Fix doctest
Fix doctest

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