test_func.py
import numpy as np
def func(x1, x2):
return 0.75 * np.exp(-(9 * x1-2) ** 2 / 4 - (9 * x2-2) ** 2 / 4) + 0.75 * np.exp(
-(9 * x1 + 1) ** 2 / 49 - (9 * x2 + 1) / 10) + \
0.5 * np.exp(-(9 * x1 - 7) ** 2 / 4 - (9 * x2 - 3) ** 2 / 4) - 0.2 * np.exp(
-(9 * x1 - 4) ** 2 - (9 * x2 - 7) ** 2)
