Fix doctest errors
Fix doctest errors

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