{
 "schema_version": "1.7.0",
 "id": "x_NXMC-2020-0002",
 "modified": "2026-10-19T02:33:38.839Z",
 "published": "2026-10-18T09:00:52.565Z",
 "summary": "bart-large-mnli: tokenizer change at 048916a (2020-04-24)",
 "details": "bart-large-mnli: EOS declared as 2 (was unset); generation that relied on the library default now stops on this token; BOS declared as 0 (was unset); pad token unset to 1; batched training masks a different id (2020-04-24).\n\nRepository: https://huggingface.co/facebook/bart-large-mnli. Revisions from 048916aef0957008cf5628d087c4a1e794704f73 onward carry this change; a pin at a9aaa74e9eb0c21b338955c15bb56489b869e193 or earlier does not.\n\nChanged keys:\n- bos_token_id: unset -> 0 (tokenizer)\n- eos_token_id: unset -> 2 (tokenizer)\n- pad_token_id: unset -> 1 (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/facebook/bart-large-mnli",
     "events": [
      {
       "introduced": "048916aef0957008cf5628d087c4a1e794704f73"
      }
     ]
    }
   ],
   "database_specific": {
    "model": "facebook/bart-large-mnli",
    "previous_revision": "a9aaa74e9eb0c21b338955c15bb56489b869e193"
   }
  }
 ],
 "references": [
  {
   "type": "INTRODUCED",
   "url": "https://huggingface.co/facebook/bart-large-mnli/commit/048916aef0957008cf5628d087c4a1e794704f73"
  },
  {
   "type": "PACKAGE",
   "url": "https://huggingface.co/facebook/bart-large-mnli"
  },
  {
   "type": "WEB",
   "url": "https://www.neurarch.com/changes-feeds/models/facebook/bart-large-mnli.html"
  }
 ],
 "database_specific": {
  "source": "neurarch model change tracker",
  "model": "facebook/bart-large-mnli",
  "kind": "tokenizer",
  "classes": [
   "tokenizer"
  ],
  "changed_keys": [
   {
    "file": "config",
    "key": "bos_token_id",
    "before": null,
    "after": 0,
    "class": "tokenizer"
   },
   {
    "file": "config",
    "key": "eos_token_id",
    "before": null,
    "after": 2,
    "class": "tokenizer"
   },
   {
    "file": "config",
    "key": "pad_token_id",
    "before": null,
    "after": 1,
    "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": 2
   },
   "bos": {
    "before": null,
    "after": 0
   }
  },
  "commit_date": "2020-04-24T15:58:44.000Z",
  "detected_at": "2026-10-18T09:00:52.565Z",
  "detected_by": "backfill",
  "days_since_first_commit": 52,
  "license": "CC-BY-4.0"
 }
}