Fix doctest
Fix doctest

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