{
 "schema_version": "1.7.0",
 "id": "x_NXMC-2020-0006",
 "modified": "2026-10-19T02:33:38.839Z",
 "published": "2026-10-18T09:00:52.565Z",
 "summary": "bert-base-cased: tokenizer change at 6c38be4 (2020-04-24)",
 "details": "bert-base-cased: model_type declared as \"bert\" (was unset); pad token unset to 0; batched training masks a different id (2020-04-24).\n\nRepository: https://huggingface.co/google-bert/bert-base-cased. Revisions from 6c38be42d6b3ed125933ca95fd0165fb9df8e414 onward carry this change; a pin at 38e5f9c0af8586e2e980a13387ede80a4461d22e or earlier does not.\n\nChanged keys:\n- model_type: unset -> bert (metadata)\n- pad_token_id: unset -> 0 (tokenizer)\n\nThis record says what the change does mechanically. It is not a report that anything broke for anyone.",
 "affected": [
  {
   "ranges": [
    {
     "type": "GIT",
     "repo": "https://huggingface.co/google-bert/bert-base-cased",
     "events": [
      {
       "introduced": "6c38be42d6b3ed125933ca95fd0165fb9df8e414"
      }
     ]
    }
   ],
   "database_specific": {
    "model": "google-bert/bert-base-cased",
    "previous_revision": "38e5f9c0af8586e2e980a13387ede80a4461d22e"
   }
  }
 ],
 "references": [
  {
   "type": "INTRODUCED",
   "url": "https://huggingface.co/google-bert/bert-base-cased/commit/6c38be42d6b3ed125933ca95fd0165fb9df8e414"
  },
  {
   "type": "PACKAGE",
   "url": "https://huggingface.co/google-bert/bert-base-cased"
  },
  {
   "type": "WEB",
   "url": "https://www.neurarch.com/changes-feeds/models/google-bert/bert-base-cased.html"
  }
 ],
 "database_specific": {
  "source": "neurarch model change tracker",
  "model": "google-bert/bert-base-cased",
  "kind": "tokenizer",
  "classes": [
   "tokenizer",
   "metadata"
  ],
  "changed_keys": [
   {
    "file": "config",
    "key": "model_type",
    "before": null,
    "after": "bert",
    "class": "metadata"
   },
   {
    "file": "config",
    "key": "pad_token_id",
    "before": null,
    "after": 0,
    "class": "tokenizer"
   }
  ],
  "impact": {
   "memory": false,
   "serving": true,
   "tokenizer": true,
   "licence": null
  },
  "breaking": true,
  "breaking_rule": "https://www.neurarch.com/changes-feeds/advisories/index.json#breaking_rule",
  "consequence": {
   "params": null,
   "weightsGbBf16": null,
   "trainPeakGb": null,
   "fingerprint": null,
   "context": null,
   "eos": null,
   "bos": null
  },
  "commit_date": "2020-04-24T15:54:55.000Z",
  "detected_at": "2026-10-18T09:00:52.565Z",
  "detected_by": "backfill",
  "days_since_first_commit": 311,
  "license": "CC-BY-4.0"
 }
}