code: def testIsLoopMerge(self):
      g = self.build_test_graph()
      loop_merges = [
          "OuterCond/cond/OuterWhile/while/Merge",
      ]
      for n in g.get_operations():
          if n.name in loop_merges:
              self.assertTrue(control_flow_util.IsMerge(n))
              self.assertFalse(control_flow_util.IsCondMerge(n))
              self.assertTrue(control_flow_util.IsLoopMerge(n))
          else:
              self.assertFalse(control_flow_util.IsLoopMerge(n))
              self.assertTrue(
                  not control_flow_util.IsMerge(n)
                  or control_flow_util.IsCondMerge(n)
              )
  
imports: from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import cond
  from tensorflow.python.ops import control_flow_ops
  from tensorflow.python.ops import control_flow_util
  from tensorflow.python.ops import gen_control_flow_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import while_loop
  from tensorflow.python.platform import test
label_desc: Use image node_id 8 for calling the ControlFlowUtilTest obj's underlying member method code with example usage: obj.testIsLoopMerge() without return types