class_docstr: Most tests done in the base class LinearOperatorDerivedClassTest.
code: def test_inverse_of_inverse(self):
      # The matrix values do not effect auto-setting of the flags.
      matrix = [[1.0, 0.0], [1.0, 1.0]]
      operator = linalg.LinearOperatorFullMatrix(matrix)
      operator_inv = operator.inverse()
      self.assertIsInstance(operator_inv, LinearOperatorInversion)
      inverse_of_op_inverse = operator_inv.inverse()
      self.assertIsInstance(
          inverse_of_op_inverse, linalg.LinearOperatorFullMatrix
      )
  
imports: from tensorflow.python.framework import config
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.ops.linalg import linalg
  from tensorflow.python.ops.linalg import linear_operator_inversion
  from tensorflow.python.ops.linalg import linear_operator_test_util
  from tensorflow.python.platform import test
label_desc: Use image node_id 8 for calling the LinearOperatorInversionTest obj's underlying member method code with example usage: obj.test_inverse_of_inverse() without return types