How to implement adaptive step decay learning rate policy?

In VGG and ResNet, they all decay the learning rate when the validation accuracy stops improving or at the error plateau.
I want to implement this policy.
However, I don’t know how to evaluate the error plateau.
Could anyone give me some advice?

See this:

It’s not part of release yet.

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Thank you very much!
I am also looking forward to the early stopping function.