Fix: local variable issue. (#9255)

### What problem does this PR solve?

#9227

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

rag/llm/cv_model.py

             yield response.usage_metadata.total_token_count
         else:
             yield 0
+            
 
 class NvidiaCV(Base):
     _FACTORY_NAME = "NVIDIA"

rag/svr/task_executor.py

     return settings.docStoreConn.createIdx(idxnm, row.get("kb_id", ""), vector_size)
 
 
-@timeout(60*20)
 async def embedding(docs, mdl, parser_config=None, callback=None):
     if parser_config is None:
         parser_config = {}
         tts = np.concatenate([vts for _ in range(len(tts))], axis=0)
         tk_count += c
 
+    @timeout(5)
+    def batch_encode(txts):
+        nonlocal mdl
+        return mdl.encode([truncate(c, mdl.max_length-10) for c in txts])
+
     cnts_ = np.array([])
     for i in range(0, len(cnts), EMBEDDING_BATCH_SIZE):
         async with embed_limiter:
-            vts, c = await trio.to_thread.run_sync(lambda: mdl.encode([truncate(c, mdl.max_length-10) for c in cnts[i: i + EMBEDDING_BATCH_SIZE]]))
+            vts, c = await trio.to_thread.run_sync(lambda: batch_encode(cnts[i: i + EMBEDDING_BATCH_SIZE]))
         if len(cnts_) == 0:
             cnts_ = vts
         else: