在python中找到单个精度epsilon值

Question

为单精度和双精度浮点运算找到机器的epsilon。

我已经使用以下代码完成了双精度，但是在python中找不到单个精度epsilon值虽然在c ++中它出来是5：960464 * 10 ** - 8

import sys
import numpy as np

epsilon=sys.float_info.epsilon/2.0

#Using the System Info, in python float is taken as double precision automatically    
print("Value of Machine epsilon double Precision  is:",epsilon)   


epsilon1 =1.0    #Using the while Loop, we see both values comes out to be same 
while(1+epsilon1!=1):
    epsilon1 = epsilon1*0.5 

print("Value of Machine epsilon double Precision  is:",epsilon1) 

Answer 1

您可以使用：

np.finfo(np.float32).eps