class_docstr: Most tests done in the base class LinearOperatorDerivedClassTest.
  
  In this test, the operator is constructed with hints that invoke the use of
  a Cholesky decomposition for solves/determinant.
code: def dtypes_to_test():
      return [dtypes.float32, dtypes.float64]
  
imports: import numpy
  from tensorflow.python.framework import config
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  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.platform import test
label_desc: Use image node_id 2 for calling the SquareLinearOperatorFullMatrixSymmetricPositiveDefiniteTest obj's underlying member method code with example usage: obj.dtypes_to_test() and returns: list