Add MC Dropout to obtain confidence estimate

[zer0n]

Original Paper

Follow-up paper for RNN

[bischtob]

Here is also the GitHub of the paper author: https://github.com/yaringal

[bischtob]

I think this code relevant for implementing MC dropout. It builds a keras layer to handle the issue:
https://github.com/yaringal/ConcreteDropout
The corresponding paper is:
https://arxiv.org/abs/1705.07832

[shirleyuw]

#25 I submitted a pull request for the MC dropout.