class_docstr: Most tests done in the base class LinearOperatorDerivedClassTest.
class_docstr_tok: ["Most","tests","done","in","the","base","class","LinearOperatorDerivedClassTest","."]
code: def test_diag_matmul(self):
      operator1 = linalg_lib.LinearOperatorDiag([2.0, 3.0])
      operator2 = linalg_lib.LinearOperatorDiag([1.0, 2.0])
      operator3 = linalg_lib.LinearOperatorScaledIdentity(
          num_rows=2, multiplier=3.0
      )
      operator_matmul = operator1.matmul(operator2)
      self.assertTrue(
          isinstance(operator_matmul, linalg_lib.LinearOperatorDiag)
      )
      self.assertAllClose(
          [2.0, 6.0], self.evaluate(operator_matmul.diag)
      )
  
      operator_matmul = operator2.matmul(operator1)
      self.assertTrue(
          isinstance(operator_matmul, linalg_lib.LinearOperatorDiag)
      )
      self.assertAllClose(
          [2.0, 6.0], self.evaluate(operator_matmul.diag)
      )
  
      operator_matmul = operator1.matmul(operator3)
      self.assertTrue(
          isinstance(operator_matmul, linalg_lib.LinearOperatorDiag)
      )
      self.assertAllClose(
          [6.0, 9.0], self.evaluate(operator_matmul.diag)
      )
  
      operator_matmul = operator3.matmul(operator1)
      self.assertTrue(
          isinstance(operator_matmul, linalg_lib.LinearOperatorDiag)
      )
      self.assertAllClose(
          [6.0, 9.0], self.evaluate(operator_matmul.diag)
      )
  
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 linalg_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import random_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 14 for calling the LinearOperatorDiagTest obj's underlying member method code with example usage: obj.test_diag_matmul() without return types