code: def get_ann_id():
      """Return unique annotation id across images."""
      global GLOBAL_ANN_ID
      GLOBAL_ANN_ID += 1
      return GLOBAL_ANN_ID
  
file_path: DALI/docs/examples/use_cases/tensorflow/efficientdet/dataset/create_pascal_tfrecord.py
imports: import hashlib
  import io
  import json
  import os
  from absl import app
  from absl import flags
  from absl import logging
  from lxml import etree
  import PIL.Image
  import tensorflow
  from dataset import tfrecord_util
label_desc: Use image node_id 2 for calling a global function with example usage: get_ann_id() and returns: GLOBAL_ANN_ID