tensor processing units
https://www.intelnervana.com/intel-nervana-neural-network-processor-architecture-update/
http://timdettmers.com/2017/03/19/which-gpu-for-deep-learning/
http://deeplearningathome.com/2016/09/Building-PC-For-Deep-Learning-Hardware.html
CUDA optimization: https://github.com/akrizhevsky/cuda-convnet2
Nice Nvidia hardware for deep learning: https://developer.nvidia.com/devbox
NVIDIA GPUs - The Engine of Deep Learning
https://www.reddit.com/r/buildapcforme/comments/3vrokm/high_end_pc_for_deep_learning_up_to_3500/