Does only openai support SystemMessage?

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Hello @estuday,

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Based on the information you've provided and the similar issues I found in the LangChain repository, it seems that not all models in the LangChain framework support the SystemMessage feature out of the box. The SystemMessage feature is part of the langchain_core.messages module and can be used across different models and agents in the LangChain framework. However, each model may require specific handling for SystemMessage types.

In your case, the ERNIE-Bot model is raising a TypeError with the message "Got unknown type {message}". This error is raised in the _convert_message_to_dict function when the message type is not one of the expected types (ChatMessage, HumanMessage, AIMessage). Here is the relevant code:

def _convert_message_to_dict(message: BaseMessage) -> dict:
    if isinstance(message, ChatMessage):
        message_dict = {"role": message.role, "content": message.content}
    elif isinstance(message, HumanMessage):
        message_dict = {"role": "user", "content": message.content}
    elif isinstance(message, AIMessage):
        message_dict = {"role": "assistant", "content": message.content}
    else:
        raise ValueError(f"Got unknown type {message}")
    return message_dict

To resolve this issue, you can modify the _convert_message_to_dict function in your ERNIE-Bot model to handle SystemMessage types. Here's an example of how you can do this:

def _convert_message_to_dict(message: BaseMessage) -> dict:
    ...
    elif isinstance(message, SystemMessage):
        message_dict = {"role": "system", "content": message.content}
    else:
        raise TypeError(f"Got unknown type {message}")
    ...
    return message_dict

This code checks if the message is an instance of SystemMessage. If it is, it creates a dictionary with the role set to "system" and the content set to the content of the message.

You can refer to the following solved issue for more details: chat_models.QianfanEndpoint Not Compatiable with SystemMessage

I hope this helps! If you have any other questions, feel free to ask.

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langchain-ai / langchain

Does only openai support SystemMessage? #13842

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