ABAditya Biranjeinadityabiranje210.hashnode.dev·Aug 15 · 8 min readI Trained a Digit Classifier Using Only NumPy. Here's Every Equation Behind the 82% Accuracymodel.fit(X, y) trains a neural network in one line. It also hides every equation that makes learning happen. I wanted to know what was actually running underneath that line, so I built a two-layer ne00
ABAditya Biranjeinadityabiranje210.hashnode.dev·Jul 23 · 27 min readDesigning the Ingestion Layer of a Production RAG SystemMost RAG postmortems point at retrieval. Wrong chunks come back, the reranker doesn't help, the LLM hallucinates around a gap in context. Almost none of it is a retrieval bug. By the time a query hits13A
