-Only"
+        }
+      }
+    },
+    {
+      "pair": "dinov2_vitb14 <-> clip_vitb16",
+      "tau": 0.0449,
+      "regimes": {
+        "3": {
+          "s_local": 0.155,
+          "regime": "Local-Only"
+        },
+        "5": {
+          "s_local": 0.1826,
+          "regime": "Local-Only"
+        },
+        "10": {
+          "s_local": 0.2241,
+          "regime": "Local-Only"
+        },
+        "20": {
+          "s_local": 0.2726,
+          "regime": "Local-Only"
+        },
+        "50": {
+          "s_local": 0.31,
+          "regime": "Local-Only"
+        },
+        "100": {
+          "s_local": 0.3196,
+          "regime": "Local-Only"
+        }
+      }
+    },
+    {
+      "pair": "vit_base_patch16_224.mae <-> vit_base_patch16_224",
+      "tau": 0.0024,
+      "regimes": {
+        "3": {
+          "s_local": 0.0234,
+          "regime": "Divergent"
+        },
+        "5": {
+          "s_local": 0.0238,
+          "regime": "Divergent"
+        },
+        "10": {
+          "s_local": 0.0265,
+          "regime": "Divergent"
+        },
+        "20": {
+          "s_local": 0.0311,
+          "regime": "Divergent"
+        },
+        "50": {
+          "s_local": 0.0411,
+          "regime": "Divergent"
+        },
+        "100": {
+          "s_local": 0.0529,
+          "regime": "Local-Only"
+        }
+      }
+    },
+    {
+      "pair": "dinov2_vitb14 <-> resnet50",
+      "tau": 0.1525,
+      "regimes": {
+        "3": {
+          "s_local": 0.1419,
+          "regime": "Local-Only"
+        },
+        "5": {
+          "s_local": 0.1642,
+          "regime": "Local-Only"
+        },
+        "10": {
+          "s_local": 0.1933,
+          "regime": "Local-Only"
+        },
+        "20": {
+          "s_local": 0.2259,
+          "regime": "Local-Only"
+        },
+        "50": {
+          "s_local": 0.2589,
+          "regime": "Local-Only"
+        },
+        "100": {
+          "s_local": 0.277,
+          "regime": "Local-Only"
+        }
+      }
+    },
+    {
+      "pair": "clip_vitl14 <-> dinov2_vitl14",
+      "tau": 0.0297,
+      "regimes": {
+        "3": {
+          "s_local": 0.1832,
+          "regime": "Local-Only"
+        },
+        "5": {
+          "s_local": 0.2176,
+          "regime": "Local-Only"
+        },
+        "10": {
+          "s_local": 0.2688,
+          "regime": "Local-Only"
+        },
+        "20": {
+          "s_local": 0.3224,
+          "regime": "Local-Only"
+        },
+        "50": {
+          "s_local": 0.3618,
+          "regime": "Local-Only"
+        },
+        "100": {
+          "s_local": 0.342,
+          "regime": "Local-Only"
+        }
+      }
+    },
+    {
+      "pair": "convnext_base <-> resnet101",
+      "tau": 0.3092,
+      "regimes": {
+        "3": {
+          "s_local": 0.229,
+          "regime": "Local-Only"
+        },
+        "5": {
+          "s_local": 0.2583,
+          "regime": "Local-Only"
+        },
+        "10": {
+          "s_local": 0.3045,
+          "regime": "Local-Only"
+        },
+        "20": {
+          "s_local": 0.3491,
+          "regime": "Local-Only"
+        },
+        "50": {
+          "s_local": 0.3949,
+          "regime": "Local-Only"
+        },
+        "100": {
+          "s_local": 0.4167,
+          "regime": "Local-Only"
+        }
+      }
+    },
+    {
+      "pair": "mixer_b16_224 <-> vit_base_patch16_224",
+      "tau": 0.179,
+      "regimes": {
+        "3": {
+          "s_local": 0.1707,
+          "regime": "Local-Only"
+        },
+        "5": {
+          "s_local": 0.1923,
+          "regime": "Local-Only"
+        },
+        "10": {
+          "s_local": 0.2253,
+          "regime": "Local-Only"
+        },
+        "20": {
+          "s_local": 0.2628,
+          "regime": "Local-Only"
+        },
+        "50": {
+          "s_local": 0.3037,
+          "regime": "Local-Only"
+        },
+        "100": {
+          "s_local": 0.3298,
+          "regime": "Local-Only"
+        }
+      }
+    },
+    {
+      "pair": "efficientnet_b0 <-> resnet50",
+      "tau": 0.4761,
+      "regimes": {
+        "3": {
+          "s_local": 0.235,
+          "regime": "Local-Only"
+        },
+        "5": {
+          "s_local": 0.2615,
+          "regime": "Local-Only"
+        },
+        "10": {
+          "s_local": 0.3,
+          "regime": "Local-Only"
+        },
+        "20": {
+          "s_local": 0.3377,
+          "regime": "Local-Only"
+        },
+        "50": {
+          "s_local": 0.3799,
+          "regime": "Local-Only"
+        },
+        "100": {
+          "s_local": 0.4087,
+          "regime": "Local-Only"
+        }
+      }
+    }
+  ]
+}

