human
get number of nonzero values in array.
assistant
Here is a Python function to get number of nonzero values in array

import numpy as np

def count_nonzero(array):
    """
    Counts the number of non-zero values in the array.
    """
    return np.count_nonzero(array)

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

# Calling the function
print((count_nonzero(array)))

#Example Output
# 9

#Remember to inspect code for bugs.