{
 "schema_version": "1.7.0",
 "id": "x_NXMC-2020-0032",
 "modified": "2026-10-19T02:33:38.839Z",
 "published": "2026-10-18T09:00:52.565Z",
 "summary": "t5-small: tokenizer change at 3ac06c3 (2020-04-24)",
 "details": "t5-small: EOS declared as 1 (was unset); generation that relied on the library default now stops on this token; model_type declared as \"t5\" (was unset); pad token unset to 0; batched training masks a different id (2020-04-24).\n\nRepository: https://huggingface.co/google-t5/t5-small. Revisions from 3ac06c3177fe685e9fba04b1166dde3a65efe70a onward carry this change; a pin at 00f126a8df80c3d2658ce9f1df7e573b740e3b9d or earlier does not.\n\nChanged keys:\n- eos_token_id: unset -> 1 (tokenizer)\n- model_type: unset -> t5 (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-t5/t5-small",
     "events": [
      {
       "introduced": "3ac06c3177fe685e9fba04b1166dde3a65efe70a"
      }
     ]
    }
   ],
   "database_specific": {
    "model": "google-t5/t5-small",
    "previous_revision": "00f126a8df80c3d2658ce9f1df7e573b740e3b9d"
   }
  }
 ],
 "references": [
  {
   "type": "INTRODUCED",
   "url": "https://huggingface.co/google-t5/t5-small/commit/3ac06c3177fe685e9fba04b1166dde3a65efe70a"
  },
  {
   "type": "PACKAGE",
   "url": "https://huggingface.co/google-t5/t5-small"
  },
  {
   "type": "WEB",
   "url": "https://www.neurarch.com/changes-feeds/models/google-t5/t5-small.html"
  }
 ],
 "database_specific": {
  "source": "neurarch model change tracker",
  "model": "google-t5/t5-small",
  "kind": "tokenizer",
  "classes": [
   "tokenizer",
   "metadata"
  ],
  "changed_keys": [
   {
    "file": "config",
    "key": "eos_token_id",
    "before": null,
    "after": 1,
    "class": "tokenizer"
   },
   {
    "file": "config",
    "key": "model_type",
    "before": null,
    "after": "t5",
    "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": {
    "before": null,
    "after": 1
   },
   "bos": null
  },
  "commit_date": "2020-04-24T16:06:20.000Z",
  "detected_at": "2026-10-18T09:00:52.565Z",
  "detected_by": "backfill",
  "days_since_first_commit": 135,
  "license": "CC-BY-4.0"
 }
}