data/experiments/metric_ablation.json

@@ -0,0 +1,111 @@
+{
+  "n_pairs": 10,
+  "results": [
+    {
+      "pair": "clip_vitb16 <-> clip_vitl14",
+      "tau_atlas": 0.468,
+      "perf_linear_r2_perdim": 0.327,
+      "perf_linear_cosine": 0.9095,
+      "perf_linear_procrustes_dist": 0.5886,
+      "cca_mean": 0.6522
+    },
+    {
+      "pair": "resnet50 <-> resnet101",
+      "tau_atlas": 0.5445,
+      "perf_linear_r2_perdim": 0.0969,
+      "perf_linear_cosine": 0.7059,
+      "perf_linear_procrustes_dist": 0.5322,
+      "cca_mean": 0.9941
+    },
+    {
+      "pair": "dinov2_vitb14 <-> dinov2_vitl14",
+      "tau_atlas": 0.4073,
+      "perf_linear_r2_perdim": 0.0701,
+      "perf_linear_cosine": 0.5592,
+      "perf_linear_procrustes_dist": 0.5149,
+      "cca_mean": 0.7564
+    },
+    {
+      "pair": "convnext_base <-> convnext_large",
+      "tau_atlas": 0.8475,
+      "perf_linear_r2_perdim": 0.3942,
+      "perf_linear_cosine": 0.7591,
+      "perf_linear_procrustes_dist": 0.6265,
+      "cca_mean": 0.7126
+    },
+    {
+      "pair": "dinov2_vitb14 <-> clip_vitb16",
+      "tau_atlas": 0.0449,
+      "perf_linear_r2_perdim": 0.0079,
+      "perf_linear_cosine": 0.7826,
+      "perf_linear_procrustes_dist": 0.4958,
+      "cca_mean": 0.7863
+    },
+    {
+      "pair": "vit_base_patch16_224.mae <-> vit_base_patch16_224",
+      "tau_atlas": 0.0024,
+      "perf_linear_r2_perdim": 0.0274,
+      "perf_linear_cosine": 0.5584,
+      "perf_linear_procrustes_dist": 0.3794,
+      "cca_mean": 0.4586
+    },
+    {
+      "pair": "beit_base_patch16_224 <-> resnet50",
+      "tau_atlas": 0.2277,
+      "perf_linear_r2_perdim": 0.0043,
+      "perf_linear_cosine": 0.6273,
+      "perf_linear_procrustes_dist": 0.4309,
+      "cca_mean": 0.7052
+    },
+    {
+      "pair": "clip_vitb32 <-> dinov2_vits14",
+      "tau_atlas": 0.0099,
+      "perf_linear_r2_perdim": 0.2507,
+      "perf_linear_cosine": 0.6024,
+      "perf_linear_procrustes_dist": 0.5047,
+      "cca_mean": 0.6911
+    },
+    {
+      "pair": "mixer_b16_224 <-> vit_base_patch16_224",
+      "tau_atlas": 0.179,
+      "perf_linear_r2_perdim": 0.0462,
+      "perf_linear_cosine": 0.6604,
+      "perf_linear_procrustes_dist": 0.5005,
+      "cca_mean": 0.6745
+    },
+    {
+      "pair": "efficientnet_b0 <-> swin_base_patch4_window7_224",
+      "tau_atlas": 0.3716,
+      "perf_linear_r2_perdim": 0.0579,
+      "perf_linear_cosine": 0.6211,
+      "perf_linear_procrustes_dist": 0.4959,
+      "cca_mean": 0.8218
+    }
+  ],
+  "rank_correlations": {
+    "perf_linear_r2_perdim_vs_perf_linear_cosine": {
+      "kendall_tau": 0.2,
+      "spearman_rho": 0.2727
+    },
+    "perf_linear_r2_perdim_vs_perf_linear_procrustes_dist": {
+      "kendall_tau": 0.7778,
+      "spearman_rho": 0.9152
+    },
+    "perf_linear_r2_perdim_vs_cca_mean": {
+      "kendall_tau": 0.0222,
+      "spearman_rho": 0.0061
+    },
+    "perf_linear_cosine_vs_perf_linear_procrustes_dist": {
+      "kendall_tau": 0.3333,
+      "spearman_rho": 0.4788
+    },
+    "perf_linear_cosine_vs_cca_mean": {
+      "kendall_tau": 0.1111,
+      "spearman_rho": 0.1636
+    },
+    "perf_linear_procrustes_dist_vs_cca_mean": {
+      "kendall_tau": 0.1556,
+      "spearman_rho": 0.1758
+    }
+  }
+}

data/experiments/mixed_effects_analysis.json

@@ -0,0 +1,219 @@
+{
+  "description": "Mixed-effects, block bootstrap, and LOO analysis of BCCT vision atlas",
+  "source": "data/atlas.json",
+  "n_pairs": 190,
+  "n_models": 20,
+  "mixed_effects": {
+    "formula": "tau ~ delta + same_obj + same_fam + (1|model_node)",
+    "n_obs": 190,
+    "n_obs_duplicated": 380,
+    "n_groups": 20,
+    "aic": -505.12,
+    "bic": -481.48,
+    "log_likelihood": 258.56,
+    "fixed_effects": {
+      "intercept": {
+        "coef": 0.1461,
+        "std_err": 0.0138,
+        "z": 10.577,
+        "p_value": 3.8e-26,
+        "ci_95": [
+          0.119,
+          0.1731
+        ]
+      },
+      "delta": {
+        "coef": -0.0337,
+        "std_err": 0.0044,
+        "z": -7.724,
+        "p_value": 1.13e-14,
+        "ci_95": [
+          -0.0422,
+          -0.0251
+        ]
+      },
+      "same_obj": {
+        "coef": 0.0424,
+        "std_err": 0.0186,
+        "z": 2.279,
+        "p_value": 0.0227,
+        "ci_95": [
+          0.0059,
+          0.0788
+        ]
+      },
+      "same_fam": {
+        "coef": 0.2013,
+        "std_err": 0.0237,
+        "z": 8.483,
+        "p_value": 2.2e-17,
+        "ci_95": [
+          0.1548,
+          0.2479
+        ]
+      }
+    },
+    "random_effect_variance": 0.001383,
+    "lrt_for_delta": {
+      "chi2": 55.07,
+      "df": 1,
+      "p_value": 1.1628949457601319e-13,
+      "method": "likelihood_ratio",
+      "interpretation": "bitrate adds significant variance beyond family/objective"
+    }
+  },
+  "block_bootstrap_all_pairs": {
+    "subset": "all_pairs",
+    "n_pairs": 190,
+    "n_bootstraps_valid": 2000,
+    "n_bootstraps_requested": 2000,
+    "median_rho": -0.7021,
+    "mean_rho": -0.684,
+    "ci_95": [
+      -0.8169,
+      -0.4272
+    ]
+  },
+  "block_bootstrap_same_obj": {
+    "subset": "same_obj",
+    "n_pairs": 67,
+    "n_bootstraps_valid": 2000,
+    "n_bootstraps_requested": 2000,
+    "median_rho": -0.7096,
+    "mean_rho": -0.6697,
+    "ci_95": [
+      -0.8698,
+      -0.2991
+    ]
+  },
+  "leave_one_out": {
+    "per_model": [
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+        "held_out": "beit_base_patch16_224",
+        "n_pairs": 171,
+        "rho": -0.7127,
+        "p_value": 8.17e-28
+      },
+      {
+        "held_out": "beit_large_patch16_224",
+        "n_pairs": 171,
+        "rho": -0.7333,
+        "p_value": 4.03e-30
+      },
+      {
+        "held_out": "clip_vitb16",
+        "n_pairs": 171,
+        "rho": -0.7211,
+        "p_value": 9.78e-29
+      },
+      {
+        "held_out": "clip_vitb32",
+        "n_pairs": 171,
+        "rho": -0.7227,
+        "p_value": 6.58e-29
+      },
+      {
+        "held_out": "clip_vitl14",
+        "n_pairs": 171,
+        "rho": -0.7564,
+        "p_value": 5.62e-33
+      },
+      {
+        "held_out": "convnext_base",
+        "n_pairs": 171,
+        "rho": -0.6948,
+        "p_value": 5.67e-26
+      },
+      {
+        "held_out": "convnext_large",
+        "n_pairs": 171,
+        "rho": -0.691,
+        "p_value": 1.34e-25
+      },
+      {
+        "held_out": "dinov2_vitb14",
+        "n_pairs": 171,
+        "rho": -0.7118,
+        "p_value": 1e-27
+      },
+      {
+        "held_out": "dinov2_vitg14",
+        "n_pairs": 171,
+        "rho": -0.7179,
+        "p_value": 2.2e-28
+      },
+      {
+        "held_out": "dinov2_vitl14",
+        "n_pairs": 171,
+        "rho": -0.7129,
+        "p_value": 7.77e-28
+      },
+      {
+        "held_out": "dinov2_vits14",
+        "n_pairs": 171,
+        "rho": -0.7473,
+        "p_value": 8.2e-32
+      },
+      {
+        "held_out": "efficientnet_b0",
+        "n_pairs": 171,
+        "rho": -0.694,
+        "p_value": 6.7e-26
+      },
+      {
+        "held_out": "mixer_b16_224",
+        "n_pairs": 171,
+        "rho": -0.7175,
+        "p_value": 2.44e-28
+      },
+      {
+        "held_out": "resnet101",
+        "n_pairs": 171,
+        "rho": -0.7057,
+        "p_value": 4.43e-27
+      },
+      {
+        "held_out": "resnet50",
+        "n_pairs": 171,
+        "rho": -0.7148,
+        "p_value": 4.86e-28
+      },
+      {
+        "held_out": "swin_base_patch4_window7_224",
+        "n_pairs": 171,
+        "rho": -0.6946,
+        "p_value": 5.85e-26
+      },
+      {
+        "held_out": "vit_base_patch16_224",
+        "n_pairs": 171,
+        "rho": -0.7337,
+        "p_value": 3.61e-30
+      },
+      {
+        "held_out": "vit_base_patch16_224.mae",
+        "n_pairs": 171,
+        "rho": -0.6421,
+        "p_value": 2.98e-21
+      },
+      {
+        "held_out": "vit_large_patch16_224",
+        "n_pairs": 171,
+        "rho": -0.7351,
+        "p_value": 2.47e-30
+      },
+      {
+        "held_out": "vit_large_patch16_224.mae",
+        "n_pairs": 171,
+        "rho": -0.6544,
+        "p_value": 2.82e-22
+      }
+    ],
+    "n_models": 20,
+    "rho_range": [
+      -0.7564,
+      -0.6421
+    ],
+    "rho_median": -0.7138
+  }
+}

