Python Dictionary

I am currently trying to speed up my large sparse (scipy) matrix multiplications. I have successful… Read more Is It Possible To Use Blas To Speed Up Sparse Matrix Multiplication?

I have rather simple question but still couldn´t make it work. I want a block diagonal n^2*n^2 mat… Read more How To Use Block_diag Repeatedly

I was calculating a Cosine Similarity Matrix for sparse vectors, and the elements expected to be fl… Read more Cosine Similarity Yields 'nan' Values

I'm trying to figure out how to iterate through a scipy sparse matrix by column. I'm tryin… Read more Iterating Over Scipy Sparse Matrix By Column

I getting unpleasant behavior when I set values in .data of csr_matrix to zero. Here is an example:… Read more Setting Elements In .data Attribute To Zero Unpleasant Behaivor In Scipy.sparse

I'm not sure what I am doing wrong but it seems that row indexing a scipy csr_matrix is approxi… Read more Why Is Row Indexing Of Scipy Csr Matrices Slower Compared To Numpy Arrays

I need to store word co-occurrence counts in several 14000x10000 matrices. Since I know the matrice… Read more Efficiently Populate Scipy Sparse Matrix From Subset Of Dictionary

I have a scipy.sparse.csc_matrix with dtype = np.int32. I want to efficiently divide each column (o… Read more Normalizing Sparse.csc_matrix By Its Diagonals