fix `ChatOpenAI.agenerate` (#1504)

langchain/chat_models/base.py

@@ -46,17 +46,14 @@ class BaseChatModel(BaseLanguageModel, BaseModel, ABC):
         self, messages: List[List[BaseMessage]], stop: Optional[List[str]] = None
     ) -> LLMResult:
         """Top Level call"""
-        results = []
-        for m in messages:
-            results.append(self._generate(m, stop=stop))
+        results = [self._generate(m, stop=stop) for m in messages]
         return LLMResult(generations=[res.generations for res in results])
 
     async def agenerate(
         self, messages: List[List[BaseMessage]], stop: Optional[List[str]] = None
     ) -> LLMResult:
-        results = []
-        for m in messages:
-            results.append(self._generate(m, stop=stop))
+        """Top Level call"""
+        results = [await self._agenerate(m, stop=stop) for m in messages]
         return LLMResult(generations=[res.generations for res in results])
 
     def generate_prompt(

langchain/chat_models/openai.py

@@ -3,7 +3,7 @@ from __future__ import annotations
 
 import logging
 import sys
-from typing import Any, Callable, Dict, List, Mapping, Optional
+from typing import Any, Callable, Dict, List, Mapping, Optional, Tuple
 
 from pydantic import BaseModel, Extra, Field, root_validator
 from tenacity import (
@@ -91,6 +91,15 @@ def _convert_message_to_dict(message: BaseMessage) -> dict:
     return message_dict
 
 
+def _create_chat_result(response: Mapping[str, Any]) -> ChatResult:
+    generations = []
+    for res in response["choices"]:
+        message = _convert_dict_to_message(res["message"])
+        gen = ChatGeneration(message=message)
+        generations.append(gen)
+    return ChatResult(generations=generations)
+
+
 class ChatOpenAI(BaseChatModel, BaseModel):
     """Wrapper around OpenAI Chat large language models.
 
@@ -215,12 +224,7 @@ class ChatOpenAI(BaseChatModel, BaseModel):
     def _generate(
         self, messages: List[BaseMessage], stop: Optional[List[str]] = None
     ) -> ChatResult:
-        params: Dict[str, Any] = {**{"model": self.model_name}, **self._default_params}
-        if stop is not None:
-            if "stop" in params:
-                raise ValueError("`stop` found in both the input and default params.")
-            params["stop"] = stop
-        message_dicts = [_convert_message_to_dict(m) for m in messages]
+        message_dicts, params = self._create_message_dicts(messages, stop)
         if self.streaming:
             inner_completion = ""
             role = "assistant"
@@ -240,22 +244,23 @@ class ChatOpenAI(BaseChatModel, BaseModel):
             )
             return ChatResult(generations=[ChatGeneration(message=message)])
         response = self.completion_with_retry(messages=message_dicts, **params)
-        generations = []
-        for res in response["choices"]:
-            message = _convert_dict_to_message(res["message"])
-            gen = ChatGeneration(message=message)
-            generations.append(gen)
-        return ChatResult(generations=generations)
+        return _create_chat_result(response)
 
-    async def _agenerate(
-        self, messages: List[BaseMessage], stop: Optional[List[str]] = None
-    ) -> ChatResult:
+    def _create_message_dicts(
+        self, messages: List[BaseMessage], stop: Optional[List[str]]
+    ) -> Tuple[List[Dict[str, Any]], Dict[str, Any]]:
         params: Dict[str, Any] = {**{"model": self.model_name}, **self._default_params}
         if stop is not None:
             if "stop" in params:
                 raise ValueError("`stop` found in both the input and default params.")
             params["stop"] = stop
         message_dicts = [_convert_message_to_dict(m) for m in messages]
+        return message_dicts, params
+
+    async def _agenerate(
+        self, messages: List[BaseMessage], stop: Optional[List[str]] = None
+    ) -> ChatResult:
+        message_dicts, params = self._create_message_dicts(messages, stop)
         if self.streaming:
             inner_completion = ""
             role = "assistant"
@@ -281,15 +286,10 @@ class ChatOpenAI(BaseChatModel, BaseModel):
             )
             return ChatResult(generations=[ChatGeneration(message=message)])
         else:
-            full_response = await acompletion_with_retry(
+            response = await acompletion_with_retry(
                 self, messages=message_dicts, **params
             )
-            generations = []
-            for res in full_response["choices"]:
-                message = _convert_dict_to_message(res["message"])
-                gen = ChatGeneration(message=message)
-                generations.append(gen)
-            return ChatResult(generations=generations)
+            return _create_chat_result(response)
 
     @property
     def _identifying_params(self) -> Mapping[str, Any]:

tests/integration_tests/chat_models/test_openai.py

@@ -87,3 +87,44 @@ def test_chat_openai_invalid_streaming_params() -> None:
             temperature=0,
             n=5,
         )
+
+
+@pytest.mark.asyncio
+async def test_async_chat_openai() -> None:
+    """Test async generation."""
+    chat = ChatOpenAI(max_tokens=10, n=2)
+    message = HumanMessage(content="Hello")
+    response = await chat.agenerate([[message], [message]])
+    assert isinstance(response, LLMResult)
+    assert len(response.generations) == 2
+    for generations in response.generations:
+        assert len(generations) == 2
+        for generation in generations:
+            assert isinstance(generation, ChatGeneration)
+            assert isinstance(generation.text, str)
+            assert generation.text == generation.message.content
+
+
+@pytest.mark.asyncio
+async def test_async_chat_openai_streaming() -> None:
+    """Test that streaming correctly invokes on_llm_new_token callback."""
+    callback_handler = FakeCallbackHandler()
+    callback_manager = CallbackManager([callback_handler])
+    chat = ChatOpenAI(
+        max_tokens=10,
+        streaming=True,
+        temperature=0,
+        callback_manager=callback_manager,
+        verbose=True,
+    )
+    message = HumanMessage(content="Hello")
+    response = await chat.agenerate([[message], [message]])
+    assert callback_handler.llm_streams > 0
+    assert isinstance(response, LLMResult)
+    assert len(response.generations) == 2
+    for generations in response.generations:
+        assert len(generations) == 1
+        for generation in generations:
+            assert isinstance(generation, ChatGeneration)
+            assert isinstance(generation.text, str)
+            assert generation.text == generation.message.content

tests/integration_tests/llms/test_openai.py

@@ -54,7 +54,7 @@ def test_openai_stop_error() -> None:
 
 
 def test_saving_loading_llm(tmp_path: Path) -> None:
-    """Test saving/loading an OpenAPI LLM."""
+    """Test saving/loading an OpenAI LLM."""
     llm = OpenAI(max_tokens=10)
     llm.save(file_path=tmp_path / "openai.yaml")
     loaded_llm = load_llm(tmp_path / "openai.yaml")