code: def diagonalize(self):
          '''Diagonalize the tensor.'''
          self.eigvals, self.eigvecs = np.linalg.eig(
              (self.tensor.transpose() + self.tensor) / 2.0)
          self.eigvals = np.diag(np.dot(
              np.dot(self.eigvecs.transpose(), self.tensor), self.eigvecs)f diagonalize(self):
          '''Diagonalize the tensor.'''
          self.eigvals, self.eigvecs = np.linalg.eig(
              (self.tensor.transpose() + self.tensor) / 2.0)
          self.eigvals = np.diag(np.dot(
              np.dot(self.eigvecs.transpose(), self.tensor), self.eigvecs))
docs: Diagonalize the tensor.