keras极限输出最小值最大值 [英] keras limiting output min max value

问题描述

我的问题很简单.

如何使keras输出受到边界(最小和最大)的限制?

How do I make keras output to be limited with boundaries - min and max?

有人建议我制作一个自定义激活函数，以将输出转换为最小值和最大值.我希望它是我的最后选择.

Some people suggest me to make a custom activation function to converts the output to transform in min and max values. I want it to be my last option.

我认为带有min_max_norm的Dense层上的kernel_constraint和bias_constraint可以工作，但事实证明这是行不通的.

I thought kernel_constraint and bias_constraint on Dense layer with min_max_norm will work but it turns out to be not working.

推荐答案

如果您可以牺牲激活函数的线性，那么这很容易，您可以使用Sigmoid来获得0到1之间的值，然后简单地重新缩放输出，您将需要解决一些方程式，以找到重新缩放的参数，形式为

If you can sacrifice the linearity of the activation function, then this is easy, you can use Sigmoid to get between 0 and 1 and then simply rescale your output, you will need to solve some equations to find the rescaling parameter which will be in the form

y_in_range = (y_pred + addConst)*multConst

经过一点数学运算后，您会发现addConst = min/(max-min)和multConst = (max-min)

And after a little bit of maths you will find that addConst = min/(max-min) and multConst = (max-min)

但是请记住，您要放松最终激活层的线性度，如果要使其线性化，则必须完成整个功能，我知道这也是一种自定义激活，但是我相信这是最接近的开始使用内置的keras函数.

But remember you loose the linearity of your final activation layer, if you want it to be linear you have to make the entire function, I know this is also a sort of custom activation, but I believe this is the closest you will get to using an inbuilt keras function.

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