How to clear state in langgraph?

[yhygta]

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How to clear state in langgraph?

Description

How to clear state in langgraph?

System Info

python 3.10

[dosubot[bot]]

Hey @yhygta, back for more LangChain adventures, I see! 🚀

Based on the context provided, it seems like you're looking to clear the state in LangGraph. However, the term "LangGraph" is not explicitly defined in the LangChain framework. It's inferred that you might be referring to the Graph class or the langgraph module.

If you're referring to the Graph class, it doesn't have a direct method to clear its state. The Graph class manages nodes and edges, where nodes can represent various entities and edges represent connections between these nodes. The class provides methods for adding and removing nodes and edges, but not for clearing the entire state.

If you're referring to the langgraph module, it's designed to facilitate the creation of graph indexes from text. It doesn't have a direct method to clear its state either.

However, if you're looking to clear the state of a conversation, you can do so by calling the clear() method on the chat_memory attribute of a ConversationBufferMemory instance. Here's how you can do it:

memory.chat_memory.clear()

This line of code effectively clears the state by removing all messages from the chat_memory.

If you're looking to clear the state of the SingleStoreDBChatMessageHistory class, you can do so by calling the clear() method on an instance of the class. Here's how you can do it:

message_history = SingleStoreDBChatMessageHistory(session_id="my-session", host="127.0.0.1", port=3306, user="user", password="password", database="db")
message_history.clear()

This will clear all messages associated with the session_id from the SingleStoreDB database.

Please note that clearing the state can have several potential side effects or consequences such as loss of cached data, performance impact, cost implications, concurrency considerations, and keyword arguments impact.

If none of these solutions apply to your situation, could you please provide more details about what you mean by "clearing the state in LangGraph"? This will help me provide a more accurate solution.

Sources

• libs/langchain/tests/integration_tests/memory/test_momento.py
• libs/core/langchain_core/runnables/graph.py
• libs/community/langchain_community/chat_message_histories/singlestoredb.py
• libs/core/langchain_core/caches.py
• libs/langchain/langchain/indexes/graph.py

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[yassineselmi]

Ideally, we should call a function in the checkpointer (ex: checkpointer.clear(config)).

In the meantime, I call the put function to update the DB entry with an empty checkpoint record (calling the utility function empty_checkpoint(). This is what I'm actually using and it works for my case:

def clear_memory(memory: BaseCheckpointSaver, thread_id: str) -> None:
    checkpoint = empty_checkpoint()
    memory.put(config={"configurable": {"thread_id": thread_id}}, checkpoint=checkpoint, metadata={})

# Calling the function

memory = SqliteSaver.from_conn_string("checkpoints.sqlite")
app = graph.compile(checkpointer=memory)

clear_memory(memory=memory, thread_id="123456")

[jaymangukiya0001]

Hi @yassineselmi

do you have idea that how do i clear the memory when flow reaches to the END node. I am creating the thread id using user's email as I am having multiple user's conversations going on. How do I clear the memory when flow reaches to the end.

[shubhankar1477]

Hi @yassineselmi

So i am serving langgprah as fastapi and clearing memory after each request , but i am getting error pasted below.
And using MemorySaver() not Sqllite saver

ERROR : self.step = self.checkpoint_metadata["step"] + 1
KeyError: 'step'

[vigneshmj1997]

It there a way to clear one variable of the state ..? Rather reset the whole state

[daher928]

Hello, any updates on this matter?