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langchain[patch]: fix BaseChatMemory get output data error with extra key (#18117)

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**Description:** At times, BaseChatMemory._get_input_output may acquire
some extra keys such as 'intermediate_steps' (agent_executor with
return_intermediate_steps set to True) and 'messages'
(agent_executor.iter with memory). In these instances, _get_input_output
can raise an error due to the presence of multiple keys. The 'output'
field should be used as the default field in these cases.
**Issue:** #16791
This commit is contained in:
xiaohuanshu 2024-03-29 07:38:08 +08:00 committed by GitHub
parent f5e84c8858
commit ecb11a4a32
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1 changed files with 16 additions and 3 deletions
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19
libs/langchain/langchain/memory/chat_memory.py
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@ -1,3 +1,4 @@
import warnings
from abc import ABC
from typing import Any, Dict, Optional, Tuple
@ -26,9 +27,21 @@ class BaseChatMemory(BaseMemory, ABC):
else:
prompt_input_key = self.input_key
if self.output_key is None:
if len(outputs) != 1:
raise ValueError(f"One output key expected, got {outputs.keys()}")
output_key = list(outputs.keys())[0]
if len(outputs) == 1:
output_key = list(outputs.keys())[0]
elif "output" in outputs:
output_key = "output"
warnings.warn(
f"'{self.__class__.__name__}' got multiple output keys:"
f" {outputs.keys()}. The default 'output' key is being used."
f" If this is not desired, please manually set 'output_key'."
)
else:
raise ValueError(
f"Got multiple output keys: {outputs.keys()}, cannot "
f"determine which to store in memory. Please set the "
f"'output_key' explicitly."
)
else:
output_key = self.output_key
return inputs[prompt_input_key], outputs[output_key]