[mlpack-git] [mlpack] Added LeakyReLU (and hardtanh) activation layer and its test. (#544)

[Dhawal Arora]

Hi. Right now the implementation is under `/methods/ann/activation_functions`. Since i have included Backward and forwards passes, do you want me to move it to `/methods/ann/layer` before the separate pr? Thanks. 

---
Reply to this email directly or view it on GitHub:
https://github.com/mlpack/mlpack/pull/544#issuecomment-191910660
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.cc.gatech.edu/pipermail/mlpack-git/attachments/20160303/406199da/attachment-0001.html>