code: def _check_nonempty_file(self, filepath):
      self.assertTrue(os.path.isfile(filepath))
      self.assertGreater(os.path.getsize(filepath), 0)
  
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 2 for calling the ClassifierTest obj's underlying member method code with example usage: obj._check_nonempty_file(filepath) without return types