Matrix Factorization and Latent Semantic Indexing Time out came to this class to learn about web search and mining, not have my linear algebra past dredged up agaIn But if you want to dredge, Strangs Applied Mathematics is a good place to start What do these matrices have to do with text? Recall M XN term-document matrices But everything so far needs square matrices-soMatrix Factorization and Latent Semantic Indexing 15 Time out! ▪ I came to this class to learn about web search and mining, not have my linear algebra past dredged up again … ▪ But if you want to dredge, Strang’s Applied Mathematics is a good place to start. ▪ What do these matrices have to do with text? ▪ Recall M  N term-document matrices … ▪ But everything so far needs square matrices – so …