fix docstring: eps (int) -> (float)
fix docstring: eps (int) -> (float)

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