SummarizerMixin Class — langchain Architecture
Architecture documentation for the SummarizerMixin class in summary.py from the langchain codebase.
Entity Profile
Dependency Diagram
graph TD b59972c7_2658_48b0_f600_7b1f592481af["SummarizerMixin"] 3460fa37_4fa8_1998_2c3c_01d1d3814b73["summary.py"] b59972c7_2658_48b0_f600_7b1f592481af -->|defined in| 3460fa37_4fa8_1998_2c3c_01d1d3814b73 440abe33_20df_ee02_d771_d5bb5d39241f["predict_new_summary()"] b59972c7_2658_48b0_f600_7b1f592481af -->|method| 440abe33_20df_ee02_d771_d5bb5d39241f bd542e1b_cbff_eace_acc7_16110f14f487["apredict_new_summary()"] b59972c7_2658_48b0_f600_7b1f592481af -->|method| bd542e1b_cbff_eace_acc7_16110f14f487
Relationship Graph
Source Code
libs/langchain/langchain_classic/memory/summary.py lines 27–80
class SummarizerMixin(BaseModel):
"""Mixin for summarizer."""
human_prefix: str = "Human"
ai_prefix: str = "AI"
llm: BaseLanguageModel
prompt: BasePromptTemplate = SUMMARY_PROMPT
summary_message_cls: type[BaseMessage] = SystemMessage
def predict_new_summary(
self,
messages: list[BaseMessage],
existing_summary: str,
) -> str:
"""Predict a new summary based on the messages and existing summary.
Args:
messages: List of messages to summarize.
existing_summary: Existing summary to build upon.
Returns:
A new summary string.
"""
new_lines = get_buffer_string(
messages,
human_prefix=self.human_prefix,
ai_prefix=self.ai_prefix,
)
chain = LLMChain(llm=self.llm, prompt=self.prompt)
return chain.predict(summary=existing_summary, new_lines=new_lines)
async def apredict_new_summary(
self,
messages: list[BaseMessage],
existing_summary: str,
) -> str:
"""Predict a new summary based on the messages and existing summary.
Args:
messages: List of messages to summarize.
existing_summary: Existing summary to build upon.
Returns:
A new summary string.
"""
new_lines = get_buffer_string(
messages,
human_prefix=self.human_prefix,
ai_prefix=self.ai_prefix,
)
chain = LLMChain(llm=self.llm, prompt=self.prompt)
return await chain.apredict(summary=existing_summary, new_lines=new_lines)Source
Frequently Asked Questions
What is the SummarizerMixin class?
SummarizerMixin is a class in the langchain codebase, defined in libs/langchain/langchain_classic/memory/summary.py.
Where is SummarizerMixin defined?
SummarizerMixin is defined in libs/langchain/langchain_classic/memory/summary.py at line 27.
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