Check existence of cython
Check existence of cython

aonotas/chainer,hvy/chainer,kiyukuta/chainer,chainer/chainer,kikusu/chainer,hvy/chainer,jnishi/chainer,pfnet/chainer,kikusu/chainer,niboshi/chainer,hvy/chainer,wkentaro/chainer,keisuke-umezawa/chainer,benob/chainer,cupy/cupy,ktnyt/chainer,delta2323/chainer,ktnyt/chainer,keisuke-umezawa/chainer,cupy/cupy,hvy/chainer,cemoody/chainer,chainer/chainer,wkentaro/chainer,jnishi/chainer,rezoo/chainer,chainer/chainer,wkentaro/chainer,okuta/chainer,ktnyt/chainer,tkerola/chainer,jnishi/chainer,chainer/chainer,ktnyt/chainer,cupy/cupy,keisuke-umezawa/chainer,ysekky/chainer,niboshi/chainer,okuta/chainer,benob/chainer,keisuke-umezawa/chainer,kashif/chainer,sinhrks/chainer,okuta/chainer,niboshi/chainer,anaruse/chainer,okuta/chainer,niboshi/chainer,sinhrks/chainer,cupy/cupy,jnishi/chainer,wkentaro/chainer,AlpacaDB/chainer,AlpacaDB/chainer,ronekko/chainer