Min Max

import numpy as np
a = np.array([
    [1, 2],
    [3, 4]
])
a.min()
1

a.min(axis=0)
array([1, 2])

a.min(axis=1)
array([1, 3])

np.min(a)
1

np.min(a, axis=0)
array([1, 2])

a.max()
4

a.max(axis=0)
array([3, 4])

a.max(axis=1)
array([2, 4])