Chungulus/Qwen3.8-27B-EXL3

Qwen3.8-27B EXL3

This repository is a quantized deployment variant of the official Qwen/Qwen3.8-27B model. It is not a fine-tune.

Provenance and configuration

• Exact parent revision: 1d4bf0f2ff6012fd82039f2fa52739d0dd7c60c0
• Quantizer: GPTQModel EXL3
• Quantizer revision: 7df3d1e837cb5552512bf99b8729c334d0b2c010
• Quantization configuration: {"bits": 4.0, "calibration_batch_size": 1, "calibration_corpus_sha256": "7ac4e3f0092bd5acfdeaec88f19a8c829458b0716c10ab9e81cda6f8b064b675", "calibration_samples": 128, "calibration_sequence_length": 2048, "calibration_sort": true, "checkpoint_format": "exl3", "codebook": "mcg", "desc_act": false, "format": "exl3", "group_size": -1, "head_bits": 6.0, "lm_head": false, "meta": {"auto_forward_data_parallel": true, "dense_vram_strategy": "exclusive", "dense_vram_strategy_devices": null, "fallback": {"smooth": null, "strategy": "rtn", "threshold": "0.5%"}, "gc_mode": "interval", "moe_vram_strategy": "exclusive", "moe_vram_strategy_devices": null, "offload_to_disk": false, "offload_to_disk_path": null, "pack_impl": "cpu", "wait_for_submodule_finalizers": false}, "method": "exl3", "out_scales": "auto", "pack_dtype": "int32", "quant_method": "exl3"}
• Artifact size: 17.798 GiB
• Supported runtime: GPTQModel 7.3.4+ / EXL3 CUDA kernel
• Tested hardware: NVIDIA GeForce RTX 4070 12 GB (Ada, SM89), WSL2 Ubuntu 24.04

Calibration and architecture handling

The calibration corpus is original CC0-1.0 material authored for this project. It contains 216 text/tool samples and 8 vision samples across prose, code, debugging, math, science, structured output, tools, multilingual, and long-context categories. This build used calibration/core.jsonl:128.

• Tensor exclusions: []
• Vision: True (deterministic image generation gate)
• Tool use: True (schema-valid XML tool-call gate)
• MTP: True for preservation of the 15 external tensors; no local speculative drafter/acceptance runtime is claimed.
• Processor/chat template: exact pinned-parent copy verified.

Numerical validation

Full-vocabulary held-out comparison used 512 token positions.

Metric	Result
Mean KL	0.00759337
Median KL	0.00308530
P95 KL	0.02567411
Perplexity delta	-1.2346%
Top-1 agreement	0.943359
Top-5 set overlap	0.943359
Logit cosine similarity	0.99754137

Performance smoke

• Execution mode: RTX 4070 + CPU offload/auto map
• Device map summary: {"cpu": 51, "cuda:0": 17}
• Prompt/decode: 512 / 8 tokens
• Median TTFT: 45.4428 s
• Median prefill: 11.389 tok/s
• Median decode: 0.156 tok/s
• Cold/warm load: 62.684 / 50.418 s
• Peak physical device memory: 11.605 GiB
• PyTorch logical allocator peak (diagnostic, may exceed physical VRAM under WSL): 17.200 GiB
• Peak build RAM / VRAM: 17.469 / 10.123 GiB

Limitations

The RTX 4070 validation may use CPU offload and is not a pure-GPU throughput claim unless the performance mode explicitly says so. Preserved MTP weights do not establish speculative decoding support. Compatibility and quality are established only for the exact revision and runtime above. Machine-readable structural, generation, vision, tools, numerical, and performance reports are stored under validation/ in this repository. Remote verification evidence is retained by the build worker and tied to the exact repository revision.