Add model card, checkpoint catalog, usage, and provenance

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NOTICE

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+Loop-distil recurrent checkpoint exports
+
+Derived from tomg-group-umd/huginn-0125, released under Apache License 2.0.
+Base revision: bb6621b65e90b6a4b9b29ef88dc83866d450470c
+Base project: https://huggingface.co/tomg-group-umd/huginn-0125
+Base research: https://arxiv.org/abs/2502.05171
+
+Modifications: trajectory-regression initialization and optional KL distillation
+of the shared adapter/recurrent core, published by Nicholas0228/loop-distil.
+Frozen base weights are obtained separately from the pinned original model.
+Research code and records: https://github.com/Nicholas0228/loop-distil

README.md

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+---
+license: apache-2.0
+base_model: tomg-group-umd/huginn-0125
+base_model_relation: finetune
+language:
+- en
+tags:
+- recurrent
+- distillation
+- gsm8k
+- safetensors
+- custom-code
+datasets:
+- openai/gsm8k
+---
+
+# Loop-distil: four- and eight-loop Huginn research checkpoints
+
+Recurrent adapter/core weights from [Nicholas0228/loop-distil](https://github.com/Nicholas0228/loop-distil). The [code and research summary](https://github.com/Nicholas0228/loop-distil#readme) explain trajectory initialization, direct-KL distillation, the sampled-depth proposal, and all evaluation limitations.
+
+**These are partial model checkpoints.** Each subdirectory contains all 37 trained recurrent adapter/core tensors as BF16 safetensors (3.05 GiB), with metadata and SHA-256 checksums. They replace the corresponding tensors in the pinned Huginn base; they are not additive deltas or LoRA adapters. Use the provided loader rather than calling `AutoModelForCausalLM.from_pretrained` on this repository.
+
+## Use a checkpoint
+
+```bash
+git clone https://github.com/Nicholas0228/loop-distil.git
+cd loop-distil
+python3 -m venv .venv
+.venv/bin/pip install -r requirements.txt
+.venv/bin/python scripts/generate_released.py \
+  --checkpoint 8loop-stage2-proposal-low-lr-100 \
+  --question "A box contains 12 pencils. Mia buys 3 boxes. How many pencils does she buy?"
+```
+
+The loader downloads `tomg-group-umd/huginn-0125` at revision `bb6621b65e90b6a4b9b29ef88dc83866d450470c`, applies the selected weights, and sets the correct loop count. The base uses its pinned custom model code. CUDA inference was checked on an A800 40 GB. Use `--cache-dir /path/with/space` to choose storage, `--base-model-path /path/to/pinned/base` to reuse an existing snapshot, and `--revision <Hub commit>` to pin this release.
+
+Generation uses the study's eight-shot GSM8K prompt, greedy decoding and a 256-token cap. `--max-new-tokens` changes the cap. Python users can import `load_release` from `loop_distil.released`; the returned model wrapper provides `rollout` with explicit loop count, seed and generation cap.
+
+## Checkpoints
+
+All answer counts are automatic final numeric matches on the same 128 held-out GSM8K development questions. They are not a fresh official test result or a manual assessment of every solution. The frozen 32-loop teacher scores 59/128.
