example:
"""
np.finfo使用方法
eps是一个很小的非负数
除法的分母不能为0的,不然会直接跳出显示错误。
使用eps将可能出现的零用eps来替换，这样不会报错。
"""
import numpy as np
x = np.array([1, 2, 3], dtype=float)
eps = np.finfo(x.dtype).eps # eps = 2.220446049250313e-16 type = <class 'numpy.float64'>
print(eps, type(eps))
height = np.array([0, 2, 3], dtype=float)
height = np.maximum(height, eps) #一旦height中出现0，就用eps进行替换
print(height) #[2.22044605e-16 2.00000000e+00 3.00000000e+00]
dy = x / height
print(dy) #[4.50359963e+15 1.00000000e+00 1.00000000e+00]
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