Avoid running certain hooks on uninitialized params
Avoid running certain hooks on uninitialized params

ronekko/chainer,chainer/chainer,wkentaro/chainer,niboshi/chainer,hvy/chainer,tkerola/chainer,keisuke-umezawa/chainer,okuta/chainer,keisuke-umezawa/chainer,jnishi/chainer,ktnyt/chainer,keisuke-umezawa/chainer,anaruse/chainer,rezoo/chainer,hvy/chainer,aonotas/chainer,ktnyt/chainer,hvy/chainer,hvy/chainer,chainer/chainer,okuta/chainer,okuta/chainer,chainer/chainer,pfnet/chainer,wkentaro/chainer,chainer/chainer,wkentaro/chainer,okuta/chainer,jnishi/chainer,niboshi/chainer,jnishi/chainer,jnishi/chainer,wkentaro/chainer,ktnyt/chainer,ktnyt/chainer,niboshi/chainer,niboshi/chainer,keisuke-umezawa/chainer