_call() — langchain Function Reference

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

Function python AgentOrchestration ClassicChains calls 1 called by 1

Entity Profile

AgentOrchestration→ ClassicChains→ _call() — langchain Function Reference

Dependency Diagram

graph TD
  36348bf6_4ec4_a0d7_3590_010c39d13c55["_call()"]
  d01877d8_1123_f550_8a2f_0981eecde24e["SimpleSequentialChain"]
  36348bf6_4ec4_a0d7_3590_010c39d13c55 -->|defined in| d01877d8_1123_f550_8a2f_0981eecde24e
  b66566fe_04a3_9200_5ef2_c270b021325d["_call()"]
  b66566fe_04a3_9200_5ef2_c270b021325d -->|calls| 36348bf6_4ec4_a0d7_3590_010c39d13c55
  b66566fe_04a3_9200_5ef2_c270b021325d["_call()"]
  36348bf6_4ec4_a0d7_3590_010c39d13c55 -->|calls| b66566fe_04a3_9200_5ef2_c270b021325d
  style 36348bf6_4ec4_a0d7_3590_010c39d13c55 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain/langchain_classic/chains/sequential.py lines 164–185

    def _call(
        self,
        inputs: dict[str, str],
        run_manager: CallbackManagerForChainRun | None = None,
    ) -> dict[str, str]:
        _run_manager = run_manager or CallbackManagerForChainRun.get_noop_manager()
        _input = inputs[self.input_key]
        color_mapping = get_color_mapping([str(i) for i in range(len(self.chains))])
        for i, chain in enumerate(self.chains):
            _input = chain.run(
                _input,
                callbacks=_run_manager.get_child(f"step_{i + 1}"),
            )
            if self.strip_outputs:
                _input = _input.strip()
            _run_manager.on_text(
                _input,
                color=color_mapping[str(i)],
                end="\n",
                verbose=self.verbose,
            )
        return {self.output_key: _input}