Supported custom ernie_api_base & Implemented asynchronous for ErnieEmbeddings (#10398)

Description: Supported custom ernie_api_base & Implemented asynchronous
for ErnieEmbeddings
 - ernie_api_base：Support Ernie Service custom endpoints
 - Support asynchronous 

Issue: None
Dependencies: None
Tag maintainer:
Twitter handle: @JohnMai95

libs/langchain/langchain/embeddings/ernie.py

@@ -1,5 +1,7 @@
+import asyncio
 import logging
 import threading
+from functools import partial
 from typing import Dict, List, Optional
 
 import requests
@@ -14,6 +16,7 @@ logger = logging.getLogger(__name__)
 class ErnieEmbeddings(BaseModel, Embeddings):
     """`Ernie Embeddings V1` embedding models."""
 
+    ernie_api_base: Optional[str] = None
     ernie_client_id: Optional[str] = None
     ernie_client_secret: Optional[str] = None
     access_token: Optional[str] = None
@@ -26,6 +29,9 @@ class ErnieEmbeddings(BaseModel, Embeddings):
 
     @root_validator()
     def validate_environment(cls, values: Dict) -> Dict:
+        values["ernie_api_base"] = get_from_dict_or_env(
+            values, "ernie_api_base", "ERNIE_API_BASE", "https://aip.baidubce.com"
+        )
         values["ernie_client_id"] = get_from_dict_or_env(
             values,
             "ernie_client_id",
@@ -40,7 +46,7 @@ class ErnieEmbeddings(BaseModel, Embeddings):
 
     def _embedding(self, json: object) -> dict:
         base_url = (
-            "https://aip.baidubce.com/rpc/2.0/ai_custom/v1/wenxinworkshop/embeddings"
+            f"{self.ernie_api_base}/rpc/2.0/ai_custom/v1/wenxinworkshop/embeddings"
         )
         resp = requests.post(
             f"{base_url}/embedding-v1",
@@ -71,6 +77,15 @@ class ErnieEmbeddings(BaseModel, Embeddings):
             self.access_token = str(resp.json().get("access_token"))
 
     def embed_documents(self, texts: List[str]) -> List[List[float]]:
+        """Embed search docs.
+
+        Args:
+            texts: The list of texts to embed
+
+        Returns:
+            List[List[float]]: List of embeddings, one for each text.
+        """
+
         if not self.access_token:
             self._refresh_access_token_with_lock()
         text_in_chunks = [
@@ -90,6 +105,15 @@ class ErnieEmbeddings(BaseModel, Embeddings):
         return lst
 
     def embed_query(self, text: str) -> List[float]:
+        """Embed query text.
+
+        Args:
+            text: The text to embed.
+
+        Returns:
+            List[float]: Embeddings for the text.
+        """
+
         if not self.access_token:
             self._refresh_access_token_with_lock()
         resp = self._embedding({"input": [text]})
@@ -100,3 +124,31 @@ class ErnieEmbeddings(BaseModel, Embeddings):
             else:
                 raise ValueError(f"Error from Ernie: {resp}")
         return resp["data"][0]["embedding"]
+
+    async def aembed_query(self, text: str) -> List[float]:
+        """Asynchronous Embed query text.
+
+        Args:
+            text: The text to embed.
+
+        Returns:
+            List[float]: Embeddings for the text.
+        """
+
+        return await asyncio.get_running_loop().run_in_executor(
+            None, partial(self.embed_query, text)
+        )
+
+    async def aembed_documents(self, texts: List[str]) -> List[List[float]]:
+        """Asynchronous Embed search docs.
+
+        Args:
+            texts: The list of texts to embed
+
+        Returns:
+            List[List[float]]: List of embeddings, one for each text.
+        """
+
+        result = await asyncio.gather(*[self.aembed_query(text) for text in texts])
+
+        return list(result)