A sleek Python code editor with a RAG pipeline diagram.

Build a Pure‑Python Hybrid RAG Engine with BM25, HNSW, and Cross‑Encoder Reranking

Learn to stitch together BM25, HNSW, and a miniature GPT‑2 model in pure Python for a standout RAG project.

September 18, 2026 · 8 min · 1568 words · martinuke0
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