code: def match(self, pattern):
      for n in self.dataFlow.getMutableNodes():
          m = C.matchSubgraph(n, pattern)
          if m:
              yield m
  
imports: import errno
  import os
  from subprocess import PIPE, Popen
  import caffe2.python._import_c_extension
  from caffe2.proto import caffe2_pb2
  from caffe2.python import core
label_desc: Use image node_id 19 for calling the NNModule obj's underlying member method code with example usage: obj.match(pattern) without return types