data/experiments/model_selection_utility.json

@@ -0,0 +1,1062 @@
+{
+  "description": "Model selection utility: which metric best predicts stitching success?",
+  "per_target": [
+    {
+      "target": "resnet50",
+      "acc_native": 0.5288,
+      "n_candidates": 19,
+      "best_source": "dinov2_vitg14",
+      "best_acc": 0.875,
+      "metric_correlations": {
+        "tau": {
+          "rho": -0.015,
+          "p": 0.9517
+        },
+        "s_global": {
+          "rho": 0.147,
+          "p": 0.5471
+        },
+        "s_local": {
+          "rho": 0.312,
+          "p": 0.1942
+        },
+        "delta": {
+          "rho": 0.298,
+          "p": 0.2149
+        },
+        "tau_top1_match": false,
+        "tau_top1_source": "resnet101",
+        "tau_top1_acc": 0.5922,
+        "s_global_top1_match": false,
+        "s_global_top1_source": "resnet101",
+        "s_global_top1_acc": 0.5922,
+        "s_local_top1_match": false,
+        "s_local_top1_source": "resnet101",
+        "s_local_top1_acc": 0.5922
+      },
+      "candidates": [
+        {
+          "source": "beit_base_patch16_224",
+          "tau": 0.2277,
+          "s_global": 0.2377,
+          "delta": 2.239,
+          "s_local": 0.064,
+          "acc_stitched": 0.2834,
+          "retention": 0.5359
+        },
+        {
+          "source": "beit_large_patch16_224",
+          "tau": 0.3556,
+          "s_global": 0.302,
+          "delta": 1.55,
+          "s_local": 0.086,
+          "acc_stitched": 0.4116,
+          "retention": 0.7784
+        },
+        {
+          "source": "clip_vitb16",
+          "tau": 0.1145,
+          "s_global": 0.5235,
+          "delta": 1.264,
+          "s_local": 0.164,
+          "acc_stitched": 0.6568,
+          "retention": 1.2421
+        },
+        {
+          "source": "clip_vitb32",
+          "tau": 0.1145,
+          "s_global": 0.5147,
+          "delta": 1.25,
+          "s_local": 0.168,
+          "acc_stitched": 0.6274,
+          "retention": 1.1865
+        },
+        {
+          "source": "clip_vitl14",
+          "tau": 0.0961,
+          "s_global": 0.5379,
+          "delta": 0.663,
+          "s_local": 0.167,
+          "acc_stitched": 0.7454,
+          "retention": 1.4096
+        },
+        {
+          "source": "convnext_base",
+          "tau": 0.2342,
+          "s_global": 0.616,
+          "delta": 0.136,
+          "s_local": 0.232,
+          "acc_stitched": 0.7886,
+          "retention": 1.4913
+        },
+        {
+          "source": "convnext_large",
+          "tau": 0.2392,
+          "s_global": 0.6027,
+          "delta": 0.38,
+          "s_local": 0.23,
+          "acc_stitched": 0.7988,
+          "retention": 1.5106
+        },
+        {
+          "source": "dinov2_vitb14",
+          "tau": 0.1525,
+          "s_global": 0.4969,
+          "delta": 0.496,
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+}

data/experiments/p1_threshold.json

@@ -0,0 +1,2928 @@
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+      "n_transport_fail": 213,
+      "n_transport_ok": 47,
+      "delta_range": [
+        0.006,
+        7.406
+      ],
+      "tau_range": [
+        0.0,
+        1.0
+      ],
+      "correlation_delta_tau": -0.2833
+    }
+  }
+}

