code: def execute(self, *args):
      if len(args) == 1:
          if os.path.isdir(args[0]):
              self._export_files(args[0])
          else:
              ofile = args[0]
              ext = os.path.splitext(ofile)[1].lower()
              if ext == ".nnp":
                  self._export_nnp(ofile)
  
file_path: nnabla/python/src/nnabla/utils/converter/nnabla/exporter.py
imports: import glob
  import os
  import shutil
  import tempfile
  import warnings
  import zipfile
  import google.protobuf.text_format
  import numpy
  from nnabla.utils import nnabla_pb2
  from nnabla.logger import logger
label_desc: Use image node_id 7 for calling the NnpExporter obj's underlying member method code with example usage: obj.execute() without return types