本文介绍了python中的条件计算的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试从此处使用我自己的logsumexp()修改版本: https://github.com/scipy/scipy /blob/v0.14.0/scipy/misc/common.py#L18
I'm attempting to use my own modified version of the logsumexp() from here: https://github.com/scipy/scipy/blob/v0.14.0/scipy/misc/common.py#L18
第85行上的计算如下:
On line 85, is this calculation:
out = log(sum(exp(a - a_max), axis=0))
但是我有一个阈值，我不希望a - a_max超过该阈值.有没有一种方法可以进行条件计算，只有当差异不小于阈值时，才允许进行减法运算.像这样:
But I have a threshold and I don't want a - a_max to exceed that threshold.Is there a way to do a conditional calculation, which would allow the subtraction to take place only if the difference isn't less than the threshold.So something like:
out = log(sum(exp( (a - a_max < threshold) ? threshold : a - a_max), axis = 0))
推荐答案
Python中有一个条件内联语句:
There is a conditional inline statement in Python:
Value1 if Condition else Value2
您的公式将转换为:
out = log(sum(exp(threshold if a - a_max < threshold else a - a_max), axis = 0))
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