Add import check to cuda.init
Add import check to cuda.init

hvy/chainer,bayerj/chainer,AlpacaDB/chainer,sinhrks/chainer,woodshop/complex-chainer,laysakura/chainer,muupan/chainer,ttakamura/chainer,nushio3/chainer,cemoody/chainer,tigerneil/chainer,niboshi/chainer,kikusu/chainer,niboshi/chainer,muupan/chainer,t-abe/chainer,ttakamura/chainer,okuta/chainer,1986ks/chainer,ysekky/chainer,truongdq/chainer,benob/chainer,hidenori-t/chainer,kikusu/chainer,ikasumi/chainer,pfnet/chainer,wavelets/chainer,delta2323/chainer,okuta/chainer,cupy/cupy,yanweifu/chainer,jnishi/chainer,hvy/chainer,elviswf/chainer,wkentaro/chainer,woodshop/chainer,sou81821/chainer,kuwa32/chainer,benob/chainer,chainer/chainer,jnishi/chainer,chainer/chainer,masia02/chainer,jnishi/chainer,ronekko/chainer,aonotas/chainer,kiyukuta/chainer,wkentaro/chainer,rezoo/chainer,Kaisuke5/chainer,wkentaro/chainer,keisuke-umezawa/chainer,jnishi/chainer,ytoyama/yans_chainer_hackathon,tkerola/chainer,okuta/chainer,hvy/chainer,keisuke-umezawa/chainer,minhpqn/chainer,ktnyt/chainer,ktnyt/chainer,cupy/cupy,hvy/chainer,sinhrks/chainer,niboshi/chainer,okuta/chainer,truongdq/chainer,jfsantos/chainer,nushio3/chainer,keisuke-umezawa/chainer,AlpacaDB/chainer,tscohen/chainer,cupy/cupy,ktnyt/chainer,keisuke-umezawa/chainer,ktnyt/chainer,wkentaro/chainer,chainer/chainer,tereka114/chainer,t-abe/chainer,cupy/cupy,kashif/chainer,anaruse/chainer,chainer/chainer,niboshi/chainer,umitanuki/chainer