{
 "schema_version": "1.7.0",
 "id": "x_NXMC-2025-0201",
 "modified": "2026-11-09T14:19:48.659Z",
 "published": "2026-11-09T14:19:48.659Z",
 "summary": "Qwen3-Reranker-0.6B-seq-cls: structural change at 395ad23 (2025-06-06)",
 "details": "Qwen3-Reranker-0.6B-seq-cls: architectures [\"Qwen3ForCausalLM\"] to [\"Qwen3ForSequenceClassification\"]; a different class is instantiated from the same id; declared dtype \"bfloat16\" to \"float32\"; config.json pad_token_id unset to 151643; the tokenizer's pad token, which training pads with, did not change (2025-06-06).\n\nRepository: https://huggingface.co/tomaarsen/Qwen3-Reranker-0.6B-seq-cls. Revisions from 395ad236c61044c8946840151714a0e64a9d7080 onward carry this change; a pin at adcdb2a1a4b2d28ce7e140b30d016b2ad5377730 or earlier does not.\n\nChanged keys:\n- architectures: [\"Qwen3ForCausalLM\"] -> [\"Qwen3ForSequenceClassification\"] (structural)\n- dtype: bfloat16 -> float32 (structural)\n- pad_token_id: unset -> 151643 (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/tomaarsen/Qwen3-Reranker-0.6B-seq-cls",
     "events": [
      {
       "introduced": "395ad236c61044c8946840151714a0e64a9d7080"
      }
     ]
    }
   ],
   "database_specific": {
    "model": "tomaarsen/Qwen3-Reranker-0.6B-seq-cls",
    "previous_revision": "adcdb2a1a4b2d28ce7e140b30d016b2ad5377730"
   }
  }
 ],
 "references": [
  {
   "type": "INTRODUCED",
   "url": "https://huggingface.co/tomaarsen/Qwen3-Reranker-0.6B-seq-cls/commit/395ad236c61044c8946840151714a0e64a9d7080"
  },
  {
   "type": "PACKAGE",
   "url": "https://huggingface.co/tomaarsen/Qwen3-Reranker-0.6B-seq-cls"
  },
  {
   "type": "WEB",
   "url": "https://www.neurarch.com/changes-feeds/models/tomaarsen/Qwen3-Reranker-0.6B-seq-cls.html"
  }
 ],
 "database_specific": {
  "source": "neurarch model change tracker",
  "model": "tomaarsen/Qwen3-Reranker-0.6B-seq-cls",
  "kind": "structural",
  "classes": [
   "structural",
   "tokenizer"
  ],
  "changed_keys": [
   {
    "file": "config",
    "key": "architectures",
    "before": [
     "Qwen3ForCausalLM"
    ],
    "after": [
     "Qwen3ForSequenceClassification"
    ],
    "class": "structural"
   },
   {
    "file": "config",
    "key": "dtype",
    "before": "bfloat16",
    "after": "float32",
    "class": "structural"
   },
   {
    "file": "config",
    "key": "pad_token_id",
    "before": null,
    "after": 151643,
    "class": "tokenizer"
   }
  ],
  "impact": {
   "memory": true,
   "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,
   "derivedSame": true,
   "generationEos": [
    151645,
    151643
   ]
  },
  "commit_date": "2025-06-06T16:37:24.000Z",
  "detected_at": "2026-11-09T14:19:48.659Z",
  "detected_by": "backfill",
  "days_since_first_commit": 8,
  "license": "CC-BY-4.0"
 }
}