Further work on QR
Further work on QR

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