removed type annotation
removed type annotation

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