Refactor FunctionNode.apply preparation
Refactor FunctionNode.apply preparation

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