gradient_check.cc: deep copy without connecting computational graph
gradient_check.cc: deep copy without connecting computational graph

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