validate_llm_output() — langchain Function Reference

Architecture documentation for the validate_llm_output() function in map_rerank.py from the langchain codebase.

Function python AgentOrchestration ClassicChains

Entity Profile

AgentOrchestration→ ClassicChains→ validate_llm_output() — langchain Function Reference

Dependency Diagram

graph TD
  66907a22_1945_395e_6a94_37a8d00a56e2["validate_llm_output()"]
  ee80b7d6_d087_8cc2_13e6_51659dee89b4["MapRerankDocumentsChain"]
  66907a22_1945_395e_6a94_37a8d00a56e2 -->|defined in| ee80b7d6_d087_8cc2_13e6_51659dee89b4
  style 66907a22_1945_395e_6a94_37a8d00a56e2 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain/langchain_classic/chains/combine_documents/map_rerank.py lines 120–142

    def validate_llm_output(self) -> Self:
        """Validate that the combine chain outputs a dictionary."""
        output_parser = self.llm_chain.prompt.output_parser
        if not isinstance(output_parser, RegexParser):
            msg = (
                "Output parser of llm_chain should be a RegexParser,"
                f" got {output_parser}"
            )
            raise ValueError(msg)  # noqa: TRY004
        output_keys = output_parser.output_keys
        if self.rank_key not in output_keys:
            msg = (
                f"Got {self.rank_key} as key to rank on, but did not find "
                f"it in the llm_chain output keys ({output_keys})"
            )
            raise ValueError(msg)
        if self.answer_key not in output_keys:
            msg = (
                f"Got {self.answer_key} as key to return, but did not find "
                f"it in the llm_chain output keys ({output_keys})"
            )
            raise ValueError(msg)
        return self