+
+| ID | Stage-1 updates | Stage-2 updates | Stage-2 LR | Matches /128 |
+|---|---:|---:|---|---:|
+| `4loop-stage1-2000` | 2,000 | — | — | 28 |
+| `4loop-stage1-3500` | 3,500 | — | — | 38 |
+| `4loop-stage1-4000` | 4,000 | — | — | 34 |
+| `4loop-stage2-direct-500` | 2,000 | 500 | `2e-7` | 32 |
+| `4loop-stage2-proposal-500` | 2,000 | 500 | `2e-7` | 31 |
+| `8loop-stage1-1000` | 1,000 | — | — | 46 |
+| `8loop-stage2-direct-low-lr-100` | 1,000 | 100 | `2e-7` | 48 |
+| `8loop-stage2-proposal-low-lr-100` | 1,000 | 100 | `2e-7` | 55 |
+| `8loop-stage2-direct-low-lr-300` | 1,000 | 300 | `2e-7` | 47 |
+| `8loop-stage2-proposal-low-lr-300` | 1,000 | 300 | `2e-7` | 48 |
+| `8loop-stage2-direct-high-lr-100` | 1,000 | 100 | `2e-6` | 32 |
+| `8loop-stage2-proposal-high-lr-100` | 1,000 | 100 | `2e-6` | 8 |
+
+Stage 1 matches student trajectory states to teacher depths 8/16/24/32 for four loops, or 4/8/…/32 for eight loops, using LR `2e-6`. Stage 2 compares direct endpoint forward KL and the sampled-depth interpolated teacher-continuation KL. Both arms use identical cached teacher-generated answer prefixes and matched scored-token/update budgets. Four-loop stage 2 has not been rerun from the 3,500- or 4,000-update initialization.
+
+## Interpretation and limitations
+
+- Initialization improves answer scores, but continuing to minimize MSE does not guarantee monotonic accuracy gains. The four-loop 3,500 checkpoint is a retrospectively selected peak; 4,000 is the predeclared endpoint.
+- A tenfold lower stage-2 LR helps both eight-loop methods in the 100-update screen. The proposal's early 55-versus-48 result is promising but uncertain; its paired-question 95% interval versus direct KL includes zero. The later matched scores are 48 versus 47, and the four-loop comparison does not establish a proposal advantage.
+- This is one training seed and a repeatedly reused development cohort. No convergence, reliable method superiority, or optimal learning rate is claimed. Loose number occurrences are not counted as extra correct answers. Numeric scoring has formatting and wrong-quantity artifacts.
+- The teacher-generated training corpus contains 2,974 questions and was not filtered for teacher correctness. The models can produce incorrect or repetitive solutions.
+- BF16 exports reproduce the compute weights used for evaluation. They omit FP32 masters and Adam state. They can initialize new fine-tuning but cannot exactly resume the original optimizer trajectory.
+
+## Provenance and license
+
+The base is [Huginn](https://huggingface.co/tomg-group-umd/huginn-0125), pinned to the revision above. Only the adapter/core weights were trained; the frozen components come from the base. The derived weights are distributed under Apache-2.0, with the base attribution in [NOTICE](NOTICE) and the license text in [LICENSE](LICENSE). Each checkpoint's `checkpoint.json` records its source master hash, training depths and updates, prefix policy, score, source report, and export checksum. `catalog.json` indexes the release.

catalog.json

@@ -0,0 +1,424 @@
+{
+  "schema_version": 1,
+  "repo_id": "Nicholas0228/loop-distil-checkpoints",
+  "weights_revision": "caa36badb2df9481350bb5945d1f7192971afa10",
+  "source_code_commit": "bf8005f43a2be2b9ca0cc2c7fed3512bcc8664a0",
+  "base_model": "tomg-group-umd/huginn-0125",
+  "base_revision": "bb6621b65e90b6a4b9b29ef88dc83866d450470c",
+  "created_utc": "2026-10-09T20:30:17.370553+00:00",
+  "checkpoint_count": 12,
+  "logical_weights_bytes": 39296431104,
+  "format": "loop-distil-recurrent-bf16-v1",
+  "optimizer_included": false,
+  "evaluation_scope": "128 repeatedly reused held-out GSM8K development questions; one training seed; automatic numeric answer matching, not a fresh test-set estimate.",
+  "checkpoints": [
+    {
