Keras competability

[ParthaEth]

Hi,

Congratulations for the awesome piece of code. It works out of the box with Keras! With only one glitch that when a default 'ReduceOnPlateau' learning rate scheduler is used the following error is thrown

"AttributeError: 'TFOptimizer' object has no attribute 'lr'"

I know that the learning rate schedule is internal in your method and should not be scheduled from outside however to keep compatibility a proper error might be thrown I suppose.

Thanks.