code: def deleteEdge(self, a, b=None):
      if b:
          self._NNModule.dataFlow().deleteEdge(a, b)
      else:
          self._NNModule.dataFlow().deleteEdge(a)
  
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 10 for calling the NNModule obj's underlying member method code with example usage: obj.deleteEdge(a, b) without return types