I really do not understand what does this code do
M = sparse.coo_matrix((*n, (Y, range(n))), shape=(k,n)).toarray()
The code is related to calculating the sparse function in this equation, but I am really confused and I do not know how it iterates through it and what is: 1- sparse.coo_matrix 2- (Y, range(n))) 3-shape=(k,n)).toarray() ??
Thank you , and please forgive my poor English.