Feat: fix deleted by doc id

[FeHuynhVI]

Description
Fix issue related to document deletion logic. The bug previously prevented proper removal of items from the FAISS vector store.

Related Issues
N/A

Changes Made
Fixed the delete function to ensure correct removal from FAISS.

Verified that deletion works as expected locally.

Checklist
Changes tested locally

Code reviewed

Documentation updated (if necessary)

Unit tests added (if applicable)

Additional Notes
The issue was isolated to FAISS indexing during document deletion. After applying the fix, local tests confirmed the functionality works correctly.

[FeHuynhVI]

It seems that a hallucination occurred after the delete operation. If anyone has any ideas, please feel free to comment and help

"I'm using FAISS as the vector database, with all data stored locally."

[danielaskdd]

LightRAG relies significantly on entity and relation summaries to generate accurate responses to queries; therefore, removing vector chunks can lead to hallucinations.

[FeHuynhVI]

LightRAG relies significantly on entity and relation summaries to generate accurate responses to queries; therefore, removing vector chunks can lead to hallucinations.

"In a real-world project, not being able to delete or update documents makes things extremely difficult. I might need to consider replacing the current solution.

[danielaskdd]

If we retain all original entity and relation descriptions along with the corresponding document IDs from which these descriptions originate, we will be able to re-aggregate the descriptions after a specific document ID has been deleted.

This feature is currently on the LightRAG roadmap. Any discussion or contributions regarding this feature are welcome.

[zcfrank1st]

any update?

[FeHuynhVI]

any update?

I’ve switched to RAGFlow, but I don’t have enough experience to handle this issue.