RAG
May 6, 2026
Alibaba Cloud Full Stack
66 min readAlibaba Cloud Full Stack (9): OpenSearch and AI Search
From keyword search to AI-powered retrieval: OpenSearch service, vector search for RAG, LLM-powered query rewriting, and hybrid search. Build a product search engine combining vectors and keywords.
Apr 3, 2026
LLM Engineering
30 min readLLM Engineering (8): Retrieval-Augmented Generation
Chunking strategies, dense vs sparse vs hybrid retrieval, reranker selection, the long-context-vs-RAG tradeoff in 2026, and the failure modes that show up at 100K+ documents.
Nov 15, 2025
NLP
34 min readNLP (10): RAG and Knowledge Enhancement Systems
Build production-grade RAG systems from first principles: the retrieve-then-generate decomposition, vector indexes (FAISS / Milvus / Chroma / Weaviate / Pinecone), dense+sparse hybrid retrieval with RRF, cross-encoder …
LLM Workflows and Application Architecture: Enterprise Implementation Guide
From a single API call to a production LLM platform — workflow patterns, RAG, model routing, deployment, cost levers, observability, and enterprise integration, with the trade-offs that actually matter.