def normalise_tensor(self):
        """
        Normalise the tensor by dividing it by its norm, defined such that
        np.sqrt(X:X)
        """
        self.tensor, tensor_norm = utils.normalise_tensor(self.tensor)
        return self.tensor / tensor_norm, tensor_norm
Normalise the tensor by dividing it by its norm, defined such that
        np.sqrt(X:X)