Compute the sum of two matrices in Python.
matrix_1 = [[1, 2, 3], [4, 5, 6]]
matrix_2 = [[7, 8, 9], [10, 11, 12]]
import numpy as np

matrix_1 = np.array(matrix_1)
matrix_2 = np.array(matrix_2)

result = np.add(matrix_1, matrix_2)

## Output: [[ 8 10 12], [14 16 18]]