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FakeCallbackHandlerWithChatStart Class — langchain Architecture

Architecture documentation for the FakeCallbackHandlerWithChatStart class in callbacks.py from the langchain codebase.

Class python

Entity Profile

Dependency Diagram

graph TD
  02988c67_bd5d_7cba_92df_27b446da7ff1["FakeCallbackHandlerWithChatStart"]
  8adec285_7535_1bed_5947_2a523043e071["FakeCallbackHandler"]
  02988c67_bd5d_7cba_92df_27b446da7ff1 -->|extends| 8adec285_7535_1bed_5947_2a523043e071
  b9553aad_b797_0a7b_73ed_8d05b0819c0f["BaseMessage"]
  02988c67_bd5d_7cba_92df_27b446da7ff1 -->|extends| b9553aad_b797_0a7b_73ed_8d05b0819c0f
  07deddc6_bb63_0758_8452_6935ef3e67d6["callbacks.py"]
  02988c67_bd5d_7cba_92df_27b446da7ff1 -->|defined in| 07deddc6_bb63_0758_8452_6935ef3e67d6
  79030333_5a66_4510_ef8e_5a374021c531["on_chat_model_start()"]
  02988c67_bd5d_7cba_92df_27b446da7ff1 -->|method| 79030333_5a66_4510_ef8e_5a374021c531

Relationship Graph

Source Code

libs/core/tests/unit_tests/fake/callbacks.py lines 283–295

class FakeCallbackHandlerWithChatStart(FakeCallbackHandler):
    @override
    def on_chat_model_start(
        self,
        serialized: dict[str, Any],
        messages: list[list[BaseMessage]],
        *,
        run_id: UUID,
        parent_run_id: UUID | None = None,
        **kwargs: Any,
    ) -> Any:
        assert all(isinstance(m, BaseMessage) for m in chain(*messages))
        self.on_chat_model_start_common()

Defined In

Extends

Source

Frequently Asked Questions

What is the FakeCallbackHandlerWithChatStart class?
FakeCallbackHandlerWithChatStart is a class in the langchain codebase, defined in libs/core/tests/unit_tests/fake/callbacks.py.
Where is FakeCallbackHandlerWithChatStart defined?
FakeCallbackHandlerWithChatStart is defined in libs/core/tests/unit_tests/fake/callbacks.py at line 283.
What does FakeCallbackHandlerWithChatStart extend?
FakeCallbackHandlerWithChatStart extends FakeCallbackHandler, BaseMessage.

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