The Missing Clause: Search Engines and Information Retrieval

Deep End Era. Engineering with Sankalp · Oct 28, 2026 · 1h 4m

From Callimachus, concordances and Vannevar Bush to Luhn, Cleverdon's Cranfield experiments, Salton's vector space model, Spärck Jones's IDF and TREC; postings, Porter stemming, compression, WAND, Lucene and Elasticsearch; the probability ranking principle and BM25 from Okapi at TREC-3; pooling, precision, recall, MRR, MAP, nDCG, interleaving; PageRank, HITS and spam; query understanding and Rocchio; RankNet, LambdaMART; word2vec, BERT, cross-encoders, DPR, ColBERT, SPLADE, MTEB; LSH, product quantisation, FAISS, HNSW, DiskANN; reciprocal rank fusion; structure-aware chunking and version…