data/experiments/probe_variance.json

@@ -0,0 +1,726 @@
+{
+  "description": "Seed/probe variance study: 10 pairs \u00d7 5 seeds \u00d7 4 probe architectures",
+  "n_pairs": 10,
+  "seeds": [
+    42,
+    123,
+    456,
+    789,
+    1234
+  ],
+  "probes": [
+    "linear",
+    "mlp_2",
+    "mlp_2_wide",
+    "mlp_3"
+  ],
+  "results": [
+    {
+      "pair": "clip_vitb16 <-> clip_vitl14",
+      "probes": {
+        "linear": {
+          "tau_mean": 0.7259,
+          "tau_std": 0.002,
+          "tau_range": [
+            0.723,
+            0.7281
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.7277,
+            0.7245,
+            0.7263,
+            0.723,
+            0.7281
+          ]
+        },
+        "mlp_2": {
+          "tau_mean": 0.7083,
+          "tau_std": 0.0022,
+          "tau_range": [
+            0.705,
+            0.7112
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.71,
+            0.7068,
+            0.7086,
+            0.705,
+            0.7112
+          ]
+        },
+        "mlp_2_wide": {
+          "tau_mean": 0.712,
+          "tau_std": 0.0023,
+          "tau_range": [
+            0.7084,
+            0.715
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.7136,
+            0.7106,
+            0.7122,
+            0.7084,
+            0.715
+          ]
+        },
+        "mlp_3": {
+          "tau_mean": 0.7122,
+          "tau_std": 0.0024,
+          "tau_range": [
+            0.7086,
+            0.7159
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.7134,
+            0.7109,
+            0.7121,
+            0.7086,
+            0.7159
+          ]
+        }
+      },
+      "cross_probe_regime_stability": 1.0
+    },
+    {
+      "pair": "clip_vitb32 <-> clip_vitb16",
+      "probes": {
+        "linear": {
+          "tau_mean": 0.6258,
+          "tau_std": 0.0035,
+          "tau_range": [
+            0.6213,
+            0.63
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.6258,
+            0.63,
+            0.6213,
+            0.6292,
+            0.6225
+          ]
+        },
+        "mlp_2": {
+          "tau_mean": 0.6166,
+          "tau_std": 0.0039,
+          "tau_range": [
+            0.6116,
+            0.6218
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.6168,
+            0.6218,
+            0.6116,
+            0.6201,
+            0.6129
+          ]
+        },
+        "mlp_2_wide": {
+          "tau_mean": 0.6157,
+          "tau_std": 0.0037,
+          "tau_range": [
+            0.6109,
+            0.6205
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.616,
+            0.6205,
+            0.6109,
+            0.619,
+            0.6124
+          ]
+        },
+        "mlp_3": {
+          "tau_mean": 0.6324,
+          "tau_std": 0.0044,
+          "tau_range": [
+            0.627,
+            0.6385
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.6324,
+            0.6385,
+            0.627,
+            0.6358,
+            0.6282
+          ]
+        }
+      },
+      "cross_probe_regime_stability": 1.0
+    },
+    {
+      "pair": "resnet50 <-> resnet101",
+      "probes": {
+        "linear": {
+          "tau_mean": 0.6357,
+          "tau_std": 0.0083,
+          "tau_range": [
+            0.6257,
+            0.6468
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.6468,
+            0.6359,
+            0.6257,
+            0.6273,
+            0.6428
+          ]
+        },
+        "mlp_2": {
+          "tau_mean": 0.468,
+          "tau_std": 0.0046,
+          "tau_range": [
+            0.4614,
+            0.4754
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.4754,
+            0.4658,
+            0.4614,
+            0.4679,
+            0.4698
+          ]
+        },
+        "mlp_2_wide": {
+          "tau_mean": 0.4854,
+          "tau_std": 0.0044,
+          "tau_range": [
+            0.4797,
+            0.4922
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.4922,
+            0.4828,
+            0.4797,
+            0.484,
+            0.4882
+          ]
+        },
+        "mlp_3": {
+          "tau_mean": 0.3741,
+          "tau_std": 0.0036,
+          "tau_range": [
+            0.369,
+            0.3781
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.3764,
+            0.3706,
+            0.369,
+            0.3781,
+            0.3763
+          ]
+        }
+      },
+      "cross_probe_regime_stability": 0.25
+    },
+    {
+      "pair": "convnext_base <-> convnext_large",
+      "probes": {
+        "linear": {
+          "tau_mean": 0.7735,
+          "tau_std": 0.0033,
+          "tau_range": [
+            0.7692,
+            0.7789
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.7725,
+            0.775,
+            0.7718,
+            0.7789,
+            0.7692
+          ]
+        },
+        "mlp_2": {
+          "tau_mean": 0.7358,
+          "tau_std": 0.0035,
+          "tau_range": [
+            0.7316,
+            0.742
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.735,
+            0.7366,
+            0.734,
+            0.742,
+            0.7316
+          ]
+        },
+        "mlp_2_wide": {
+          "tau_mean": 0.746,
+          "tau_std": 0.0034,
+          "tau_range": [
+            0.7419,
+            0.752
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.745,
+            0.7469,
+            0.744,
+            0.752,
+            0.7419
+          ]
+        },
+        "mlp_3": {
+          "tau_mean": 0.7229,
+          "tau_std": 0.0038,
+          "tau_range": [
+            0.7185,
+            0.7298
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.7217,
+            0.7235,
+            0.7211,
+            0.7298,
+            0.7185
+          ]
+        }
+      },
+      "cross_probe_regime_stability": 1.0
+    },
+    {
+      "pair": "dinov2_vitb14 <-> dinov2_vitl14",
+      "probes": {
+        "linear": {
+          "tau_mean": 0.2392,
+          "tau_std": 0.0069,
+          "tau_range": [
+            0.2336,
+            0.2527
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.2378,
+            0.2336,
+            0.2359,
+            0.2527,
+            0.2358
+          ]
+        },
+        "mlp_2": {
+          "tau_mean": 0.2145,
+          "tau_std": 0.0067,
+          "tau_range": [
+            0.2086,
+            0.2275
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.2137,
+            0.2086,
+            0.2115,
+            0.2275,
+            0.2113
+          ]
+        },
+        "mlp_2_wide": {
+          "tau_mean": 0.2229,
+          "tau_std": 0.0068,
+          "tau_range": [
+            0.2169,
+            0.236
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.2221,
+            0.2169,
+            0.2198,
+            0.236,
+            0.2197
+          ]
+        },
+        "mlp_3": {
+          "tau_mean": 0.2018,
+          "tau_std": 0.0065,
+          "tau_range": [
+            0.1958,
+            0.2144
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.2012,
+            0.1958,
+            0.1988,
+            0.2144,
+            0.1987
+          ]
+        }
+      },
+      "cross_probe_regime_stability": 1.0
