The classic Information Retrieval, though out of date in many ways, does a great job covering the "old school" NLP approaches for IR and has an excellent sectio

The classic Information Retrieval, though out of date in many ways, does a great job covering the "old school" NLP approaches for IR and has an excellent section on Latent Semantic Indexing which you might find enjoyable: https://nlp.stanford.edu/IR-book/html/htmledition/latent-semantic-indexing-1.html https://nlp.stanford.edu/IR-book/html/htmledition/latent-sem...