remove unused
remove unused

hvy/chainer,pfnet/chainer,niboshi/chainer,chainer/chainer,hvy/chainer,wkentaro/chainer,wkentaro/chainer,chainer/chainer,chainer/chainer,chainer/chainer,wkentaro/chainer,hvy/chainer,wkentaro/chainer,niboshi/chainer,niboshi/chainer,hvy/chainer,niboshi/chainer