code: def read_image_bytes(filename):
      with open(
          filename,
          "rb",
      ) as fin:
          image_bytes = fin.read()
      return image_bytes
  
imports: import asyncio
  import json
  import random
  import shutil
  from pathlib import Path
  from unittest.mock import patch
  from zipfile import ZIP_STORED, ZipFile
  import pytest
  import requests
  import test_utils
  import yaml
  from model_archiver import ModelArchiverConfig
  from torchvision.models.resnet import ResNet18_Weights
  from ts.torch_handler.unit_tests.test_utils.model_dir import download_model
label_desc: Use image node_id 1 for calling a global function with example usage: read_image_bytes(filename) and returns: image_bytes