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it unlocks many cool features!
- from langchain_core.runnables.history import RunnableWithMessageHistory
- demo_ephemeral_chat_history_for_chain = ChatMessageHistory()
- chain_with_message_history = RunnableWithMessageHistory(
- chain,
- lambda session_id: demo_ephemeral_chat_history_for_chain,
- input_messages_key="input",
- history_messages_key="chat_history",
- )
- )
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