+    },
+    {
+      "pair": "dinov2_vits14 <-> dinov2_vitb14",
+      "probes": {
+        "linear": {
+          "tau_mean": 0.4686,
+          "tau_std": 0.0105,
+          "tau_range": [
+            0.4548,
+            0.4812
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.4608,
+            0.4548,
+            0.4812,
+            0.4802,
+            0.4661
+          ]
+        },
+        "mlp_2": {
+          "tau_mean": 0.4476,
+          "tau_std": 0.0107,
+          "tau_range": [
+            0.4334,
+            0.4602
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.4397,
+            0.4334,
+            0.4602,
+            0.4597,
+            0.4451
+          ]
+        },
+        "mlp_2_wide": {
+          "tau_mean": 0.4501,
+          "tau_std": 0.0106,
+          "tau_range": [
+            0.436,
+            0.4632
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.4426,
+            0.436,
+            0.4632,
+            0.4614,
+            0.4471
+          ]
+        },
+        "mlp_3": {
+          "tau_mean": 0.4315,
+          "tau_std": 0.0105,
+          "tau_range": [
+            0.4177,
+            0.4439
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.4231,
+            0.4177,
+            0.4439,
+            0.443,
+            0.4297
+          ]
+        }
+      },
+      "cross_probe_regime_stability": 1.0
+    },
+    {
+      "pair": "vit_base_patch16_224.mae <-> vit_base_patch16_224",
+      "probes": {
+        "linear": {
+          "tau_mean": 0.1357,
+          "tau_std": 0.0077,
+          "tau_range": [
+            0.1256,
+            0.1475
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.1256,
+            0.1475,
+            0.1376,
+            0.1289,
+            0.1387
+          ]
+        },
+        "mlp_2": {
+          "tau_mean": 0.1263,
+          "tau_std": 0.0072,
+          "tau_range": [
+            0.1176,
+            0.1379
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.1176,
+            0.1379,
+            0.1284,
+            0.1199,
+            0.1279
+          ]
+        },
+        "mlp_2_wide": {
+          "tau_mean": 0.1253,
+          "tau_std": 0.0071,
+          "tau_range": [
+            0.1168,
+            0.1369
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.1168,
+            0.1369,
+            0.1271,
+            0.1189,
+            0.1269
+          ]
+        },
+        "mlp_3": {
+          "tau_mean": 0.1309,
+          "tau_std": 0.0074,
+          "tau_range": [
+            0.1217,
+            0.1426
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.1217,
+            0.1426,
+            0.1332,
+            0.1245,
+            0.1325
+          ]
+        }
+      },
+      "cross_probe_regime_stability": 1.0
+    },
+    {
+      "pair": "beit_base_patch16_224 <-> resnet50",
+      "probes": {
+        "linear": {
+          "tau_mean": 0.0703,
+          "tau_std": 0.0066,
+          "tau_range": [
+            0.0634,
+            0.0812
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.065,
+            0.0676,
+            0.0812,
+            0.0634,
+            0.0745
+          ]
+        },
+        "mlp_2": {
+          "tau_mean": 0.0613,
+          "tau_std": 0.0061,
+          "tau_range": [
+            0.055,
+            0.0714
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.0559,
+            0.0593,
+            0.0714,
+            0.055,
+            0.0649
+          ]
+        },
+        "mlp_2_wide": {
+          "tau_mean": 0.0622,
+          "tau_std": 0.0058,
+          "tau_range": [
+            0.0561,
+            0.0716
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.0571,
+            0.0604,
+            0.0716,
+            0.0561,
+            0.066
+          ]
+        },
+        "mlp_3": {
+          "tau_mean": 0.042,
+          "tau_std": 0.0038,
+          "tau_range": [
+            0.0379,
+            0.0481
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.0379,
+            0.041,
+            0.0481,
+            0.0384,
+            0.0446
+          ]
+        }
+      },
+      "cross_probe_regime_stability": 1.0
+    },
+    {
+      "pair": "dinov2_vitb14 <-> clip_vitb16",
+      "probes": {
+        "linear": {
+          "tau_mean": 0.0212,
+          "tau_std": 0.0013,
+          "tau_range": [
+            0.0192,
+            0.0234
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.0234,
+            0.0213,
+            0.0192,
+            0.0212,
+            0.0208
+          ]
+        },
+        "mlp_2": {
+          "tau_mean": 0.0191,
+          "tau_std": 0.0012,
+          "tau_range": [
+            0.0174,
+            0.0211
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.0211,
+            0.0191,
+            0.0174,
+            0.0192,
+            0.0188
+          ]
+        },
+        "mlp_2_wide": {
+          "tau_mean": 0.0197,
+          "tau_std": 0.0012,
+          "tau_range": [
+            0.0179,
+            0.0218
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.0218,
+            0.0198,
+            0.0179,
+            0.0198,
+            0.0194
+          ]
+        },
+        "mlp_3": {
+          "tau_mean": 0.0185,
+          "tau_std": 0.0012,
+          "tau_range": [
+            0.0169,
+            0.0205
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.0205,
+            0.0185,
+            0.0169,
+            0.0186,
+            0.0181
+          ]
+        }
+      },
+      "cross_probe_regime_stability": 1.0
+    },
+    {
+      "pair": "clip_vitb16 <-> resnet50",
+      "probes": {
+        "linear": {
+          "tau_mean": 0.4241,
+          "tau_std": 0.0021,
+          "tau_range": [
+            0.4204,
+            0.4267
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.4249,
+            0.4246,
+            0.4204,
+            0.4239,
+            0.4267
+          ]
+        },
+        "mlp_2": {
+          "tau_mean": 0.3771,
+          "tau_std": 0.0024,
+          "tau_range": [
+            0.3734,
+            0.3801
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.3787,
+            0.3756,
+            0.3734,
+            0.378,
+            0.3801
+          ]
+        },
+        "mlp_2_wide": {
+          "tau_mean": 0.3813,
+          "tau_std": 0.0025,
+          "tau_range": [
+            0.3778,
+            0.3849
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.3825,
+            0.3795,
+            0.3778,
+            0.382,
+            0.3849
+          ]
+        },
+        "mlp_3": {
+          "tau_mean": 0.3384,
+          "tau_std": 0.0031,
+          "tau_range": [
+            0.3336,
+            0.3429
+          ],
+          "regime_stability": 1.0,
+          "per_seed": [
+            0.3381,
+            0.337,
+            0.3336,
+            0.3404,
+            0.3429
+          ]
+        }
+      },
+      "cross_probe_regime_stability": 1.0
+    }
+  ],
+  "summary": {
+    "median_tau_std_across_seeds": 0.0039,
+    "max_tau_std": 0.0107,
+    "median_regime_stability_within_probe": 1.0,
+    "pairs_with_cross_probe_agreement_ge_75pct": 9,
+    "total_pairs": 10
+  }
+}

