https://www.journaldev.com/32966/numpy-matrix-multiplication

University of Michigan - Ann Arbor

When multiplying n-dimensional arrays it's important to know what type of multiplication you want to do. 
- When you want to do element-wise multiplication np.multiply() works the same way as using the * operator
- However, sometimes you want to take the dot product of two arrays, in which case you should use np.dot()
- The final common way to multiply n-dimensional arrays is by using np.mmult() which will return the matrix product of the arrays

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