wip

libs/core/langchain_core/language_models/chat_models.py

@@ -219,6 +219,9 @@ class BaseChatModel(BaseLanguageModel[BaseMessage], ABC):
     - If False (default), will always use streaming case if available.
     """
 
+    coerce_input: bool = False
+    """"""
+
     @model_validator(mode="before")
     @classmethod
     def raise_deprecation(cls, values: dict) -> Any:
@@ -260,11 +263,11 @@ class BaseChatModel(BaseLanguageModel[BaseMessage], ABC):
 
     def _convert_input(self, input: LanguageModelInput) -> PromptValue:
         if isinstance(input, PromptValue):
-            return input
+            prompt_val = input
         elif isinstance(input, str):
-            return StringPromptValue(text=input)
+            prompt_val = StringPromptValue(text=input)
         elif isinstance(input, Sequence):
-            return ChatPromptValue(messages=convert_to_messages(input))
+            prompt_val = ChatPromptValue(messages=convert_to_messages(input))
         else:
             msg = (
                 f"Invalid input type {type(input)}. "
@@ -272,6 +275,15 @@ class BaseChatModel(BaseLanguageModel[BaseMessage], ABC):
             )
             raise ValueError(msg)
 
+        if self.coerce_input:
+            messages = prompt_val.to_messages()
+            return ChatPromptValue(messages=self._coerce_messages(messages))
+        else:
+            return prompt_val
+
+    def _coerce_messages(self, messages: list[BaseMessage]) -> list[BaseMessage]:
+        return messages
+
     def invoke(
         self,
         input: LanguageModelInput,

libs/core/langchain_core/messages/utils.py

@@ -880,6 +880,7 @@ def convert_to_openai_messages(
     messages: Union[MessageLikeRepresentation, Sequence[MessageLikeRepresentation]],
     *,
     text_format: Literal["string", "block"] = "string",
+    coerce: bool = False,
 ) -> Union[dict, list[dict]]:
     """Convert LangChain messages into OpenAI message dicts.
 
@@ -992,8 +993,14 @@ def convert_to_openai_messages(
                                 f"but is missing expected key(s) "
                                 f"{missing}. Full content block:\n\n{block}"
                             )
-                            raise ValueError(err)
+                            if not coerce:
-                        content.append({"type": block["type"], "text": block["text"]})
+                                raise ValueError(err)
+                            else:
+                                logger.warning(err)
+                                text = str({k: v for k, v in block.items() if k != "type"}) if len(block) > 1 else ""
+                        else:
+                            text = block["text"]
+                        content.append({"type": block["type"], "text": text})
                     elif block.get("type") == "image_url":
                         if missing := [k for k in ("image_url",) if k not in block]:
                             err = (
@@ -1002,7 +1009,10 @@ def convert_to_openai_messages(
                                 f"but is missing expected key(s) "
                                 f"{missing}. Full content block:\n\n{block}"
                             )
-                            raise ValueError(err)
+                            if not coerce:
+                                raise ValueError(err)
+                            else:
+                                continue
                         content.append(
                             {"type": "image_url", "image_url": block["image_url"]}
                         )
@@ -1021,7 +1031,10 @@ def convert_to_openai_messages(
                                     f"but 'source' is missing expected key(s) "
                                     f"{missing}. Full content block:\n\n{block}"
                                 )
-                                raise ValueError(err)
+                                if not coerce:
+                                    raise ValueError(err)
+                                else:
+                                    continue
                             content.append(
                                 {
                                     "type": "image_url",
@@ -1044,7 +1057,10 @@ def convert_to_openai_messages(
                                     f"but 'image' is missing expected key(s) "
                                     f"{missing}. Full content block:\n\n{block}"
                                 )
-                                raise ValueError(err)
+                                if not coerce:
+                                    raise ValueError(err)
+                                else:
+                                    continue
                             b64_image = _bytes_to_b64_str(image["source"]["bytes"])
                             content.append(
                                 {
@@ -1064,7 +1080,10 @@ def convert_to_openai_messages(
                                 f"but does not have a 'source' or 'image' key. Full "
                                 f"content block:\n\n{block}"
                             )
-                            raise ValueError(err)
+                            if not coerce:
+                                raise ValueError(err)
+                            else:
+                                continue
                     elif block.get("type") == "tool_use":
                         if missing := [
                             k for k in ("id", "name", "input") if k not in block
@@ -1075,7 +1094,10 @@ def convert_to_openai_messages(
                                 f"'tool_use', but is missing expected key(s) "
                                 f"{missing}. Full content block:\n\n{block}"
                             )
-                            raise ValueError(err)
+                            if not coerce:
+                                raise ValueError(err)
+                            else:
+                                continue
                         if not any(
                             tool_call["id"] == block["id"]
                             for tool_call in cast(AIMessage, message).tool_calls
@@ -1101,7 +1123,10 @@ def convert_to_openai_messages(
                                 f"'tool_result', but is missing expected key(s) "
                                 f"{missing}. Full content block:\n\n{block}"
                             )
-                            raise ValueError(msg)
+                            if not coerce:
+                                raise ValueError(msg)
+                            else:
+                                continue
                         tool_message = ToolMessage(
                             block["content"],
                             tool_call_id=block["tool_use_id"],
@@ -1121,7 +1146,10 @@ def convert_to_openai_messages(
                                 f"but does not have a 'json' key. Full "
                                 f"content block:\n\n{block}"
                             )
-                            raise ValueError(msg)
+                            if not coerce:
+                                raise ValueError(msg)
+                            else:
+                                continue
                         content.append(
                             {"type": "text", "text": json.dumps(block["json"])}
                         )

libs/partners/openai/langchain_openai/chat_models/base.py

@@ -61,7 +61,7 @@ from langchain_core.messages import (
     SystemMessageChunk,
     ToolCall,
     ToolMessage,
-    ToolMessageChunk,
+    ToolMessageChunk, convert_to_openai_messages, convert_to_messages,
 )
 from langchain_core.messages.ai import (
     InputTokenDetails,
@@ -860,6 +860,9 @@ class BaseChatOpenAI(BaseChatModel):
             None, self._create_chat_result, response, generation_info
         )
 
+    def _coerce_messages(self, messages: list[BaseMessage]) -> list[BaseMessage]:
+        return convert_to_messages(convert_to_openai_messages(messages))
+
     @property
     def _identifying_params(self) -> Dict[str, Any]:
         """Get the identifying parameters."""