feat: Add LEANN vector index target for RAG support in CocoIndex #1388

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Ash-Blanc wants to merge 2 commits into cocoindex-io:main from Ash-Blanc:main

Ash-Blanc commented Dec 17, 2025

Summary

This PR adds LEANN vector index target support to CocoIndex, enabling efficient RAG capabilities with 97% storage savings.

Features

Efficient Vector Indexing: 97% storage savings via graph-based recomputation
Multiple Backends: HNSW (default) and DiskANN
Flexible Embedding Models: facebook/contriever, Ollama, OpenAI, etc.
Metadata Preservation: Automatic field preservation in search results
Privacy-First: All processing is local
Incremental Updates: Full support for building incrementally

Implementation

File: python/cocoindex/targets/leann.py
Size: 165 lines of code
Pattern: Follows CocoIndex target connector design
Configuration: Fully customizable via LEANN spec

Related Projects

Integrates LEANN (https://github.com/yichuan-w/LEANN)
Graph-based selective recomputation vector database

Ash-Blanc added 2 commits

December 17, 2025 17:30


          feat: Add LEANN vector index target for RAG support in CocoIndex

bbf6d03


          feat: Add LEANN optional dependency

b71485d

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