{
  "schema_version": 2,
  "adapter_key": "branch-opd",
  "method": "branch-opd",
  "seeds": [
    42
  ],
  "dataset": {
    "id": "openai/grade-school-math",
    "revision": "3101c7d5072418e28b9008a6636bde82a006892c",
    "train_sha256": "6b8672439c8cf6f6b6e65bf5f0e515fbf4c497c9066eefb62a6a6a61ced158e3",
    "validation_sha256": "2cf1119ad7b2e31e825274487ef32c073e03a8ed44f08ecd3e0366c1f40ebdb7"
  },
  "diagnostic_only": true,
  "measured_locally": true,
  "evaluation_tier": "l1_mechanism",
  "metrics": {
    "adapter_parameter_delta_l2": 0.008337237479241007,
    "validation_examples": 4,
    "validation_exact_match": 0.5,
    "sampled_branches": 12,
    "pbr_constraints": 8
  },
  "run": {
    "schema_version": 1,
    "adapter_key": "branch-opd",
    "seed": 42,
    "diagnostic_only": true,
    "evaluation_tier": "l1_mechanism",
    "claim_scope": "bounded real checkpoint runtime validation; no benchmark gain claim",
    "models": {
      "student": {
        "id": "Qwen/Qwen2.5-0.5B-Instruct",
        "revision": "7ae557604adf67be50417f59c2c2f167def9a775",
        "immutable_revision_verified": true,
        "verification": "pinned public-source manifest with exact file SHA256",
        "file_sha256": {
          "config.json": "18e18afcaccafade98daf13a54092927904649e1dd4eba8299ab717d5d94ff45",
          "generation_config.json": "e558847a8b4402616f1273797b015104dc266fe4b520056fca88823ba8f8ebe6",
          "merges.txt": "599bab54075088774b1733fde865d5bd747cbcc7a547c5bc12610e874e26f5e3",
          "model.safetensors": "fdf756fa7fcbe7404d5c60e26bff1a0c8b8aa1f72ced49e7dd0210fe288fb7fe",
          "tokenizer.json": "c0382117ea329cdf097041132f6d735924b697924d6f6fc3945713e96ce87539",
          "tokenizer_config.json": "5b5d4f65d0acd3b2d56a35b56d374a36cbc1c8fa5cf3b3febbbfabf22f359583",
          "vocab.json": "ca10d7e9fb3ed18575dd1e277a2579c16d108e32f27439684afa0e10b1440910"
        }
      },
      "teacher": {
        "id": "Qwen/Qwen2.5-7B-Instruct",
        "revision": "bb46c15ee4bb56c5b63245ef50fd7637234d6f75",
        "immutable_revision_verified": true,
        "verification": "pinned public-source manifest with exact file SHA256",
        "file_sha256": {
          "config.json": "7463bb0ea78315365e6c6b74de4e73bbcc8359dfb0c5a737584e077d42c0b03c",
          "generation_config.json": "3a8f9087e486054c8a4a08dae2e5a3ba62e23da212b5b8c08bc42cb983c3459f",
          "merges.txt": "599bab54075088774b1733fde865d5bd747cbcc7a547c5bc12610e874e26f5e3",
          "model-00001-of-00004.safetensors": "a1333e6293854747c481288ea83b348226af178dd565c49b6f9495ba1966aba7",
          "model-00002-of-00004.safetensors": "f5d25a2772cb825164a2a2c0fb6d51a87e282abf21e4dd75bc5cfb3cd0ea6185",
          "model-00003-of-00004.safetensors": "8efdec4c1bc12317ae1a38dc42b595ce777738a64deea3fcb8a0a91381bcdfd5",
          "model-00004-of-00004.safetensors": "1a72d403cdf0c1ec3cb7f289f17b394a01e64394c2e9b3c0f94dbce3faf879bd",
          "model.safetensors.index.json": "624bf7c47cd12468fdc16e38a47cf4f19e0415b859a223ba3c027eed2f0e1028",
          "tokenizer.json": "c0382117ea329cdf097041132f6d735924b697924d6f6fc3945713e96ce87539",
          "tokenizer_config.json": "5b5d4f65d0acd3b2d56a35b56d374a36cbc1c8fa5cf3b3febbbfabf22f359583",
          "vocab.json": "ca10d7e9fb3ed18575dd1e277a2579c16d108e32f27439684afa0e10b1440910"
