Improve initialize
Improve initialize

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