FAISS Vector Library with LangChain and OpenAI (Semantic Search)
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In this video, we take a look at the Facebook AI Similarity Search (FAISS) vector library. Through a few examples, we will grab a document, chunk it, set up embeddings, and search through it.
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In this video, I walk you through using FAISS (Facebook AI Similarity Search) to build a vector database for document search and retrieval. We start by breaking down what FAISS is and how it stores vector embeddings, then move into practical Python implementation using LangChain and OpenAI embeddings.
I demonstrate the complete workflow: loading a Metallica Wikipedia article, chunking it with a recursive text splitter, converting chunks into embeddings, and storing them in a FAISS vector library. You'll see three key use cases in action—similarity search queries, retrievers with QA chains, and saving/loading FAISS indexes for reuse. We test the system with real queries like "Who replaced Cliff Burton?" and "What Metallica album do fans hate the most?" to show how semantic search works in practice.
By the end of this tutorial, you'll understand how to implement vector databases for document search, perform similarity searches with scoring, use retrievers for question-answering systems, and persist your FAISS indexes to avoid rebuilding them. Whether you're building a chatbot, search engine, or RAG application, this foundational knowledge will help you leverage vector databases effectively. All code is demonstrated in Google Colab with step-by-step explanations.
TIMESTAMPS
00:00 Introduction to FAISS
01:00 Setting Up Google Colab & Imports
03:02 Loading Documents & Text Splitting
05:17 Creating Embeddings & Vector Library
08:48 Similarity Search Query Example
12:22 Understanding Similarity Scores
14:40 Using FAISS as a Retriever
17:32 Testing Query Results
18:17 Saving & Loading FAISS Index
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Who is Ryan
Ryan is a Data Scientist at a fintech company, where he focuses on fraud prevention in underwriting and risk. Before that, he worked as a Data Analyst at a tax software company. He holds a degree in Electrical Engineering from UCF.
Who is Matt
Matt is the founder of Width.ai, an AI and Machine Learning agency. Before starting his own company, he was a Machine Learning Engineer at Capital One.
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