Add function alias to check if cuDNN acceptable type.
Add function alias to check if cuDNN acceptable type.

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