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Chang-Woo Rhee · Oct 20, 2026

This is a practical build guide for a RAG (Retrieval-Augmented Generation) chatbot. The core idea: use a small encode...

#llm #rag #chatbot #embeddings #retrieval

Chang-Woo Rhee · Oct 09, 2026

Three nested ideas: NLP is the field, the Transformer is the architecture that revolutionized it, and BERT i...

#nlp #transformers #bert #machine-learning #deep-learning

Chang-Woo Rhee · Aug 02, 2026

Real-World Uses of Differentiation and IntegrationWhere calculus actually appears in daily life, engineering, and AI....

#ai #math #differentiation #integration #calculus #real-world #engineering

Chang-Woo Rhee · Aug 02, 2026

Natural Logarithm: ln(x)What ln means, its derivative, and why it's used in AI loss functions. What is ln?ln(x) = na...

#ln #logarithm #limits #ai #cross-entropy #math #calculus

Chang-Woo Rhee · Aug 02, 2026

Euler's Number: e ≈ 2.71828What it is, where it comes from, and why it appears everywhere in AI. What is e?A mathema...

#euler #e #softmax #sigmoid #ai #math #calculus #compound-interest #hwang-law #ai-scaling

Chang-Woo Rhee · Aug 02, 2026

Neural Network Backpropagation — Worked ExamplePart 2: Complete forward pass and backward pass with actual numbers, A...

#python #sigmoid #ai #math #integration #backpropagation #neural network #chain rule #relu

Chang-Woo Rhee

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