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Building a Retrieval‑Augmented Generation (RAG) system from scratch without existing QA pairs requires a systematic cold‑start approach that creates synthetic QA data, establishes baseline metrics, iteratively improves via expert labeling and real user feedback, and ensures document quality for reliable evaluation.
This article walks through the practical differences between simple Retrieval‑Augmented Generation and a full Deep Research Agent, explains the four pillars that support such agents, demonstrates a minimal ReAct implementation with robust error handling, and shares interview tips for showcasing these systems.
This article dissects the shortcomings of pure vector retrieval, explains how BM25 complements it, compares weighted‑sum and Reciprocal Rank Fusion (RRF) strategies, shows experimental results that identify optimal weight and k values, and provides practical engineering tips for deploying hybrid search in RAG systems.
This article explains the limitations of Bi‑Encoder retrieval, introduces Cross‑Encoder rerankers, shows how a cascade of recall‑rerank‑generation improves answer quality, and provides concrete code, threshold‑filtering strategies, and domain‑specific fine‑tuning techniques for industrial RAG systems.
Enterprise RAG systems often mistakenly apply post‑filtering, retrieving unauthorized documents before permission checks, which violates audit compliance, wastes Top‑K slots, and risks data leakage in multi‑tenant environments; this article explains why pre‑filtering at the vector search layer, proper metadata design, token validation, and dynamic permission handling are essential.
This article examines the critical role of chunk splitting in Retrieval‑Augmented Generation systems, comparing three generations of methods—from fixed‑size token cuts to sentence‑aware and semantic‑aware strategies—showing how refined chunking, overlap tuning, and metadata design raise Recall@5 from 0.67 to 0.91 while addressing table, list, and long‑section challenges.
This article explains why AI agents need a structured memory module, outlines three memory types from cognitive science, details short‑term and long‑term storage architectures using vector databases, and provides concrete code and management strategies—including conflict resolution, TTL expiration, and privacy compliance—to build a robust Agent Memory system.
This article examines why RAG systems need a Code Interpreter, explains the dangers of executing LLM‑generated code with exec(), and presents three sandbox designs—restricted exec, Docker containers, and E2B cloud sandboxes—along with whitelist/blacklist rules, an eight‑step execution flow, and practical lessons learned from production deployment.
This article explains how to establish a six‑step closed‑loop workflow for operating RAG‑based question‑answer systems in insurance, covering badcase collection via three channels, four‑type classification, automated scripts, regression testing, gray‑scale rollout, and real‑world metrics that boosted answer accuracy from 76 % to 89 %.
This article dissects the unique challenges of RAG prompting, presents a systematic System/User Prompt design with strong constraints and citation requirements, compares constraint strengths with quantitative hallucination rates, and offers long‑context compression strategies and rigorous testing methods to ensure reliable LLM answers.
