{
  "dataset": "WikiText-2",
  "seed": 42,
  "steps_per_variant": 30,
  "baseline": {
    "lm_loss": 5.7470527,
    "perplexity": 313.266,
    "parameters": 139584
  },
  "method": {
    "lm_loss": 6.153316,
    "perplexity": 470.2742,
    "parameters": 410048
  },
  "relative": {
    "lm_loss_percent": 7.0691,
    "perplexity_percent": 50.1198
  },
  "evolve_architecture": "engram",
  "schema_version": 2,
  "manifest_ref": "reproduction:engram",
  "evaluation_protocol": {
    "tier": "l2_public_dataset",
    "seeds": [
      42
    ],
    "formal_comparison": false,
    "claim_policy": "single/few-seed smoke result; do not claim a stable improvement"
  },
  "provenance": {
    "artifact_path": "docs/reproductions/2601.07372-engram/metrics/wikitext2-seed42.json",
    "historical_migration": "historical-metrics-v2-2026-08-09",
    "original_code_commit": "not recorded",
    "dataset_fingerprint": "not recorded in historical artifact"
  }
}