class_docstr: Most tests done in the base class LinearOperatorDerivedClassTest.
class_docstr_tok: ["Most","tests","done","in","the","base","class","LinearOperatorDerivedClassTest","."]
code: def test_llt_composition_with_pd_l(self):
      l = linalg_lib.LinearOperatorLowerTriangular(
          [[1.0, 0.0], [0.5, 0.2]],
          is_non_singular=True,
          is_positive_definite=True,
      )
      self.assertIs(l, (l @ l.H).cholesky())
  
imports: from tensorflow.python.framework import config
  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 9 for calling the LinearOperatorLowerTriangularTest obj's underlying member method code with example usage: obj.test_llt_composition_with_pd_l() without return types