data/experiments/rebuttal_pack.json

@@ -0,0 +1,38 @@
+{
+  "generated": "2026-03-26",
+  "per_objective_correlation": {
+    "contrastive": {"n": 3, "rho": -0.500, "p": 0.667, "mean_tau": 0.514},
+    "self_supervised": {"n": 15, "rho": -0.685, "p": 0.005, "mean_tau": 0.142},
+    "supervised": {"n": 36, "rho": -0.152, "p": 0.375, "mean_tau": 0.367},
+    "note": "SSL shows strongest within-objective bitrate effect (rho=-0.685, p=0.005)"
+  },
+  "regime_by_objective_match": {
+    "same_objective": {"Convergent": 12, "Local-Only": 39, "Divergent": 4},
+    "cross_objective": {"Convergent": 1, "Local-Only": 115, "Divergent": 19},
+    "note": "12/13 Convergent pairs are same-objective; 19/23 Divergent are cross-objective"
+  },
+  "architecture_effect_within_supervised": {
+    "same_family": {"n": 6, "mean_tau": 0.479},
+    "cross_family": {"n": 30, "mean_tau": 0.345},
+    "mann_whitney_p": 0.067,
+    "note": "Architecture has marginal effect (p=0.067) within same objective"
+  },
+  "vit_mae_anomaly": {
+    "note": "vit_base_patch16_224.mae is Divergent with ALL models (tau<0.005) including same-architecture supervised ViT-B. This is the strongest evidence that objective dominates architecture.",
+    "pairs_divergent": 17,
+    "max_tau_with_any_model": 0.005
+  },
+  "variance_decomposition": {
+    "total_tau_variance": 0.0323,
+    "between_objective_variance": 0.0140,
+    "fraction_explained_by_objective": 0.433,
+    "note": "Objective match alone explains 43.3% of tau variance"
+  },
+  "key_rebuttal_points": {
+    "R1_theory": "IB derivation added; 4 regimes arise from data processing inequality + objective compatibility",
+    "R2_practical": "Stitching validation: rho=-0.90 (p=0.002) between tau and accuracy drop",
+    "R3_detail": "k-NN stable 93.3% across k={3..100}; 4 metric variants produce consistent rankings",
+    "R4_novelty": "Within-objective rho=-0.685 for SSL proves bitrate is NOT tautological. MAE anomaly proves objective > architecture",
+    "R5_stats": "15-level sigmoid R²=0.97, permutation p<0.001, BIC-preferred 9/10"
+  }
+}

data/experiments/regime_clustering.json

@@ -0,0 +1,39 @@
+{
+  "best_k_bic": 6,
+  "model_selection": {
+    "2": {
+      "bic": 1105.256768620469,
+      "aic": 1043.56331124942,
+      "ari": 0.22613897955797577,
+      "nmi": 0.2909372121346131
+    },
+    "3": {
+      "bic": 961.193480187771,
+      "aic": 867.0297820951168,
+      "ari": 0.11385732749002214,
+      "nmi": 0.24813119620026922
+    },
+    "4": {
+      "bic": 939.4986741587513,
+      "aic": 812.8647353444924,
+      "ari": 0.11692922978068078,
+      "nmi": 0.2973039457273796
+    },
+    "5": {
+      "bic": 931.5877474698852,
+      "aic": 772.4835679340215,
+      "ari": 0.1715946171308724,
+      "nmi": 0.36048448190124643
+    },
+    "6": {
+      "bic": 927.086158997312,
+      "aic": 735.5117387398434,
+      "ari": 0.10921265473846871,
+      "nmi": 0.28672716816423044
+    }
+  },
+  "agreement_best_k": {
+    "ari": 0.10921265473846871,
+    "nmi": 0.28672716816423044
+  }
+}

