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

import numpy as np

def matrix_multiplication(a, b):
    """
        Multiply two matrices
    :param a:
    :param b:
    :return:
    """
    return np.dot(a, b)

# Enter the 2d array
a = np.array([[1,2,3],[4,5,6],[7,8,9]])
b = np.array([[1,2,3],[4,5,6],[7,8,9]])

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

#Example Output

# [[ 30  36  42]
#  [ 66  81  96]
#  [102 126 150]]

#Remember to inspect code for bugs.