向下取整：np.floor()，向上取整：np.ceil()

import numpy as np
a = np.floor(2.3)  # 向下取整
b = np.floor([1.6, -2.5])
print('a:', a)
print('b:', b)

a: 2.0
b: [ 1. -3.]

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import numpy as np
c = np.ceil(0.2)  # 向上取整
d = np.ceil([1.6, 0.3, -0.2, -3.5])
print('c:', c)
print('d:', d)

c: 1.0
d: [ 2. 1. -0. -3.]