myenv/Lib/site-packages/langchain/chat_models/base.py

from langchain_core.language_models.chat_models import (
    BaseChatModel,
    SimpleChatModel,
    agenerate_from_stream,
    generate_from_stream,
)

__all__ = [
    "BaseChatModel",
    "SimpleChatModel",
    "generate_from_stream",
    "agenerate_from_stream",
]