code: def test_export_labels(self):
      export_path = os.path.join(self.get_temp_dir(), "export/")
      self.model.export_labels(export_dir=export_path)
      self._check_nonempty_file(os.path.join(export_path, "labels.txt"))
  
file_path: mediapipe/mediapipe/model_maker/python/core/tasks/classifier_test.py
imports: import os
  import tensorflow
  from mediapipe.model_maker.python.core.tasks import classifier
  from mediapipe.model_maker.python.core.utils import test_util
label_desc: Use image node_id 3 for calling the ClassifierTest obj's underlying member method code with example usage: obj.test_export_labels() without return types