Datasets:
Tasks:
Feature Extraction
Languages:
English
Size:
< 1K
Tags:
SAE
mechinterp
mechanistic-interpretability
sparse-autoencoders
monosemanticity
feature-extraction
License:
layer int64 0 5 | seed int64 0 0 | model_id stringclasses 1
value | d_in int64 576 576 | n_features int64 18.4k 18.4k | k int64 50 50 | batch_tokens int64 32.8k 32.8k | n_steps int64 4k 5k | lr float64 0 0 | lambda_l0 float64 0 0 | tier stringclasses 1
value | preflight dict | scheduler_mode stringclasses 1
value | scheduler_phase stringclasses 1
value | scheduler_phase_summary dict | scheduler_transitions int64 0 0 | total_tokens int64 131M 164M | early_stopped bool 2
classes | path stringclasses 1
value | best_ev float64 0.94 0.97 | best_ev_step int64 3.5k 4k | final_metrics dict | training_curve dict |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0 | 0 | HuggingFaceTB/SmolLM2-135M-Instruct | 576 | 18,432 | 50 | 32,768 | 5,000 | 0.0002 | 0.001025 | hot | {
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} | BASELINE | DESCENT | {
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1 | 0 | HuggingFaceTB/SmolLM2-135M-Instruct | 576 | 18,432 | 50 | 32,768 | 4,751 | 0.0002 | 0.001132 | hot | {
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2 | 0 | HuggingFaceTB/SmolLM2-135M-Instruct | 576 | 18,432 | 50 | 32,768 | 4,751 | 0.0002 | 0.000721 | hot | {
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3 | 0 | HuggingFaceTB/SmolLM2-135M-Instruct | 576 | 18,432 | 50 | 32,768 | 4,001 | 0.0002 | 0.001089 | hot | {
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4 | 0 | HuggingFaceTB/SmolLM2-135M-Instruct | 576 | 18,432 | 50 | 32,768 | 5,000 | 0.0002 | 0.001512 | hot | {
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5 | 0 | HuggingFaceTB/SmolLM2-135M-Instruct | 576 | 18,432 | 50 | 32,768 | 4,001 | 0.0002 | 0.001338 | hot | {
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5 | 0 | HuggingFaceTB/SmolLM2-135M-Instruct | 576 | 18,432 | 50 | 32,768 | 4,001 | 0.0002 | 0.001338 | hot | {
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5 | 0 | HuggingFaceTB/SmolLM2-135M-Instruct | 576 | 18,432 | 50 | 32,768 | 4,001 | 0.0002 | 0.001338 | hot | {
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5 | 0 | HuggingFaceTB/SmolLM2-135M-Instruct | 576 | 18,432 | 50 | 32,768 | 4,001 | 0.0002 | 0.001338 | hot | {
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5 | 0 | HuggingFaceTB/SmolLM2-135M-Instruct | 576 | 18,432 | 50 | 32,768 | 4,001 | 0.0002 | 0.001338 | hot | {
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5 | 0 | HuggingFaceTB/SmolLM2-135M-Instruct | 576 | 18,432 | 50 | 32,768 | 4,001 | 0.0002 | 0.001338 | hot | {
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5 | 0 | HuggingFaceTB/SmolLM2-135M-Instruct | 576 | 18,432 | 50 | 32,768 | 4,001 | 0.0002 | 0.001338 | hot | {
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5 | 0 | HuggingFaceTB/SmolLM2-135M-Instruct | 576 | 18,432 | 50 | 32,768 | 4,001 | 0.0002 | 0.001338 | hot | {
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} | BASELINE | DESCENT | {
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} | 0 | 131,104,768 | true | rolling | 0.938774 | 3,500 | {
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5 | 0 | HuggingFaceTB/SmolLM2-135M-Instruct | 576 | 18,432 | 50 | 32,768 | 4,001 | 0.0002 | 0.001338 | hot | {
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"phase_step": 4000,
"pin_entry_step": null,
"pinned_lambda": null,
"pin_ev_count": 0,
"pin_retry_count": 0
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"recon_loss": 1.160537,
"mean_l0": 47.57,
"dead_pct": 0,
"resampled": 0,
"ev": 0.9350036541075181,
"nonlinear_err": null,
"linear_err": null,
"activation_norm_probe": 4.198906421661377,
