Add cuda.init mehthod to show warning
Add cuda.init mehthod to show warning

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