class_docstr: Most tests done in the base class LinearOperatorDerivedClassTest.
class_docstr_tok: ["Most","tests","done","in","the","base","class","LinearOperatorDerivedClassTest","."]
code: def test_convert_variables_to_tensors(self):
      operator_1 = linalg.LinearOperatorFullMatrix(
          variables_module.Variable([[1.0, 0.0], [0.0, 1.0]]),
          is_self_adjoint=True,
          is_positive_definite=True,
      )
      operator_2 = linalg.LinearOperatorFullMatrix(
          variables_module.Variable([[2.0, 0.0], [1.0, 0.0]])
      )
      operator_3 = linalg.LinearOperatorFullMatrix(
          variables_module.Variable([[3.0, 1.0], [1.0, 3.0]]),
          is_self_adjoint=True,
          is_positive_definite=True,
      )
      operator = (
          block_lower_triangular.LinearOperatorBlockLowerTriangular(
              [[operator_1], [operator_2, operator_3]],
              is_self_adjoint=False,
              is_positive_definite=True,
          )
      )
      with self.cached_session() as sess:
          sess.run([x.initializer for x in operator.variables])
          self.check_convert_variables_to_tensors(operator)
  
imports: import numpy
  from tensorflow.python.eager import backprop
  from tensorflow.python.eager import context
  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_block_lower_triangular
  from tensorflow.python.ops.linalg import linear_operator_test_util
  from tensorflow.python.ops.linalg import linear_operator_util
  from tensorflow.python.platform import test
label_desc: Use image node_id 10 for calling the SquareLinearOperatorBlockLowerTriangularTest obj's underlying member method code with example usage: obj.test_convert_variables_to_tensors() without return types