code: def _get_variable_name(self, var_name):
      return var_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 3 for calling the Resolver obj's underlying member method code with example usage: obj._get_variable_name(var_name) and returns: var_name