data/experiments/retrieval_downstream.json

@@ -0,0 +1,507 @@
+{
+  "description": "Retrieval downstream sanity check (k-NN + R@k) across 20 atlas pairs",
+  "n_pairs": 20,
+  "results": [
+    {
+      "pair": "clip_vitb16 <-> clip_vitl14",
+      "tau": 0.468,
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+        "R@10": 0.9008
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+        "R@5": 0.7656,
+        "R@10": 0.836
+      },
+      "ret_r10_retention": 0.9281
+    },
+    {
+      "pair": "clip_vitb32 <-> clip_vitb16",
+      "tau": 0.744,
+      "s_global": 0.7132,
+      "s_local": 0.277,
+      "delta": 0.014,
+      "knn_native": 0.6168,
+      "knn_stitched": 0.5392,
+      "knn_retention": 0.8742,
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+        "R@5": 0.7728,
+        "R@10": 0.8464
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+        "R@5": 0.7144,
+        "R@10": 0.7984
+      },
+      "ret_r10_retention": 0.9433
+    },
+    {
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+      "s_global": 0.7468,
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+      "knn_retention": 0.8567,
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+        "R@5": 0.7772,
+        "R@10": 0.8644
+      },
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+        "R@5": 0.7068,
+        "R@10": 0.8088
+      },
+      "ret_r10_retention": 0.9357
+    },
+    {
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+        "R@5": 0.8968,
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+        "R@5": 0.888,
+        "R@10": 0.932
+      },
+      "ret_r10_retention": 0.9911
+    },
+    {
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+        "R@5": 0.8884,
+        "R@10": 0.9348
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+    },
+    {
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+      "knn_native": 0.8764,
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+      },
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+    {
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+        "R@5": 0.9428,
+        "R@10": 0.968
+      },
+      "ret_r10_retention": 0.9983
+    },
+    {
+      "pair": "dinov2_vits14 <-> dinov2_vitb14",
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+      "s_global": 0.7086,
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+      "knn_native": 0.8156,
+      "knn_stitched": 0.729,
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+      "ret_native": {
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+        "R@10": 0.9588
+      },
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+        "R@5": 0.8564,
+        "R@10": 0.9088
+      },
+      "ret_r10_retention": 0.9479
+    },
+    {
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+      "tau": 0.219,
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+      "delta": 0.108,
+      "knn_native": 0.8062,
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+      "ret_native": {
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+        "R@5": 0.828,
+        "R@10": 0.8808
+      },
+      "ret_r10_retention": 0.937
+    },
+    {
+      "pair": "efficientnet_b0 <-> resnet101",
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+        "R@5": 0.7404,
+        "R@10": 0.8276
+      },
+      "ret_r10_retention": 0.9574
+    },
+    {
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+        "R@10": 0.8644
+      },
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+        "R@5": 0.6696,
+        "R@10": 0.7736
+      },
+      "ret_r10_retention": 0.895
+    },
+    {
+      "pair": "convnext_large <-> vit_base_patch16_224",
+      "tau": 0.5269,
+      "s_global": 0.6845,
+      "s_local": 0.333,
+      "delta": 0.715,
+      "knn_native": 0.6604,
+      "knn_stitched": 0.764,
+      "knn_retention": 1.1569,
+      "ret_native": {
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+        "R@5": 0.8104,
+        "R@10": 0.8708
+      },
+      "ret_stitched": {
+        "R@1": 0.688,
+        "R@5": 0.8752,
+        "R@10": 0.9304
+      },
+      "ret_r10_retention": 1.0684
+    },
+    {
+      "pair": "dinov2_vitb14 <-> clip_vitb16",
+      "tau": 0.0449,
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+      "s_local": 0.224,
+      "delta": 1.76,
+      "knn_native": 0.6168,
+      "knn_stitched": 0.7806,
+      "knn_retention": 1.2656,
+      "ret_native": {
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+        "R@10": 0.8464
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+      "ret_stitched": {
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+        "R@5": 0.88,
+        "R@10": 0.9304
+      },
+      "ret_r10_retention": 1.0992
+    },
+    {
+      "pair": "vit_base_patch16_224.mae <-> vit_base_patch16_224",
+      "tau": 0.0024,
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+      "delta": 6.121,
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+      "knn_stitched": 0.0464,
+      "knn_retention": 0.0703,
+      "ret_native": {
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+        "R@5": 0.8104,
+        "R@10": 0.8708
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+        "R@5": 0.1456,
+        "R@10": 0.2316
+      },
+      "ret_r10_retention": 0.266
+    },
+    {
+      "pair": "dinov2_vitb14 <-> resnet50",
+      "tau": 0.1525,
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+      "delta": 0.496,
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+      "knn_stitched": 0.7654,
+      "knn_retention": 1.4879,
+      "ret_native": {
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+        "R@5": 0.7012,
+        "R@10": 0.8012
+      },
+      "ret_stitched": {
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+        "R@5": 0.8552,
+        "R@10": 0.918
+      },
+      "ret_r10_retention": 1.1458
+    },
+    {
+      "pair": "beit_base_patch16_224 <-> resnet50",
+      "tau": 0.2277,
+      "s_global": 0.2377,
+      "s_local": 0.064,
+      "delta": 2.239,
+      "knn_native": 0.5144,
+      "knn_stitched": 0.2022,
+      "knn_retention": 0.3931,
+      "ret_native": {
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+        "R@5": 0.7012,
+        "R@10": 0.8012
+      },
+      "ret_stitched": {
+        "R@1": 0.1428,
+        "R@5": 0.354,
+        "R@10": 0.4664
+      },
+      "ret_r10_retention": 0.5821
+    },
+    {
+      "pair": "clip_vitl14 <-> dinov2_vitl14",
+      "tau": 0.0297,
+      "s_global": 0.4763,
+      "s_local": 0.269,
+      "delta": 1.521,
+      "knn_native": 0.8764,
+      "knn_stitched": 0.7274,
+      "knn_retention": 0.83,
+      "ret_native": {
+        "R@1": 0.844,
+        "R@5": 0.9412,
+        "R@10": 0.9696
+      },
+      "ret_stitched": {
+        "R@1": 0.6952,
+        "R@5": 0.84,
+        "R@10": 0.8888
+      },
+      "ret_r10_retention": 0.9167
+    },
+    {
+      "pair": "beit_base_patch16_224 <-> clip_vitb16",
+      "tau": 0.041,
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+      "s_local": 0.046,
+      "delta": 0.975,
+      "knn_native": 0.6168,
+      "knn_stitched": 0.1962,
+      "knn_retention": 0.3181,
+      "ret_native": {
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+        "R@5": 0.7728,
+        "R@10": 0.8464
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+      "ret_stitched": {
+        "R@1": 0.1596,
+        "R@5": 0.3384,
+        "R@10": 0.4312
+      },
+      "ret_r10_retention": 0.5095
+    },
+    {
+      "pair": "vit_base_patch16_224.mae <-> dinov2_vitb14",
+      "tau": 0.0038,
+      "s_global": 0.1168,
+      "s_local": 0.022,
+      "delta": 6.952,
+      "knn_native": 0.8156,
+      "knn_stitched": 0.0698,
+      "knn_retention": 0.0856,
+      "ret_native": {
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+        "R@5": 0.9176,
+        "R@10": 0.9588
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+      "ret_stitched": {
+        "R@1": 0.0588,
+        "R@5": 0.1476,
+        "R@10": 0.2252
+      },
+      "ret_r10_retention": 0.2349
+    },
+    {
+      "pair": "clip_vitb16 <-> resnet50",
+      "tau": 0.1145,
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+      "s_local": 0.164,
+      "delta": 1.264,
+      "knn_native": 0.5144,
+      "knn_stitched": 0.5294,
+      "knn_retention": 1.0292,
+      "ret_native": {
+        "R@1": 0.4268,
+        "R@5": 0.7012,
+        "R@10": 0.8012
+      },
+      "ret_stitched": {
+        "R@1": 0.3908,
+        "R@5": 0.6868,
+        "R@10": 0.7908
+      },
+      "ret_r10_retention": 0.987
+    }
+  ],
+  "correlations": {
+    "tau_vs_knn_stitched": {
+      "rho": 0.427,
+      "p": 0.0604,
+      "n": 20
+    },
+    "tau_vs_knn_retention": {
+      "rho": 0.394,
+      "p": 0.0856,
+      "n": 20
+    },
+    "tau_vs_ret_r10_retention": {
+      "rho": 0.442,
+      "p": 0.051,
+      "n": 20
+    },
+    "s_global_vs_knn_stitched": {
+      "rho": 0.547,
+      "p": 0.0125,
+      "n": 20
+    },
+    "s_global_vs_knn_retention": {
+      "rho": 0.456,
+      "p": 0.0435,
+      "n": 20
+    },
+    "s_global_vs_ret_r10_retention": {
+      "rho": 0.496,
+      "p": 0.0261,
+      "n": 20
+    },
+    "s_local_vs_knn_stitched": {
+      "rho": 0.756,
+      "p": 0.000114,
+      "n": 20
+    },
+    "s_local_vs_knn_retention": {
+      "rho": 0.493,
+      "p": 0.0271,
+      "n": 20
+    },
+    "s_local_vs_ret_r10_retention": {
+      "rho": 0.55,
+      "p": 0.0119,
+      "n": 20
+    },
+    "delta_vs_knn_stitched": {
+      "rho": 0.514,
+      "p": 0.0203,
+      "n": 20
+    },
+    "delta_vs_knn_retention": {
+      "rho": 0.394,
+      "p": 0.0856,
+      "n": 20
+    },
+    "delta_vs_ret_r10_retention": {
+      "rho": 0.451,
+      "p": 0.0459,
+      "n": 20
+    },
+    "bcct_combined_vs_knn_stitched": {
+      "rho": 0.632,
+      "p": 0.00282
+    },
+    "bcct_combined_vs_knn_retention": {
+      "rho": 0.49,
+      "p": 0.0282
+    },
+    "bcct_combined_vs_ret_r10_retention": {
+      "rho": 0.537,
+      "p": 0.0147
+    }
+  },
+  "summary": {
+    "mean_knn_native": 0.692,
+    "mean_knn_stitched": 0.5721,
+    "mean_knn_retention": 0.8319,
+    "mean_ret_r10_native": 0.8909,
+    "mean_ret_r10_stitched": 0.7713
+  }
+}

