Hybrid Search Finds What Vectors Miss (RAG)

Shane | LLM Implementation · Intermediate ·🔍 RAG & Vector Search ·2w ago

Skills: Advanced RAG90%

Vector search encodes meaning but misses exact keywords. BM25 matches exact terms but misses semantics. This video combines both with Reciprocal Rank Fusion — and shows the answer quality difference on real queries against technical documentation. 📚 This is Module 5 of a 10-part RAG course. New modules dropping regularly. ⏳ Chapters: 00:00 The Keyword Blind Spot 00:46 The Vector Search Blind Spot 01:15 BM25 and Hybrid Search 01:54 Code Setup 02:19 Vector Search Fails on Exact Matches 03:07 BM25 Finds the Exact Row 03:28 Reciprocal Rank Fusion (RRF) 03:56 Hybrid Retrieval Demo 04:31 Answer Quality: Vector vs Hybrid 05:24 Wrap Up & Module 6 Teaser 🔗 Links: Full RAG Course Playlist: https://www.youtube.com/playlist?list=PL0G6--HT7Yq_sxLFyWFWL6KHYWlosspj_ Grab the Notebook in Discord: https://discord.gg/KpnJQbgpjt 📱 Follow: Twitter/X: @LLM_Implement Discord: discord.gg/KpnJQbgpjt ▶️ Previous — Module 4 (Reranking): https://www.youtube.com/watch?v=qoHjx1vizak

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Chapters (10)

The Keyword Blind Spot

0:46 The Vector Search Blind Spot

1:15 BM25 and Hybrid Search

1:54 Code Setup

2:19 Vector Search Fails on Exact Matches

3:07 BM25 Finds the Exact Row

3:28 Reciprocal Rank Fusion (RRF)

3:56 Hybrid Retrieval Demo

4:31 Answer Quality: Vector vs Hybrid

5:24 Wrap Up & Module 6 Teaser

Watch this before applying for jobs as a developer.