        }
      }
    },
    "dataset": {
      "id": "openai/grade-school-math",
      "revision": "3101c7d5072418e28b9008a6636bde82a006892c",
      "train_sha256": "6b8672439c8cf6f6b6e65bf5f0e515fbf4c497c9066eefb62a6a6a61ced158e3",
      "validation_sha256": "2cf1119ad7b2e31e825274487ef32c073e03a8ed44f08ecd3e0366c1f40ebdb7"
    },
    "budget": {
      "steps": 2,
      "max_tokens": 512,
      "group": 2,
      "forks": 3,
      "continuations": 2,
      "priming_examples": 2,
      "rounds": 2,
      "pool_examples": 4,
      "acquisition": 2,
      "teacher_rollouts": 2
    },
    "metrics": {
      "adapter_parameter_delta_l2": 0.008337237479241007,
      "validation_examples": 4,
      "validation_exact_match": 0.5,
      "sampled_branches": 12,
      "pbr_constraints": 8
    },
    "history": [
      {
        "loss": 15.453265190124512,
        "gradient_l2": 22.87696075439453,
        "response_tokens": 1244,
        "selected_forks": [
          0,
          8,
          9
        ],
        "branches": 6,
        "shared_prefix_tokens_excluded": 34,
        "pbr_constraints": 5,
        "step": 0
      },
      {
        "loss": 13.375693321228027,
        "gradient_l2": 20.84510040283203,
        "response_tokens": 985,
        "selected_forks": [
          13,
          20,
          179
        ],
        "branches": 6,
        "shared_prefix_tokens_excluded": 424,
        "pbr_constraints": 3,
        "step": 1
      }
    ],
    "split_provenance": {
      "verified": true,
      "test_read": false,
      "source_id": "openai/grade-school-math",
      "source_revision": "3101c7d5072418e28b9008a6636bde82a006892c",
      "source_sha256": "17f347dc51477c50d4efb83959dbb7c56297aba886e5544ee2aaed3024813465",
      "partition_sha256": {
        "train": "6b8672439c8cf6f6b6e65bf5f0e515fbf4c497c9066eefb62a6a6a61ced158e3",
        "validation": "2cf1119ad7b2e31e825274487ef32c073e03a8ed44f08ecd3e0366c1f40ebdb7"
      },
      "partition": "normalized-question sha256 unsigned-prefix / 2^64 < 0.1 validation"
    },
    "test_read": false,
    "validation_used_for_selection": false,
    "gold_in_rollout": false
  },
  "provenance": {
    "executed_commit": "456a2ffacc47658c4ccb74f386465d47e5f4e357",
    "raw_result_sha256": "5d907840d525a9668a43ac0a826d3d02994049a7e35f90a2f700815a3761fcf0",
    "source_hash_origin": "git show executed_commit:path; not current HEAD or dirty files",
    "artifact_path": "docs/reproductions/2610.13481-branch-opd/metrics/gsm8k-a100-42.json",
    "dataset_fingerprint": "source_sha256:17f347dc51477c50d4efb83959dbb7c56297aba886e5544ee2aaed3024813465;train_sha256:6b8672439c8cf6f6b6e65bf5f0e515fbf4c497c9066eefb62a6a6a61ced158e3;validation_sha256:2cf1119ad7b2e31e825274487ef32c073e03a8ed44f08ecd3e0366c1f40ebdb7",
    "executed_code_commit": "456a2ffacc47658c4ccb74f386465d47e5f4e357",
    "gpu_validation_artifact": "docs/gpu-validations/branch-opd-a100-20261012.json"
  },
  "historical_evidence": "../assets/historical-pbr-unexercised.json",
  "manifest_ref": "reproduction:branch-opd",
  "evaluation_protocol": {
    "tier": "l1_mechanism",
    "seeds": [
      42
    ],
    "formal_comparison": false,
    "claim_policy": "single/few-seed smoke result; do not claim a stable improvement"
  }
}