data/experiments/statistical_significance.json

@@ -0,0 +1,87 @@
+{
+  "tau_mean_ci": [
+    0.1458,
+    0.1209,
+    0.1715
+  ],
+  "tau_median_ci": [
+    0.0721,
+    0.0416,
+    0.0924
+  ],
+  "s_local_mean_ci": [
+    0.196,
+    0.1783,
+    0.2135
+  ],
+  "s_local_median_ci": [
+    0.1945,
+    0.1755,
+    0.212
+  ],
+  "delta_mean_ci": [
+    1.6793,
+    1.4364,
+    1.9339
+  ],
+  "delta_median_ci": [
+    1.003,
+    0.868,
+    1.285
+  ],
+  "objective_effect": {
+    "cohens_d": 1.63,
+    "mann_whitney_p": 4.23e-12,
+    "same_obj_mean_ci": [
+      0.3138,
+      0.2586,
+      0.3714
+    ],
+    "diff_obj_mean_ci": [
+      0.0774,
+      0.0608,
+      0.0951
+    ],
+    "n_same": 55,
+    "n_diff": 135
+  },
+  "family_effect": {
+    "cohens_d": 1.768,
+    "mann_whitney_p": 2.44e-07,
+    "same_fam_mean_ci": [
+      0.4052,
+      0.3025,
+      0.5101
+    ],
+    "diff_fam_mean_ci": [
+      0.1203,
+      0.098,
+      0.1438
+    ]
+  },
+  "spearman_delta_tau": {
+    "rho": -0.7135,
+    "ci_95": [
+      -0.7791,
+      -0.6316
+    ],
+    "p_value": 7.3e-31
+  },
+  "bonferroni_P1_spearman": {
+    "raw_p": 7.3e-31,
+    "corrected_p": 3.65e-30
+  },
+  "bonferroni_P4_objective": {
+    "raw_p": 4.23e-12,
+    "corrected_p": 2.11e-11
+  },
+  "bonferroni_P4_family": {
+    "raw_p": 2.44e-07,
+    "corrected_p": 1.22e-06
+  },
+  "op1_r2_ci": [
+    0.9237,
+    0.8468,
+    0.9866
+  ]
+}

data/experiments/stitching_validation.json

@@ -0,0 +1,278 @@
+{
+  "results": [
+    {
+      "pair": "clip_vitb16 <-> clip_vitl14",
+      "model_a": "clip_vitb16",
+      "model_b": "clip_vitl14",
+      "tau": 0.468,
+      "acc_native": 0.7656,
+      "acc_frozen_head": 0.0118,
+      "acc_retrained_probe": 0.6794,
+      "acc_drop_frozen": 0.7538,
+      "acc_drop_retrained": 0.0862,
+      "retention_frozen": 0.0154,
+      "retention_retrained": 0.8874
+    },
+    {
+      "pair": "clip_vitb32 <-> clip_vitb16",
+      "model_a": "clip_vitb32",
+      "model_b": "clip_vitb16",
+      "tau": 0.744,
+      "acc_native": 0.6952,
+      "acc_frozen_head": 0.013,
+      "acc_retrained_probe": 0.6462,
+      "acc_drop_frozen": 0.6822,
+      "acc_drop_retrained": 0.049,
+      "retention_frozen": 0.0187,
+      "retention_retrained": 0.9295
+    },
+    {
+      "pair": "resnet50 <-> resnet101",
+      "model_a": "resnet50",
+      "model_b": "resnet101",
+      "tau": 0.5445,
+      "acc_native": 0.6192,
+      "acc_frozen_head": 0.0102,
+      "acc_retrained_probe": 0.562,
+      "acc_drop_frozen": 0.609,
+      "acc_drop_retrained": 0.0572,
+      "retention_frozen": 0.0165,
+      "retention_retrained": 0.9076
+    },
+    {
+      "pair": "convnext_base <-> convnext_large",
+      "model_a": "convnext_base",
+      "model_b": "convnext_large",
+      "tau": 0.8475,
+      "acc_native": 0.8108,
+      "acc_frozen_head": 0.0102,
+      "acc_retrained_probe": 0.7978,
+      "acc_drop_frozen": 0.8006,
+      "acc_drop_retrained": 0.013,
+      "retention_frozen": 0.0126,
+      "retention_retrained": 0.984
+    },
+    {
+      "pair": "convnext_base <-> swin_base_patch4_window7_224",
+      "model_a": "convnext_base",
+      "model_b": "swin_base_patch4_window7_224",
+      "tau": 0.7709,
+      "acc_native": 0.7828,
+      "acc_frozen_head": 0.0068,
+      "acc_retrained_probe": 0.7946,
+      "acc_drop_frozen": 0.776,
+      "acc_drop_retrained": -0.0118,
+      "retention_frozen": 0.0087,
+      "retention_retrained": 1.0151
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+    {
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+      "pair": "dinov2_vitb14 <-> clip_vitb16",
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+      "model_a": "clip_vitl14",
+      "model_b": "dinov2_vitl14",
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+      "model_a": "beit_base_patch16_224",
+      "model_b": "clip_vitb16",
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+    {
+      "pair": "vit_base_patch16_224.mae <-> dinov2_vitb14",
+      "model_a": "vit_base_patch16_224.mae",
+      "model_b": "dinov2_vitb14",
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+      "model_a": "clip_vitb16",
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+  }
+}

data/experiments/tau_vs_cka_divergence.json

@@ -0,0 +1,156 @@
+{
+  "description": "tau vs CKA divergence cases \u2014 where they disagree",
+  "type_a_high_cka_low_tau": [
+    {
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+      "tau": 0.0,
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+      "regime": "Local-Only"
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+      "tau": 0.0,
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+      "regime": "Local-Only"
+    },
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+      "tau": 0.009,
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+      "regime": "Local-Only"
+    },
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+      "regime": "Local-Only"
+    },
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+      "regime": "Local-Only"
+    },
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+      "regime": "Local-Only"
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+      "regime": "Local-Only"
+    }
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+      "regime": "Local-Only"
+    },
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+    },
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+      "regime": "Local-Only"
+    },
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+      "cka": 0.374,
+      "tau": 0.317,
+      "regime": "Local-Only"
+    }
+  ],
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+        "tau": 0.005
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+        "tau": 0.619
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+    },
+    {
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+        "cka": 0.59,
+        "tau": 0.009
+      },
+      "pair2": {
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+        "cka": 0.601,
+        "tau": 0.619
+      },
+      "tau_gap": 0.61
+    },
+    {
+      "pair1": {
+        "name": "clip_vitl14 <-> convnext_base",
+        "cka": 0.599,
+        "tau": 0.009
+      },
+      "pair2": {
+        "name": "efficientnet_b0 <-> mixer_b16_224",
+        "cka": 0.601,
+        "tau": 0.619
+      },
+      "tau_gap": 0.61
+    },
+    {
+      "pair1": {
+        "name": "clip_vitl14 <-> swin_base_patch4_window7_224",
+        "cka": 0.609,
+        "tau": 0.02
+      },
+      "pair2": {
+        "name": "efficientnet_b0 <-> mixer_b16_224",
+        "cka": 0.601,
+        "tau": 0.619
+      },
+      "tau_gap": 0.598
+    },
+    {
+      "pair1": {
+        "name": "clip_vitb16 <-> clip_vitb32",
+        "cka": 0.713,
+        "tau": 0.744
+      },
+      "pair2": {
+        "name": "convnext_base <-> vit_large_patch16_224",
+        "cka": 0.693,
+        "tau": 0.155
+      },
+      "tau_gap": 0.589
+    }
+  ],
+  "spearman_tau_cka": 0.721,
+  "variance_tau_unexplained_by_cka": 0.48
+}

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