Support only 4, 5 dimensional arrays for a while.
Support only 4, 5 dimensional arrays for a while.

okuta/chainer,keisuke-umezawa/chainer,hvy/chainer,keisuke-umezawa/chainer,wkentaro/chainer,chainer/chainer,hvy/chainer,ktnyt/chainer,wkentaro/chainer,okuta/chainer,chainer/chainer,ktnyt/chainer,jnishi/chainer,chainer/chainer,jnishi/chainer,tkerola/chainer,keisuke-umezawa/chainer,okuta/chainer,niboshi/chainer,ktnyt/chainer,hvy/chainer,niboshi/chainer,wkentaro/chainer,jnishi/chainer,jnishi/chainer,niboshi/chainer,wkentaro/chainer,niboshi/chainer,keisuke-umezawa/chainer,okuta/chainer,ktnyt/chainer,hvy/chainer,pfnet/chainer,chainer/chainer