def loss(self, layers, outputs):
return <NUM_LIT:0.><EOL>
Compute a scalar term to add to the loss function for a model.

        Parameters
        ----------
        layers : list of :class:`theanets.layers.Layer`
            A list of the layers in the model being regularized.
        outputs : dict of Theano expressions
            A dictionary mapping string expression names to their corresponding
            Theano expressions in the computation graph. This dictionary
            contains the fully-scoped name of every layer output in the graph.