related words which should be not necessarily co-occur with each other because you just not have that possible sentence so sparsity is a big issue the resulting matrix you construct is very likely to be sparse and the computation cost right so SVD is a third order to compute so it's not going to be easy to optimize and there's also this problem of infrequent words which is when you have any dope when certain words are not particularly frequently present they're going to be hard to optimize because the word embeddings for them