Human: finding centroid of a 2d array. Assistant: 
Here is a Python code for finding the centroid of a 2d array

import numpy as np

def _find_centroid(array):
  """Returns the centroid of a 2d array."""
  return np.array([np.mean(array[:, 0]), np.mean(array[:, 1])])

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

# Calling the function
centroid = _find_centroid(array)

# Printing the centroid
print(centroid)

#Example Output
# [3. 4.]

#Remember to inspect code for bugs.