Satoshi Namai

better handling of GPU memory

3

If you want to free memory after inferencing with DNN, you should call `GC.start` so far. However I wouldn't like to call `GC.start` on ruby code.

Currently, `Dlib::Cuda.available?` return the static value which was decided on compile time.

* [ ] write test * [ ] setup travis-ci * [ ] add ci badge on README * [ ] write release scripts