Fix PEP8-conformant
Fix PEP8-conformant

hvy/chainer,niboshi/chainer,okuta/chainer,wkentaro/chainer,chainer/chainer,wkentaro/chainer,okuta/chainer,okuta/chainer,chainer/chainer,niboshi/chainer,hvy/chainer,wkentaro/chainer,chainer/chainer,keisuke-umezawa/chainer,wkentaro/chainer,okuta/chainer,keisuke-umezawa/chainer,chainer/chainer,keisuke-umezawa/chainer,keisuke-umezawa/chainer,niboshi/chainer,pfnet/chainer,hvy/chainer,hvy/chainer,niboshi/chainer