The Classifier Is the Savior Again

blog@baifan.site (ByF (BaiFan)) — Sun, 20 Sep 2026 13:00:00 +0800

In any enterprise tech team that claims to be “fully AI-powered,” the bill nobody wants to look at closely is usually not production inference — it’s the evaluation pipelines we run to deceive ourselves.

Over the past three years, the biggest, most sacred, and least defensible totem in the enterprise stack has been the “private enterprise knowledge base” — first repackaged as RAG, then upgraded again as GraphRAG with a knowledge-graph label. Every architect, when drawing the final architecture diagram for the CTO, dutifully adds the last box: “Closed-loop evaluation and continuous alignment.”

RAG Complete Guide: Build a Local RAG System from Scratch

blog@baifan.site (ByF (BaiFan)) — Wed, 27 Aug 2025 14:00:00 +0800

Building a Local RAG with LangChain + Ollama + pgvector: A Complete Hands-On Walkthrough from 0 to 1 (with uv Dependency Management and an Interview Guide)
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This post is a directly actionable document. Follow it top to bottom and you will build a local RAG (retrieval-augmented generation) system from scratch and understand the key concepts and code. All core scripts come with comments to make learning and interview review easier.

LangChain on ByF (BaiFan) · Daily Deep Think

The Classifier Is the Savior Again

RAG Complete Guide: Build a Local RAG System from Scratch

Building a Local RAG with LangChain + Ollama + pgvector: A Complete Hands-On Walkthrough from 0 to 1 (with uv Dependency Management and an Interview Guide) #

Building a Local RAG with LangChain + Ollama + pgvector: A Complete Hands-On Walkthrough from 0 to 1 (with uv Dependency Management and an Interview Guide)
#