added suggested changes
added suggested changes

Co-Authored-By: Toshiki Kataoka <cce28e5ee3225a1f98f0cd672583c58a44382fef@gmail.com>
hvy/chainer,chainer/chainer,hvy/chainer,chainer/chainer,chainer/chainer,hvy/chainer,hvy/chainer,pfnet/chainer,chainer/chainer