human
how to determine depth nested list.
assistant
Here is a Python function to determine depth nested lists

import numpy as np

def _depth_nested_list(list_of_list):
        """Determine depth nested list.
        """
        if isinstance(list_of_list, list):
            return 1 + _depth_nested_list(list_of_list)
        else:
            return 0

# Enter the array
a = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]])

# Calling the function
print((_depth_nested_list(a)))

#Example Output
# 0

#Remember to inspect code for bugs.