def weights(self, matrix_id=0):
        """
        Return the frame for the respective weight matrix.

        :param: matrix_id: an integer, ranging from 0 to number of layers, that specifies the weight matrix to return.
        :returns: an H2OFrame which represents the weight matrix identified by matrix_id
        """
        return {model.model_id: model.weights(matrix_id) for model in self.models}
Return the frame for the respective weight matrix.

        :param: matrix_id: an integer, ranging from 0 to number of layers, that specifies the weight matrix to return.
        :returns: an H2OFrame which represents the weight matrix identified by matrix_id