Fix doctest
Fix doctest

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