class_docstr: Most tests done in the base class LinearOperatorDerivedClassTest.
class_docstr_tok: ["Most","tests","done","in","the","base","class","LinearOperatorDerivedClassTest","."]
code: def test_triangular_diag_matmul(self):
      operator1 = linalg_lib.LinearOperatorLowerTriangular(
          [[1.0, 0.0, 0.0], [2.0, 1.0, 0.0], [2.0, 3.0, 3.0]]
      )
      operator2 = linalg_lib.LinearOperatorDiag([2.0, 2.0, 3.0])
      operator_matmul = operator1.matmul(operator2)
      self.assertTrue(
          isinstance(
              operator_matmul, linalg_lib.LinearOperatorLowerTriangular
          )
      )
      self.assertAllClose(
          math_ops.matmul(operator1.to_dense(), operator2.to_dense()),
          self.evaluate(operator_matmul.to_dense()),
      )
  
      operator_matmul = operator2.matmul(operator1)
      self.assertTrue(
          isinstance(
              operator_matmul, linalg_lib.LinearOperatorLowerTriangular
          )
      )
      self.assertAllClose(
          math_ops.matmul(operator2.to_dense(), operator1.to_dense()),
          self.evaluate(operator_matmul.to_dense()),
      )
  
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 6 for calling the LinearOperatorLowerTriangularTest obj's underlying member method code with example usage: obj.test_triangular_diag_matmul() without return types