waifu2x-cpu-torch-vks

The original is here:
https://github.com/nagadomi/waifu2x

Differences:
- CPU only, no CUDA needed;
- double-precision version;
- GPU and CPU-trained models (on the fly conversion in memory);
- adapted for Lua v5.2 (works with Torch 7 on x32 Ubuntu).
31-12-2016:
- removed unneeded data copies, left from CUDA processing;
- removed large duplicate files (see "ReadMe" before use).