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MissingTokensModel Class — langchain Architecture

Architecture documentation for the MissingTokensModel class in test_summarization.py from the langchain codebase.

Class python

Entity Profile

Dependency Diagram

graph TD
  05ab2f52_f888_2e4b_6f98_da4c4f7c8742["MissingTokensModel"]
  48aa29b8_65e7_522f_a445_a441eeb6baff["BaseChatModel"]
  05ab2f52_f888_2e4b_6f98_da4c4f7c8742 -->|extends| 48aa29b8_65e7_522f_a445_a441eeb6baff
  1911a463_b67d_0301_5ef1_5c535dafc14a["test_summarization.py"]
  05ab2f52_f888_2e4b_6f98_da4c4f7c8742 -->|defined in| 1911a463_b67d_0301_5ef1_5c535dafc14a
  81286ab9_f502_8383_2247_58f0060802c5["_generate()"]
  05ab2f52_f888_2e4b_6f98_da4c4f7c8742 -->|method| 81286ab9_f502_8383_2247_58f0060802c5
  7c78bf7a_e70e_3754_ce37_e09d3332fb66["_llm_type()"]
  05ab2f52_f888_2e4b_6f98_da4c4f7c8742 -->|method| 7c78bf7a_e70e_3754_ce37_e09d3332fb66

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_summarization.py lines 689–704

    class MissingTokensModel(BaseChatModel):
        profile: ModelProfile | None = Field(default=ModelProfile(other_field=100), exclude=True)  # type: ignore[typeddict-unknown-key]

        @override
        def _generate(
            self,
            messages: list[BaseMessage],
            stop: list[str] | None = None,
            run_manager: CallbackManagerForLLMRun | None = None,
            **kwargs: Any,
        ) -> ChatResult:
            return ChatResult(generations=[ChatGeneration(message=AIMessage(content="Summary"))])

        @property
        def _llm_type(self) -> str:
            return "mock"

Defined In

Extends

Source

Frequently Asked Questions

What is the MissingTokensModel class?
MissingTokensModel is a class in the langchain codebase, defined in libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_summarization.py.
Where is MissingTokensModel defined?
MissingTokensModel is defined in libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_summarization.py at line 689.
What does MissingTokensModel extend?
MissingTokensModel extends BaseChatModel.

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