def propdown(self, hid):
        pre_sigmoid_activation = T.dot(hid, self.W.T) + self.vbias
        return [pre_sigmoid_activation, T.nnet.sigmoid(pre_sigmoid_activation)]
This function propagates the hidden units activation downwards to
dataset/ETHPy150Open lisa-lab/DeepLearningTutorials/code/rbm.py/RBM.propdown