Update ascend.py (#30060)

add batch_size to fix oom when embed large amount texts

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libs/community/langchain_community/embeddings/ascend.py

@@ -30,6 +30,7 @@ class AscendEmbeddings(Embeddings, BaseModel):
     document_instruction: str = ""
     use_fp16: bool = True
     pooling_method: Optional[str] = "cls"
+    batch_size: int = 32
     model: Any
     tokenizer: Any
 
@@ -119,7 +120,18 @@ class AscendEmbeddings(Embeddings, BaseModel):
             )
 
     def embed_documents(self, texts: List[str]) -> List[List[float]]:
-        return self.encode([self.document_instruction + text for text in texts])
+        try:
+            import numpy as np
+        except ImportError as e:
+            raise ImportError(
+                "Unable to import numpy, please install with `pip install -U numpy`."
+            ) from e
+        embedding_list = []
+        for i in range(0, len(texts), self.batch_size):
+            texts_ = texts[i : i + self.batch_size]
+            emb = self.encode([self.document_instruction + text for text in texts_])
+            embedding_list.append(emb)
+        return np.concatenate(embedding_list)
 
     def embed_query(self, text: str) -> List[float]:
         return self.encode([self.query_instruction + text])[0]