Improve get_handle
Improve get_handle

ronekko/chainer,kiyukuta/chainer,niboshi/chainer,wkentaro/chainer,ysekky/chainer,rezoo/chainer,ktnyt/chainer,pfnet/chainer,niboshi/chainer,hvy/chainer,cupy/cupy,okuta/chainer,jnishi/chainer,ktnyt/chainer,niboshi/chainer,keisuke-umezawa/chainer,jnishi/chainer,cupy/cupy,chainer/chainer,delta2323/chainer,okuta/chainer,jnishi/chainer,hvy/chainer,chainer/chainer,ktnyt/chainer,okuta/chainer,anaruse/chainer,okuta/chainer,ktnyt/chainer,wkentaro/chainer,wkentaro/chainer,hvy/chainer,tkerola/chainer,wkentaro/chainer,niboshi/chainer,keisuke-umezawa/chainer,kashif/chainer,jnishi/chainer,chainer/chainer,chainer/chainer,hvy/chainer,aonotas/chainer,cupy/cupy,keisuke-umezawa/chainer,keisuke-umezawa/chainer,cupy/cupy