class_docstr: Most tests done in the base class LinearOperatorDerivedClassTest.
code: def setUp(self):
      self.tf32_keep_ = config.tensor_float_32_execution_enabled()
      config.enable_tensor_float_32_execution(False)
      # Increase from 1e-6 to 1e-4 and 2e-4.
      self._atol[dtypes.float32] = 2e-4
      self._atol[dtypes.complex64] = 1e-4
      self._rtol[dtypes.float32] = 2e-4
      self._rtol[dtypes.complex64] = 1e-4
  
imports: import numpy
  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 math_ops
  from tensorflow.python.ops.linalg import linalg
  from tensorflow.python.ops.linalg import linear_operator_test_util
  from tensorflow.python.platform import test
label_desc: Use image node_id 2 for calling the SquareLinearOperatorCompositionTest obj's underlying member method code with example usage: obj.setUp() without return types