move `initial_alpha` from `self.state` to `self`
move `initial_alpha` from `self.state` to `self`

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