Human: matrix multiplication *. Assistant: 
Here is a Python code to matrix multiplication

import numpy as np

def mat_mult(a, b):
    """Matrix multiplication
    """
    return np.matmul(a, b)

# Enter the matrix
a = np.array([[1, 2], [3, 4]])
b = np.array([[5, 6], [7, 8]])

# Calling the function
print((mat_mult(a, b)))

#Example Output
# [[19 22]
#  [43 50]]

#Remember to inspect code for bugs.