Question: numpy how to do matrix multiplication?
Answer: NumPy Multiplication Matrix If both a and b are 2-D (two dimensional) arrays -- Matrix multiplication. If either a or b is 0-D (also known as a scalar) -- Multiply by using numpy. multiply(a, b) or a * b. If a is an N-D array and b is a 1-D array -- Sum product over the last axis of a and b.