"activation_norm_ref": 2.008288860321045,
"initial_l0_probe": 73.42138671875,
"initial_lr_multiplier": 1.38794... | {
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],
"mean_l0": [
16.85,
15.61,
15.32,
19.47,
19.28,
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5 | 0 | HuggingFaceTB/SmolLM2-135M-Instruct | 576 | 18,432 | 50 | 32,768 | 4,001 | 0.0002 | 0.001338 | hot | {
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"initial_lr_multiplier": 1.387942646484375,
"early_pulse_multiplier": 1.03747421875,
"layer_lr_multiplier": 1
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"phase": "DESCENT",
"phase_step": 4000,
"pin_entry_step": null,
"pinned_lambda": null,
"pin_ev_count": 0,
"pin_retry_count": 0
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"mean_l0": 47.57,
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16.85,
15.61,
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5 | 0 | HuggingFaceTB/SmolLM2-135M-Instruct | 576 | 18,432 | 50 | 32,768 | 4,001 | 0.0002 | 0.001338 | hot | {
"activation_norm_probe": 4.198906421661377,
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"phase": "DESCENT",
"phase_step": 4000,
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"pinned_lambda": null,
"pin_ev_count": 0,
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"mean_l0": 47.57,
"dead_pct": 0,
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"ev": 0.9350036541075181,
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"initial_lr_multiplier": 1.38794... | {
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"mean_l0": [
16.85,
15.61,
15.32,
19.47,
19.28,
... |
| Layer | EV | Mean L0 | Recon Loss | Dead % |
|---|---|---|---|---|
| 0 | 0.9480 | 48.74 | 0.2074 | 0.0 |
| 1 | 0.9599 | 43.65 | 0.3298 | 0.0 |
| 2 | 0.9631 | 46.81 | 0.5021 | 0.0 |
| 3 | 0.9508 | 46.56 | 0.7462 | 0.0 |
| 4 | 0.9463 | 46.23 | 0.8936 | 0.0 |
| 5 | 0.9350 | 47.57 | 1.1605 | 0.0 |
| 6 | 0.9306 | 48.44 | 1.3838 | 0.0 |
| 7 | 0.9318 | 49.51 | 1.5446 | 0.0 |
| 8 | 0.9432 | 46.52 | 1.6598 | 0.0 |
| 9 | 0.9373 | 47.15 | 2.0706 | 0.0 |
| 10 | 0.9348 | 45.53 | 2.2983 | 0.0 |
| 11 | 0.9905 | 48.58 | 5.8113 | 0.0 |
| 12 | 0.9901 | 48.42 | 6.1039 | 0.0 |
| 13 | 0.9891 | 46.15 | 6.9692 | 0.0 |
| 14 | 0.9884 | 44.76 | 7.1844 | 0.0 |
| 15 | 0.9863 | 47.63 | 8.6521 | 0.0 |
| 16 | 0.9840 | 43.45 | 10.179 | 0.0 |
| 17 | 0.9808 | 45.88 | 12.363 | 0.0 |
| 18 | 0.9811 | 47.17 | 12.300 | 0.0 |
| 19 | 0.9775 | 46.23 | 15.521 | 0.0 |
| 20 | 0.9726 | 48.23 | 18.727 | 0.0 |
| 21 | 0.9667 | 46.49 | 24.817 | 0.0 |
| 22 | 0.9594 | 46.15 | 31.128 | 0.0 |
| 23 | 0.9418 | 45.13 | 47.936 | 0.0 |
| 24 | 0.9397 | 45.35 | 57.931 | 0.0 |
| 25 | 0.9299 | 46.33 | 74.413 | 0.0 |
| 26 | 0.9212 | 45.32 | 92.727 | 0.0 |
| 27 | 0.9139 | 45.69 | 118.75 | 0.0 |
| 28 | 0.8809 | 46.56 | 129.83 | 0.0 |
| 29 | 0.8812 | 52.01 | 196.36 | 0.0 |
Highlights:
- Dead features: 0.0% across all 30 layers. Not averaged. Every single layer.
- Mid layers 11–18: EV above 0.98, peaking at 0.9905 on layer 11
- L0 stayed tight: 43.45–52.01 against a target of 50
- Mean EV across all layers: 0.9519
SAE training
Target L0 of 50, rolling-HF capture, 500 pool batches, 5000 max steps, 32,768 tokens per microbatch. Custom trainer — built from scratch for this run, not adapted from an existing library. The full training log and per-layer breakdown live in smollm2-135-instruct-SAE-trainer.md. The raw Modal terminal output is preserved in smollm2-135-instruct-SAE-trainer.raw.log.
Layer 29 needed a separate pass due to an off-by-one in the layer range argument — 0,29 trained layers 0–28, not 0–29. It still converged clean — EV 0.8812, L0 52.01, 0 dead features.
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