Learn how to implement SVD and NMF methods to decompose user-item rating matrices and improve recommendations using Python or R. Skip to main content LinkedIn Articles ...

Matrix addition is done by adding up each element, using the plus sign (+). The result of the sum will be a new element. Each matrix is accessed by each element at the same coordinates and then added ...

This is not correct. The correct behavior would be for Python to throw a ValueError, specifying the mismatch in array shapes. Indeed, this is the behavior if B is anything but a column or row matrix.