Fixed a flake8 error.
Fixed a flake8 error.

Fixed a line length limitation error.

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