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Remove operator overloading for BaseMessage (#8245)

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This PR removes operator overloading for base message.

Removing the `+` operating from base message will help make sure that:

1) There's no need to re-define `+` for message chunks
2) That there's no unexpected behavior in terms of types changing
(adding two messages yields a ChatPromptTemplate which is not a message)
This commit is contained in:
Eugene Yurtsev
2023-07-25 15:12:19 -04:00
committed by GitHub
parent 30c2d3cd06
commit ec069381fb
1 changed files with 1 additions and 10 deletions
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11
libs/langchain/langchain/schema/messages.py
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@@ -1,15 +1,12 @@
from __future__ import annotations from __future__ import annotations
from abc import abstractmethod from abc import abstractmethod
from typing import TYPE_CHECKING, Any, List, Sequence from typing import List, Sequence
from pydantic import Field from pydantic import Field
from langchain.load.serializable import Serializable from langchain.load.serializable import Serializable
if TYPE_CHECKING:
from langchain.prompts.chat import ChatPromptTemplate
def get_buffer_string( def get_buffer_string(
messages: Sequence[BaseMessage], human_prefix: str = "Human", ai_prefix: str = "AI" messages: Sequence[BaseMessage], human_prefix: str = "Human", ai_prefix: str = "AI"
@@ -80,12 +77,6 @@ class BaseMessage(Serializable):
"""Whether this class is LangChain serializable.""" """Whether this class is LangChain serializable."""
return True return True
def __add__(self, other: Any) -> ChatPromptTemplate:
from langchain.prompts.chat import ChatPromptTemplate
prompt = ChatPromptTemplate(messages=[self])
return prompt + other
class HumanMessage(BaseMessage): class HumanMessage(BaseMessage):
"""A Message from a human.""" """A Message from a human."""