code: def test_delete_subgraph(self):
      mg = ng.NNMatchGraph()
      test2m = mg.createNode(ng.NeuralNetOperator("test2"), strict=True)
      xm = mg.createNode(ng.NeuralNetData("X"), strict=True)
      testm = mg.createNode(ng.NeuralNetOperator("test"))
      mg.createEdge(test2m, xm)
      mg.createEdge(xm, testm)
  
      nn = ng.NNModule()
      test2 = nn.dataFlow.createNode(ng.NeuralNetOperator("test2"))
      x = nn.dataFlow.createNode(ng.NeuralNetData("X"))
      test = nn.dataFlow.createNode(ng.NeuralNetOperator("test"))
      nn.dataFlow.createEdge(test2, x)
      nn.dataFlow.createEdge(x, test)
  
      for m in nn.match(mg):
          match = m
      nn.deleteSubgraph(match)
      assert len(nn.controlFlow) == 0
  
imports: from caffe2.python import core, test_util
  from caffe2.proto import caffe2_pb2
  import caffe2.python.nomnigraph
  from hypothesis import given
  import hypothesis.strategies
  import random
label_desc: Use image node_id 15 for calling the TestBindings obj's underlying member method code with example usage: obj.test_delete_subgraph() without return types