code: def image_bytes():
      with open(
          REPO_DIR.joinpath("examples/image_segmenter/persons.jpg"),
          "rb",
      ) as fin:
          image_bytes = fin.read()
      return image_bytes
  
file_path: serve/ts/torch_handler/unit_tests/test_object_detector.py
imports: import sys
  from pathlib import Path
  import pytest
  from ts.torch_handler.object_detector import ObjectDetector
  from .test_utils.mock_context import MockContext
  from .test_utils.model_dir import copy_files, download_model
label_desc: Use image node_id 1 for calling a global function with example usage: image_bytes() and returns: image_bytes