_call() — langchain Function Reference

Architecture documentation for the _call() function in base.py from the langchain codebase.

Function python AgentOrchestration ClassicChains calls 2

Entity Profile

AgentOrchestration→ ClassicChains→ _call() — langchain Function Reference

Dependency Diagram

graph TD
  39b2c44c_a865_2cd7_07db_5daf7ba84304["_call()"]
  1cb458d9_f8c6_d78d_c1e3_79a8b3106c08["BaseRetrievalQA"]
  39b2c44c_a865_2cd7_07db_5daf7ba84304 -->|defined in| 1cb458d9_f8c6_d78d_c1e3_79a8b3106c08
  811cffbd_8a9c_6a62_d725_9323fb07755c["_get_docs()"]
  39b2c44c_a865_2cd7_07db_5daf7ba84304 -->|calls| 811cffbd_8a9c_6a62_d725_9323fb07755c
  76742b46_481d_4a3f_d102_75a96ccd6564["_get_docs()"]
  39b2c44c_a865_2cd7_07db_5daf7ba84304 -->|calls| 76742b46_481d_4a3f_d102_75a96ccd6564
  style 39b2c44c_a865_2cd7_07db_5daf7ba84304 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain/langchain_classic/chains/retrieval_qa/base.py lines 129–162

    def _call(
        self,
        inputs: dict[str, Any],
        run_manager: CallbackManagerForChainRun | None = None,
    ) -> dict[str, Any]:
        """Run get_relevant_text and llm on input query.

        If chain has 'return_source_documents' as 'True', returns
        the retrieved documents as well under the key 'source_documents'.

        Example:
        ```python
        res = indexqa({"query": "This is my query"})
        answer, docs = res["result"], res["source_documents"]
        ```
        """
        _run_manager = run_manager or CallbackManagerForChainRun.get_noop_manager()
        question = inputs[self.input_key]
        accepts_run_manager = (
            "run_manager" in inspect.signature(self._get_docs).parameters
        )
        if accepts_run_manager:
            docs = self._get_docs(question, run_manager=_run_manager)
        else:
            docs = self._get_docs(question)  # type: ignore[call-arg]
        answer = self.combine_documents_chain.run(
            input_documents=docs,
            question=question,
            callbacks=_run_manager.get_child(),
        )

        if self.return_source_documents:
            return {self.output_key: answer, "source_documents": docs}
        return {self.output_key: answer}