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Code Issues Packages Projects Releases Wiki Activity

support messages in messages out (#20862)

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This commit is contained in:
Harrison Chase
2024-04-24 14:58:58 -07:00
committed by GitHub
parent a1614b88ac
commit 43c041cda5
2 changed files with 71 additions and 11 deletions
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42
libs/core/langchain_core/runnables/history.py
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@@ -25,6 +25,7 @@ from langchain_core.runnables.utils import (
)
if TYPE_CHECKING:
from langchain_core.language_models import LanguageModelLike
from langchain_core.messages import BaseMessage
from langchain_core.runnables.config import RunnableConfig
from langchain_core.tracers.schemas import Run
@@ -228,9 +229,12 @@ class RunnableWithMessageHistory(RunnableBindingBase):
def __init__(
self,
runnable: Runnable[
MessagesOrDictWithMessages,
Union[str, BaseMessage, MessagesOrDictWithMessages],
runnable: Union[
Runnable[
Union[MessagesOrDictWithMessages],
Union[str, BaseMessage, MessagesOrDictWithMessages],
],
LanguageModelLike,
],
get_session_history: GetSessionHistoryCallable,
*,
@@ -364,10 +368,19 @@ class RunnableWithMessageHistory(RunnableBindingBase):
return super_schema
def _get_input_messages(
self, input_val: Union[str, BaseMessage, Sequence[BaseMessage]]
self, input_val: Union[str, BaseMessage, Sequence[BaseMessage], dict]
) -> List[BaseMessage]:
from langchain_core.messages import BaseMessage
if isinstance(input_val, dict):
if self.input_messages_key:
key = self.input_messages_key
elif len(input_val) == 1:
key = list(input_val.keys())[0]
else:
key = "input"
input_val = input_val[key]
if isinstance(input_val, str):
from langchain_core.messages import HumanMessage
@@ -388,7 +401,18 @@ class RunnableWithMessageHistory(RunnableBindingBase):
from langchain_core.messages import BaseMessage
if isinstance(output_val, dict):
output_val = output_val[self.output_messages_key or "output"]
if self.output_messages_key:
key = self.output_messages_key
elif len(output_val) == 1:
key = list(output_val.keys())[0]
else:
key = "output"
# If you are wrapping a chat model directly
# The output is actually this weird generations object
if key not in output_val and "generations" in output_val:
output_val = output_val["generations"][0][0]["message"]
else:
output_val = output_val[key]
if isinstance(output_val, str):
from langchain_core.messages import AIMessage
@@ -407,10 +431,7 @@ class RunnableWithMessageHistory(RunnableBindingBase):
if not self.history_messages_key:
# return all messages
input_val = (
input if not self.input_messages_key else input[self.input_messages_key]
)
messages += self._get_input_messages(input_val)
messages += self._get_input_messages(input)
return messages
async def _aenter_history(
@@ -432,8 +453,7 @@ class RunnableWithMessageHistory(RunnableBindingBase):
# Get the input messages
inputs = load(run.inputs)
input_val = inputs[self.input_messages_key or "input"]
input_messages = self._get_input_messages(input_val)
input_messages = self._get_input_messages(inputs)
# If historic messages were prepended to the input messages, remove them to
# avoid adding duplicate messages to history.