code: def join_name(self, name):
      v_name = "_".join(
          [self.model_name, name, str(self.fork_name_number)]
      )
      self.fork_name_number += 1
      return v_name
  
file_path: nnabla/python/src/nnabla/utils/converter/nnablart/resolver.py
imports: from collections import OrderedDict
  import nnabla
  import nnabla.functions
  import numpy
  from nnabla.utils import nnabla_pb2
  from nnabla.utils.save_function import _create_function_nntxt
label_desc: Use image node_id 2 for calling the ProtoGenerator obj's underlying member method code with example usage: obj.join_name(name) and returns: v_name