Follow pep8 and flake8
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hvy/chainer,pfnet/chainer,niboshi/chainer,tkerola/chainer,okuta/chainer,okuta/chainer,ktnyt/chainer,okuta/chainer,jnishi/chainer,niboshi/chainer,wkentaro/chainer,jnishi/chainer,keisuke-umezawa/chainer,hvy/chainer,wkentaro/chainer,wkentaro/chainer,ronekko/chainer,hvy/chainer,okuta/chainer,jnishi/chainer,ktnyt/chainer,wkentaro/chainer,chainer/chainer,keisuke-umezawa/chainer,keisuke-umezawa/chainer,chainer/chainer,niboshi/chainer,anaruse/chainer,jnishi/chainer,niboshi/chainer,ktnyt/chainer,hvy/chainer,rezoo/chainer,ktnyt/chainer,chainer/chainer,chainer/chainer,keisuke-umezawa/chainer