FakeTracer Class — langchain Architecture

Architecture documentation for the FakeTracer class in test_chat_models.py from the langchain codebase.

Class python

Entity Profile

Dependency Diagram

graph TD
  d392ee3c_2b59_0f60_2e4d_0c597bd9e905["FakeTracer"]
  0f6b3261_31fa_c34e_ca33_cb141bdf78ff["BaseTracer"]
  d392ee3c_2b59_0f60_2e4d_0c597bd9e905 -->|extends| 0f6b3261_31fa_c34e_ca33_cb141bdf78ff
  18428dc5_a41b_90c6_88ad_615296ee3311["test_chat_models.py"]
  d392ee3c_2b59_0f60_2e4d_0c597bd9e905 -->|defined in| 18428dc5_a41b_90c6_88ad_615296ee3311
  55ad7d0f_14fe_d8dc_7169_6a757ad61518["__init__()"]
  d392ee3c_2b59_0f60_2e4d_0c597bd9e905 -->|method| 55ad7d0f_14fe_d8dc_7169_6a757ad61518
  4a92c221_786f_ad18_9a0e_ae66d8e29f5c["_persist_run()"]
  d392ee3c_2b59_0f60_2e4d_0c597bd9e905 -->|method| 4a92c221_786f_ad18_9a0e_ae66d8e29f5c
  5be39afa_04b0_73b2_495d_80294a76f0d1["on_chat_model_start()"]
  d392ee3c_2b59_0f60_2e4d_0c597bd9e905 -->|method| 5be39afa_04b0_73b2_495d_80294a76f0d1

Relationship Graph

Source Code

libs/partners/anthropic/tests/unit_tests/test_chat_models.py lines 1426–1438

class FakeTracer(BaseTracer):
    """Fake tracer to capture inputs to `chat_model_start`."""

    def __init__(self) -> None:
        super().__init__()
        self.chat_model_start_inputs: list = []

    def _persist_run(self, run: Run) -> None:
        """Persist a run."""

    def on_chat_model_start(self, *args: Any, **kwargs: Any) -> Run:
        self.chat_model_start_inputs.append({"args": args, "kwargs": kwargs})
        return super().on_chat_model_start(*args, **kwargs)