{
 "schema_version": "1.7.0",
 "id": "x_NXMC-2025-0068",
 "modified": "2026-10-19T02:33:38.839Z",
 "published": "2026-10-18T09:00:52.565Z",
 "summary": "ultravox-v0_5-llama-3_2-1b: structural change at f27f705 (2025-02-07)",
 "details": "ultravox-v0_5-llama-3_2-1b: attention heads unset to 32; derived parameters 2.42B to 2.42B (+786.4K, +0.00 GB of bf16 weights) (2025-02-07).\n\nRepository: https://huggingface.co/fixie-ai/ultravox-v0_5-llama-3_2-1b. Revisions from f27f705716a3aebde26fed3e3f1966e99f4a59c6 onward carry this change; a pin at a5eeb6d7918b59338df8dcefb9a95d7e0d16193a or earlier does not.\n\nChanged keys:\n- num_attention_heads: unset -> 32 (structural)\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/fixie-ai/ultravox-v0_5-llama-3_2-1b",
     "events": [
      {
       "introduced": "f27f705716a3aebde26fed3e3f1966e99f4a59c6"
      }
     ]
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   ],
   "database_specific": {
    "model": "fixie-ai/ultravox-v0_5-llama-3_2-1b",
    "previous_revision": "a5eeb6d7918b59338df8dcefb9a95d7e0d16193a"
   }
  }
 ],
 "references": [
  {
   "type": "INTRODUCED",
   "url": "https://huggingface.co/fixie-ai/ultravox-v0_5-llama-3_2-1b/commit/f27f705716a3aebde26fed3e3f1966e99f4a59c6"
  },
  {
   "type": "PACKAGE",
   "url": "https://huggingface.co/fixie-ai/ultravox-v0_5-llama-3_2-1b"
  },
  {
   "type": "WEB",
   "url": "https://www.neurarch.com/changes-feeds/models/fixie-ai/ultravox-v0_5-llama-3_2-1b.html"
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 ],
 "database_specific": {
  "source": "neurarch model change tracker",
  "model": "fixie-ai/ultravox-v0_5-llama-3_2-1b",
  "kind": "structural",
  "classes": [
   "structural"
  ],
  "changed_keys": [
   {
    "file": "config",
    "key": "num_attention_heads",
    "before": null,
    "after": 32,
    "class": "structural"
   }
  ],
  "impact": {
   "memory": true,
   "serving": false,
   "tokenizer": false,
   "licence": null
  },
  "breaking": true,
  "breaking_rule": "https://www.neurarch.com/changes-feeds/advisories/index.json#breaking_rule",
  "consequence": {
   "params": {
    "before": 2417947904,
    "after": 2418734336
   },
   "weightsGbBf16": {
    "before": 4.836,
    "after": 4.837
   },
   "trainPeakGb": {
    "before": 79.525,
    "after": 79.553
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   "fingerprint": null,
   "context": null,
   "eos": null,
   "bos": null
  },
  "commit_date": "2025-02-07T00:23:10.000Z",
  "detected_at": "2026-10-18T09:00:52.565Z",
  "detected_by": "backfill",
  "days_since_first_commit": 0,
  "license": "CC-BY-4.0"
 }
}