Add original paper ladder checkpoint and evaluation metadata

README.md

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+---
+language:
+- en
+tags:
+- looped-transformer
+- scaling-laws
+- pytorch
+- base-model
+datasets:
+- HuggingFaceFW/fineweb
+pipeline_tag: text-generation
+---
+
+# loop-grow-d12
+
+Loop Grow, depth coordinate **d12**, from **How Model Growth, Recursion, and Boundary Operators Influence Scaling Exponents**.
+
+This is the original final checkpoint used by the paper's FineWeb scaling ladder. It contains 494,272,512 stored parameters in FP32 (1.977 GB). This is a pretrained base language model, without instruction tuning. The checkpoint preserves the original training artifact and does not contain optimizer state for resuming training.
+
+| Setting | Value |
+| --- | --- |
+| Training corpus | FineWeb |
+| Tokenizer | GPT-2 (`tiktoken.get_encoding("gpt2")`) |
+| Vocabulary | 50,257 tokens, padded to 50,304 model rows |
+| Context length | 2,048 |
+| Width | 1536 |
+| Attention heads | 12 |
+| Model depth mode | `loop` |
+| Configured core repetitions | 4 |
+| Final evaluation repetitions | 4 |
+| Pretraining validation NLL | 2.918357 nats/token |
+
+The depth coordinate is the ladder's scaling coordinate; it need not equal the number of executed Transformer blocks. `result.json` provides the model configuration, parameter counts, training settings, and recorded validation metrics. Validation NLL is measured on the pretraining corpus and is distinct from CORE answer NLL.
+
+## Files
+
+- `final.pt`: original PyTorch checkpoint, including learned weights and training arguments.
+- `result.json`: portable training metadata for reconstructing the model.
+- `SHA256SUMS`: checksum of the original checkpoint.
+
+## Evaluation
+
+Use the paper's codebase at [cue-engineering/loop](https://github.com/cue-engineering/loop), install its dependencies, and download this repository's files:
+
+```python
+from huggingface_hub import snapshot_download
+snapshot_download(repo_id="CharlieChen/loop-grow-d12", local_dir="checkpoints/loop-grow-d12")
+```
+
+From the codebase root, run a bounded GPU smoke evaluation:
+
+```bash
+CUDA_VISIBLE_DEVICES=0 python eval.py \
+  --checkpoint checkpoints/loop-grow-d12/final.pt \
+  --result-json checkpoints/loop-grow-d12/result.json \
+  --max-per-task 10 --seeds 0 1 2 \
+  --out checkpoints/loop-grow-d12/core_smoke.json
+```
+
+The paper uses H100 GPUs, FlashAttention-3, and bfloat16 autocast. The custom `TransformerGPT` model is reconstructed by the paper code; this artifact is not a Transformers `AutoModel` checkpoint. Full CORE evaluation uses all 22 tasks and seeds 0/1/2; omit `--max-per-task` to run it. Smoke scores are not full-suite paper results.

SHA256SUMS

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+a4345d2cee220f98c86d02b6af7b8e3c4a7feb4e5400544cd1da2de5bb5b39b0  final.pt

final.pt

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+version https://git-lfs.github.com/spec/v1
+oid sha256:a4345d2cee220f98c86d02b6af7b8e3c4a7feb4e5400544cd1da2de5bb5b39b0
+size 1977113897

