Cosine Similarity
问题 I was reading and came across this formula: The formula is for cosine similarity. I thought this looked interesting and I created a numpy array that has user_id as row and item_id as column. For instance, let M be this matrix: M = [[2,3,4,1,0],[0,0,0,0,5],[5,4,3,0,0],[1,1,1,1,1]] Here the entries inside the matrix are ratings the people u has given to item i based on row u and column i . I want to calculate this cosine similarity for this matrix between items (rows). This should yield a 5 x 5