Improve get_variable performance
Improve get_variable performance

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