class_docstr: Most tests done in the base class LinearOperatorDerivedClassTest.
code: def operator_shapes_infos():
      shape_info = linear_operator_test_util.OperatorShapesInfo
      # non-batch operators (n, n) and batch operators.
      return [
          shape_info((1, 1)),
          shape_info((1, 6, 6)),
          shape_info((3, 4, 4)),
          shape_info((2, 1, 3, 3)),
      ]
  
imports: import contextlib
  import numpy
  import scipy.linalg
  from tensorflow.python.eager import backprop
  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 import variables
  from tensorflow.python.ops.linalg import linalg
  from tensorflow.python.ops.linalg import linear_operator_test_util
  from tensorflow.python.ops.linalg import linear_operator_toeplitz
  from tensorflow.python.platform import test
label_desc: Use image node_id 4 for calling the LinearOperatorToeplitzTest obj's underlying member method code with example usage: obj.operator_shapes_infos() and returns: list