+      "id": "4loop-stage1-4000",
+      "student_depth": 4,
+      "teacher_depth": 32,
+      "stage1_updates": 4000,
+      "stage2_updates": 0,
+      "checkpoint_step": 4000,
+      "learning_rate": 2e-06,
+      "comparison_report": "reports/four_loop_long_init_20261009/comparison.json",
+      "selection": "predeclared endpoint",
+      "evaluation": {
+        "questions": 128,
+        "final_matches": 34,
+        "strict_matches": 25,
+        "cap_hits": 3,
+        "split": "held-out GSM8K development",
+        "generation_cap": 256
+      },
+      "prefix_policy": "cached teacher32-generated answer prefixes",
+      "format": "loop-distil-recurrent-bf16-v1",
+      "base_model": "tomg-group-umd/huginn-0125",
+      "base_revision": "bb6621b65e90b6a4b9b29ef88dc83866d450470c",
+      "weights_sha256": "f99e853cc4ca2314032e7e354a43da477b087dc3723eef585606ed92cc245848",
+      "source_master_sha256": "3fbc991e54a9ad09a8b5cd03ac7e50d9b092281a6615c74f96ea54d7195a9817",
+      "tensor_count": 37,
+      "parameters": 1637349120,
+      "weights_bytes": 3274702592,
+      "dtype": "bfloat16",
+      "exact_bf16_compute_roundtrip": true,
+      "optimizer_included": false,
+      "source_checkpoint_filename": "step_4000.pt",
+      "note": "Full replacements for adapter/core tensors, not additive deltas or LoRA. Combine with the pinned base. Original FP32 masters and Adam states remain in local recovery checkpoints.",
+      "checkpoint_revision": "7ffd5737aa8dfbf7af312c7330e907c78e75c762"
+    },
+    {
+      "id": "4loop-stage1-3500",
+      "student_depth": 4,
+      "teacher_depth": 32,
+      "stage1_updates": 3500,
+      "stage2_updates": 0,
+      "checkpoint_step": 3500,
+      "learning_rate": 2e-06,
+      "comparison_report": "reports/four_loop_long_init_20261009/comparison.json",
+      "selection": "best observed development accuracy; selected after evaluation",
+      "evaluation": {
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+        "final_matches": 38,
+        "strict_matches": 26,
+        "cap_hits": 7,
+        "split": "held-out GSM8K development",
+        "generation_cap": 256
+      },
+      "prefix_policy": "cached teacher32-generated answer prefixes",
+      "format": "loop-distil-recurrent-bf16-v1",
+      "base_model": "tomg-group-umd/huginn-0125",
+      "base_revision": "bb6621b65e90b6a4b9b29ef88dc83866d450470c",
+      "weights_sha256": "b5ed80020f3288b146534014079b6e9b82d549f11995ddcf50dd0884e1b6c242",
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+      "weights_bytes": 3274702592,
+      "dtype": "bfloat16",
+      "exact_bf16_compute_roundtrip": true,
+      "optimizer_included": false,
+      "source_checkpoint_filename": "step_3500.pt",
+      "note": "Full replacements for adapter/core tensors, not additive deltas or LoRA. Combine with the pinned base. Original FP32 masters and Adam states remain in local recovery checkpoints.",
+      "checkpoint_revision": "8b9e683d76a7aaac3be929568aefe3ae34a55421"
+    },
+    {
+      "id": "4loop-stage1-2000",
+      "student_depth": 4,
+      "teacher_depth": 32,
+      "stage1_updates": 2000,
+      "stage2_updates": 0,
+      "checkpoint_step": 2000,
+      "learning_rate": 2e-06,
+      "comparison_report": "reports/four_loop_long_init_20261009/comparison.json",
+      "selection": "predeclared endpoint",
+      "evaluation": {
+        "questions": 128,
+        "final_matches": 28,
+        "strict_matches": 21,
+        "cap_hits": 5,
+        "split": "held-out GSM8K development",
+        "generation_cap": 256
+      },
+      "prefix_policy": "cached teacher32-generated answer prefixes",
+      "format": "loop-distil-recurrent-bf16-v1",
+      "base_model": "tomg-group-umd/huginn-0125",
+      "base_revision": "bb6621b65e90b6a4b9b29ef88dc83866d450470c",
