init() — langchain Function Reference

Architecture documentation for the __init__() function in usage.py from the langchain codebase.

Function python Observability CallbackManager

Entity Profile

Observability→ CallbackManager→ __init__() — langchain Function Reference

Dependency Diagram

graph TD
  8294adc5_08d9_f177_632a_6108fb78b326["__init__()"]
  b3bf0e8c_5ef8_a03f_bf9e_d1c27e7284b2["UsageMetadataCallbackHandler"]
  8294adc5_08d9_f177_632a_6108fb78b326 -->|defined in| b3bf0e8c_5ef8_a03f_bf9e_d1c27e7284b2
  style 8294adc5_08d9_f177_632a_6108fb78b326 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/langchain_core/callbacks/usage.py lines 51–55

    def __init__(self) -> None:
        """Initialize the `UsageMetadataCallbackHandler`."""
        super().__init__()
        self._lock = threading.Lock()
        self.usage_metadata: dict[str, UsageMetadata] = {}