{
 "schema_version": "1.7.0",
 "id": "x_NXMC-2025-0020",
 "modified": "2026-10-19T02:33:38.839Z",
 "published": "2026-10-18T09:00:52.565Z",
 "summary": "Giga-Embeddings-instruct: structural change at b3dc287 (2025-09-23)",
 "details": "Giga-Embeddings-instruct: head dim 128 to 64, KV heads 2 to 16; derived parameters 3.30B to 2.50B (-801.0M, -1.60 GB of bf16 weights); rope_theta 1300 to 100000; every position embedding changes (2025-09-23).\n\nRepository: https://huggingface.co/ai-sage/Giga-Embeddings-instruct. Revisions from b3dc287fece8fcb002a9bc02138818b6fdc0b9b8 onward carry this change; a pin at f4891741cf49fc2e724a14188470cd57c39fec93 or earlier does not.\n\nChanged keys:\n- dtype: float32 -> bfloat16 (structural)\n- head_dim: 128 -> 64 (structural)\n- model_type: gigarembed -> gigar (structural)\n- num_key_value_heads: 2 -> 16 (structural)\n- rope_theta: 1300 -> 100000 (structural)\n- tokenizer chat_template_sha256: unset -> ee5407800568eadf (template)\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/ai-sage/Giga-Embeddings-instruct",
     "events": [
      {
       "introduced": "b3dc287fece8fcb002a9bc02138818b6fdc0b9b8"
      }
     ]
    }
   ],
   "database_specific": {
    "model": "ai-sage/Giga-Embeddings-instruct",
    "previous_revision": "f4891741cf49fc2e724a14188470cd57c39fec93"
   }
  }
 ],
 "references": [
  {
   "type": "INTRODUCED",
   "url": "https://huggingface.co/ai-sage/Giga-Embeddings-instruct/commit/b3dc287fece8fcb002a9bc02138818b6fdc0b9b8"
  },
  {
   "type": "PACKAGE",
   "url": "https://huggingface.co/ai-sage/Giga-Embeddings-instruct"
  },
  {
   "type": "WEB",
   "url": "https://www.neurarch.com/changes-feeds/models/ai-sage/Giga-Embeddings-instruct.html"
  }
 ],
 "database_specific": {
  "source": "neurarch model change tracker",
  "model": "ai-sage/Giga-Embeddings-instruct",
  "kind": "structural",
  "classes": [
   "structural",
   "template"
  ],
  "changed_keys": [
   {
    "file": "config",
    "key": "dtype",
    "before": "float32",
    "after": "bfloat16",
    "class": "structural"
   },
   {
    "file": "config",
    "key": "head_dim",
    "before": 128,
    "after": 64,
    "class": "structural"
   },
   {
    "file": "config",
    "key": "model_type",
    "before": "gigarembed",
    "after": "gigar",
    "class": "structural"
   },
   {
    "file": "config",
    "key": "num_key_value_heads",
    "before": 2,
    "after": 16,
    "class": "structural"
   },
   {
    "file": "config",
    "key": "rope_theta",
    "before": 1300,
    "after": 100000,
    "class": "structural"
   },
   {
    "file": "tokenizer",
    "key": "chat_template_sha256",
    "before": null,
    "after": "ee5407800568eadf",
    "class": "template"
   }
  ],
  "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": {
    "before": 3300146432,
    "after": 2499144704
   },
   "weightsGbBf16": {
    "before": 6.6,
    "after": 4.998
   },
   "trainPeakGb": {
    "before": 375.903,
    "after": 248.184
   },
   "fingerprint": {
    "before": "87540c74",
    "after": "be837245"
   },
   "context": null,
   "eos": null,
   "bos": null
  },
  "commit_date": "2025-09-23T10:38:32.000Z",
  "detected_at": "2026-10-18T09:00:52.565Z",
  "detected_by": "backfill",
  "days_since_first_commit": 284,
  "license": "CC-BY-4.0"
 }
}