{
 "schema_version": "1.7.0",
 "id": "x_NXMC-2023-0009",
 "modified": "2026-10-19T02:33:38.839Z",
 "published": "2026-10-18T09:00:52.565Z",
 "summary": "falcon-7b: structural change at 4e2d06f (2023-07-12)",
 "details": "falcon-7b: EOS changed from 2 to 11; anything fine-tuned or served against the old value stops at a different token; BOS changed from 1 to 11; prompts built by the old tokenizer start with a different token; architectures [\"RWForCausalLM\"] to [\"FalconForCausalLM\"]; a different class is instantiated from the same id (2023-07-12).\n\nRepository: https://huggingface.co/tiiuae/falcon-7b. Revisions from 4e2d06f0a7c6370ebabbc30c6f59377ae8f73d76 onward carry this change; a pin at 2e3586947baae789afb6b8966bff3df919084bfb or earlier does not.\n\nChanged keys:\n- architectures: [\"RWForCausalLM\"] -> [\"FalconForCausalLM\"] (structural)\n- model_type: RefinedWebModel -> falcon (structural)\n- generation bos_token_id: 1 -> 11 (tokenizer)\n- generation eos_token_id: 2 -> 11 (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/tiiuae/falcon-7b",
     "events": [
      {
       "introduced": "4e2d06f0a7c6370ebabbc30c6f59377ae8f73d76"
      }
     ]
    }
   ],
   "database_specific": {
    "model": "tiiuae/falcon-7b",
    "previous_revision": "2e3586947baae789afb6b8966bff3df919084bfb"
   }
  }
 ],
 "references": [
  {
   "type": "INTRODUCED",
   "url": "https://huggingface.co/tiiuae/falcon-7b/commit/4e2d06f0a7c6370ebabbc30c6f59377ae8f73d76"
  },
  {
   "type": "PACKAGE",
   "url": "https://huggingface.co/tiiuae/falcon-7b"
  },
  {
   "type": "WEB",
   "url": "https://www.neurarch.com/changes-feeds/models/tiiuae/falcon-7b.html"
  }
 ],
 "database_specific": {
  "source": "neurarch model change tracker",
  "model": "tiiuae/falcon-7b",
  "kind": "structural",
  "classes": [
   "structural",
   "tokenizer"
  ],
  "changed_keys": [
   {
    "file": "config",
    "key": "architectures",
    "before": [
     "RWForCausalLM"
    ],
    "after": [
     "FalconForCausalLM"
    ],
    "class": "structural"
   },
   {
    "file": "config",
    "key": "model_type",
    "before": "RefinedWebModel",
    "after": "falcon",
    "class": "structural"
   },
   {
    "file": "generation",
    "key": "bos_token_id",
    "before": 1,
    "after": 11,
    "class": "tokenizer"
   },
   {
    "file": "generation",
    "key": "eos_token_id",
    "before": 2,
    "after": 11,
    "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": 2,
    "after": 11
   },
   "bos": {
    "before": 1,
    "after": 11
   }
  },
  "commit_date": "2023-07-12T21:33:43.000Z",
  "detected_at": "2026-10-18T09:00:52.565Z",
  "detected_by": "backfill",
  "days_since_first_commit": 79,
  "license": "CC-BY-4.0"
 }
}