Add a clear() method to VectorStoreRetrieverMemory with FAISS vector store

[uray-lu]

- Description: In constructing the VectorStoreRetrieverMemory with InMemoryDocstore() like faiss vectorstore, it may also need to clear the chat_history memory like ConversationBufferMemory. To clear the memory without reconstruct a new memory, I add a clear() method to VectorStoreRetrieverMemory make it reusable in the same session, and can use memory.clear() to empty the memory vectorstore. < Only fot the FAISS vectorstore>

- Issue: the issue #5817 how to clear VectorStoreRetrieverMemory?

- Dependencies: None
- Tag maintainer:
- Twitter handle: @932196e6a7d042d

**- Usecase: **

from langchain.memory import VectorStoreRetrieverMemory
from langchain.prompts import PromptTemplate
from langchain.docstore import InMemoryDocstore
from langchain.vectorstores import FAISS
import faiss
embedding_size = 1536 # Dimensions of the OpenAIEmbeddings
index = faiss.IndexFlatL2(embedding_size)
embedding_fn = OpenAIEmbeddings().embed_query
vectorstore = FAISS(embedding_fn, index, InMemoryDocstore({}), {})
retriever = vectorstore.as_retriever(search_kwargs=dict(k= 3)) #set the vector store args
memory = VectorStoreRetrieverMemory(retriever=retriever)

# When added to an agent, the memory object can save pertinent information from conversations or used tools
memory.save_context({"input": "My favorite food is pizza"}, {"output": "that's good to know"})
memory.save_context({"input": "My favorite sport is soccer"}, {"output": "..."})
memory.save_context({"input": "I don't the Celtics"}, {"output": "ok"}) 

# Query the relevance history
memory.load_memory_variables({"prompt": "How's the weather "})
## return {'history': "input: My favorite food is pizza\noutput: that's good to know"}


#Clear 
memory.clear()
memory.load_memory_variables({"prompt": "How's the weather "})
## return {"history":}

@baskaryan

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Name	Status	Preview	Comments	Updated (UTC)
langchain	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 6, 2023 2:27am

[levscaut]

Hi, I was also running to this issue. What happened to this PR next? Why was it closed? Thanks for your help.

[uray-lu]

Hi,I remember after read the source code, it was already a method exist in the base class or in the abstract method, you can just inherit and write your own clear logic with the FAISS package.Feel free to reach me if this doesn’t work.On Nov 24, 2024, at 05:33, Wendong Li ***@***.***> wrote: Hi, I was also running to this issue. What happened to this PR next? Why was it closed? Thanks for your help. —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you modified the open/close state.Message ID: ***@***.***>