Add get_xpy function
Add get_xpy function

chainer/chainer,cupy/cupy,hvy/chainer,ktnyt/chainer,tigerneil/chainer,ikasumi/chainer,okuta/chainer,chainer/chainer,ysekky/chainer,hvy/chainer,niboshi/chainer,niboshi/chainer,wkentaro/chainer,jnishi/chainer,yanweifu/chainer,okuta/chainer,kikusu/chainer,okuta/chainer,hidenori-t/chainer,niboshi/chainer,jnishi/chainer,ktnyt/chainer,t-abe/chainer,kikusu/chainer,AlpacaDB/chainer,muupan/chainer,aonotas/chainer,truongdq/chainer,masia02/chainer,chainer/chainer,keisuke-umezawa/chainer,wkentaro/chainer,cupy/cupy,wkentaro/chainer,benob/chainer,sou81821/chainer,minhpqn/chainer,keisuke-umezawa/chainer,okuta/chainer,jnishi/chainer,1986ks/chainer,chainer/chainer,umitanuki/chainer,hvy/chainer,tscohen/chainer,sinhrks/chainer,cupy/cupy,keisuke-umezawa/chainer,wkentaro/chainer,ktnyt/chainer,sinhrks/chainer,anaruse/chainer,kashif/chainer,ronekko/chainer,ktnyt/chainer,jnishi/chainer,kiyukuta/chainer,Kaisuke5/chainer,ytoyama/yans_chainer_hackathon,benob/chainer,t-abe/chainer,cupy/cupy,niboshi/chainer,hvy/chainer,AlpacaDB/chainer,delta2323/chainer,cemoody/chainer,keisuke-umezawa/chainer,laysakura/chainer,muupan/chainer,rezoo/chainer,truongdq/chainer,tkerola/chainer,pfnet/chainer