generate_from_stream() — langchain Function Reference

Source Code

libs/core/langchain_core/language_models/chat_models.py lines 182–208

def generate_from_stream(stream: Iterator[ChatGenerationChunk]) -> ChatResult:
    """Generate from a stream.

    Args:
        stream: Iterator of `ChatGenerationChunk`.

    Raises:
        ValueError: If no generations are found in the stream.

    Returns:
        Chat result.

    """
    generation = next(stream, None)
    if generation:
        generation += list(stream)
    if generation is None:
        msg = "No generations found in stream."
        raise ValueError(msg)
    return ChatResult(
        generations=[
            ChatGeneration(
                message=message_chunk_to_message(generation.message),
                generation_info=generation.generation_info,
            )
        ]
    )