+      "weights_sha256": "11443bbd5815d9ced04b97bac963c0fb71a2804af62cac88640deac0eb9db567",
+      "source_master_sha256": "9126e5b82feb48af5d90eb06288afecc5e09fb27f388360cfe55529c4f9a72f5",
+      "tensor_count": 37,
+      "parameters": 1637349120,
+      "weights_bytes": 3274702592,
+      "dtype": "bfloat16",
+      "exact_bf16_compute_roundtrip": true,
+      "optimizer_included": false,
+      "source_checkpoint_filename": "step_2000.pt",
+      "note": "Full replacements for adapter/core tensors, not additive deltas or LoRA. Combine with the pinned base. Original FP32 masters and Adam states remain in local recovery checkpoints.",
+      "checkpoint_revision": "20491d260c900a74dd2110acd5001e2830f5286c"
+    },
+    {
+      "id": "4loop-stage2-direct-500",
+      "student_depth": 4,
+      "teacher_depth": 32,
+      "stage1_updates": 2000,
+      "stage2_updates": 500,
+      "checkpoint_step": 500,
+      "learning_rate": 2e-07,
+      "comparison_report": "reports/four_loop_extend_20261009/comparison.json",
+      "selection": "predeclared endpoint",
+      "evaluation": {
+        "questions": 128,
+        "final_matches": 32,
+        "strict_matches": 26,
+        "cap_hits": 3,
+        "split": "held-out GSM8K development",
+        "generation_cap": 256
+      },
+      "prefix_policy": "cached teacher32-generated answer prefixes",
+      "format": "loop-distil-recurrent-bf16-v1",
+      "base_model": "tomg-group-umd/huginn-0125",
+      "base_revision": "bb6621b65e90b6a4b9b29ef88dc83866d450470c",
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+      "parameters": 1637349120,
+      "weights_bytes": 3274702592,
+      "dtype": "bfloat16",
+      "exact_bf16_compute_roundtrip": true,
+      "optimizer_included": false,
+      "source_checkpoint_filename": "step_0500.pt",
+      "note": "Full replacements for adapter/core tensors, not additive deltas or LoRA. Combine with the pinned base. Original FP32 masters and Adam states remain in local recovery checkpoints.",
+      "checkpoint_revision": "8332597d21f85f332f7d0161fe512a763f84b2da"
+    },
+    {
+      "id": "4loop-stage2-proposal-500",
+      "student_depth": 4,
+      "teacher_depth": 32,
+      "stage1_updates": 2000,
+      "stage2_updates": 500,
+      "checkpoint_step": 500,
+      "learning_rate": 2e-07,
+      "comparison_report": "reports/four_loop_extend_20261009/comparison.json",
+      "selection": "predeclared endpoint",
+      "evaluation": {
+        "questions": 128,
+        "final_matches": 31,
+        "strict_matches": 22,
+        "cap_hits": 1,
+        "split": "held-out GSM8K development",
+        "generation_cap": 256
+      },
+      "prefix_policy": "cached teacher32-generated answer prefixes",
+      "format": "loop-distil-recurrent-bf16-v1",
+      "base_model": "tomg-group-umd/huginn-0125",
+      "base_revision": "bb6621b65e90b6a4b9b29ef88dc83866d450470c",
+      "weights_sha256": "ac2856418979243e31cad3368c39bc469f52961e24e06d707142056208fc9ee3",
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+      "tensor_count": 37,
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+      "dtype": "bfloat16",
+      "exact_bf16_compute_roundtrip": true,
+      "optimizer_included": false,
+      "source_checkpoint_filename": "step_0500.pt",
+      "note": "Full replacements for adapter/core tensors, not additive deltas or LoRA. Combine with the pinned base. Original FP32 masters and Adam states remain in local recovery checkpoints.",
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+      "note": "Full replacements for adapter/core tensors, not additive deltas or LoRA. Combine with the pinned base. Original FP32 masters and Adam states remain in local recovery checkpoints.",
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