Matrix Factorization and Latent Semantic Indexing Polysemy and context Document similarity on single word level: polysemy and context rIng Jupiter Space meaning 1 voyager planet saturn ●● meaning 2 car Company contribution to similarity, if dodge used in 1st meaning, but not ford if in 2ndMatrix Factorization and Latent Semantic Indexing 29 Polysemy and Context ▪ Document similarity on single word level: polysemy and context car company ••• dodge ford meaning 2 ring jupiter ••• space meaning 1 voyager … saturn ... … planet ... contribution to similarity, if used in 1st meaning, but not if in 2nd LSI