result.json

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+{
+  "parameter_count": 494272512,
+  "parameter_summary": {
+    "total": 494272512,
+    "parts": {
+      "blocks": 339738624,
+      "lm_head": 77266944,
+      "other": 77266944
+    }
+  },
+  "n_layer": 12,
+  "n_head": 12,
+  "n_embd": 1536,
+  "head_dim": 128,
+  "depth_scale_mode": "loop",
+  "core_repetitions": 4,
+  "core_layer_count": 4,
+  "resolved_core_layer_count": 4,
+  "prelude_layer_count": 4,
+  "resolved_prelude_layer_count": 4,
+  "coda_layer_count": 4,
+  "resolved_coda_layer_count": 4,
+  "effective_depth": 24,
+  "expected_effective_depth": 24.0,
+  "recurrence_rmsnorm": "recurrence_only",
+  "recurrence_emb_alpha": 0.707106781187,
+  "decoder_inject": true,
+  "core_residual_branch_scale": 1.0,
+  "resolved_core_residual_branch_scale": null,
+  "core_repetition_schedule": "late",
+  "core_repetition_crossover_fraction": 0.85,
+  "core_repetition_low": 2,
+  "core_repetition_breakpoints": null,
+  "lsched_lr_warmup_steps": 40,
+  "lsched_lr_change_steps": [
+    5271
+  ],
+  "dep_grow_events": [],
+  "target_core_repetitions": 4,
+  "final_eval_active_core_repetitions": 4,
+  "observed_train_core_repetitions_mean": 2.3002257336343117,
+  "observed_train_core_repetitions_min": 2,
+  "observed_train_core_repetitions_max": 4,
+  "observed_train_core_repetitions_histogram": {
+    "2": 5271,
+    "4": 931
+  },
+  "recurrence_truncation_schedule": "none",
+  "recurrence_bp_window": 0,
+  "matrix_lr": 0.025809616490134198,
+  "embedding_lr": 0.008259077276842943,
+  "unembedding_lr": 0.0029200247744036183,
+  "lr_multiplier": 1.0,
+  "effective_matrix_lr": 0.025809616490134198,
+  "effective_embedding_lr": 0.008259077276842943,
+  "effective_unembedding_lr": 0.0029200247744036183,
+  "weight_decay": 0.05,
+  "matrix_weight_decay": 0.05,
+  "embedding_weight_decay": 0.05,
+  "unembedding_weight_decay": 0.05,
+  "embedding_wd_skip_norm": 0.0,
+  "adam_betas": [
+    0.8,
+    0.95
+  ],
+  "adam_eps": 1e-10,
+  "lr_schedule": "wsd",
+  "warmup_steps": 40,
+  "warmdown_ratio": 1.0,
+  "output_multiplier": 1.0,
+  "residual_branch_multiplier": 0.25,
+  "wte_init_std": 0.02,
+  "uniform_init_scale": 0.0441941738242,
+  "total_batch_size": 524288,
+  "device_batch_size": 16,
+  "num_epochs": 1,
+  "estimated_num_iterations": 6260,
+  "lr_schedule_steps": 6202,
+  "resolved_lr_schedule_steps": 6202,
+  "max_train_steps": 6202,
+  "resolved_max_train_steps": 6202,
+  "completed_epochs": 0,
+  "seed": 42,
+  "train_token_limit": 3284150517,
+  "val_token_limit": 10000000,
+  "token_limit_cutoff_devices": 16,
+  "active_train_tokens": 3284150517,
+  "packed_train_sequences_per_epoch": 1602560,
+  "packed_train_tokens_per_epoch": 3282042880,
+  "active_val_packed_sequences": 4864,
+  "active_val_packed_tokens": 9961472,
+  "val_loss": 2.9183570460269324,
+  "final_val_loss": 2.9183570460269324,
+  "final_train_loss": 2.948449089218614,
+  "best_val_loss": 2.9183570460269324,
+  "best_val_bpb": 0.9484911759835458,
+  "best_val_epoch": 1.0,
+  "train_val_per_epoch": [
+    {
+      "epoch": 1,
+      "step": 6202,
+      "train_loss": 2.948449089218614,
+      "val_loss": 2.9183570460269324,
+      "val_bpb": 0.9484911759835458
+    }
+  ],
+  "core_block_residual_rms": 1.0481101274490356,
+  "last_train_mfu": 47.116359427132814,
+  "last_train_tok_per_sec": 746514,
+  "last_train_step_time_seconds": 0.7023148536682129,
+  "total_training_time_seconds": 3265.4880912303925,
+  "total_wall_time_seconds": 3338.4041845798492,
+  "sequence_len": 2048,
+  "window_pattern": "L"
+}