Enhancing RAG-Based Generative AI Applications with HNSW Indexes in PostgreSQL

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  In the rapidly evolving landscape of Generative AI, Retrieval-Augmented Generation (RAG) models have emerged as powerful tools, combining the strengths of large language models with external knowledge bases. However, as the size of these knowledge bases grows, ensuring efficient and rapid retrieval becomes paramount. This is where Hierarchical Navigable Small World (HNSW) indexes come into play. In this blog post, we’ll explore how HNSW indexes can significantly improve the performance of RAG-based applications using PostgreSQL and PgVector, backed by a practical experiment involving a dataset with one million rows. Understanding RAG and Its Performance Challenges Retrieval-Augmented Generation applications integrate large language models with external databases or knowledge bases. Instead of relying solely on the pre-trained knowledge embedded within the model, RAG models fetch relevant information from external sources in real time, enhancing the accuracy and relevance of gener...