#VLAD layer in Theano
The idea of VLAD layer is proposed in this paper: http://arxiv.org/abs/1511.07247
And their presentation: http://www.di.ens.fr/willow/research/netvlad/NetVLAD.pdf
Original MATLAB implementation: https://github.com/Relja/netvlad
TODO.
- test VLAD Layer on bigger datasets