mlp.py 文件源码

def l2_decay(self, gamma, layers=None):
        '''L2 decay cost.

        Args:
            gamma (float): l2 decay rate.
            layers (Optional[list]): layer numbers to do l2 decay on.

        Returns:
            T.tensor: L2 cost.

        '''
        if layers is None:
            layers = range(self.n_layers)

        cost = T.constant(0.).astype(floatX)
        for l in layers:
            W = self.__dict__['W%d' % l]
            cost += gamma * (W ** 2).sum()

        return cost