deleted unnecessary func and omitted some codes and more.
deleted unnecessary func and omitted some codes and more.

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