Tabla de Contenidos: “…-- Naïve, advanced, and modular RAG configurations -- RAG versus fine-tuning -- The RAG ecosystem -- The retriever (D) -- Collect (D1) -- Process (D2) -- Storage (D3) -- Retrieval query (D4) -- The generator (G) -- Input (G1) -- Augmented input with HF (G2) -- Prompt engineering (G3) -- Generation and output (G4) -- The evaluator (E) -- Metrics (E1) -- Human feedback (E2) -- The trainer (T) -- Naïve, advanced, and modular RAG in code -- Part 1: Foundations and basic implementation -- 1. …”