code: def check_flags():
      """Additional logic to make sure flags are set appropriately."""
      if _CUSTOMIZED_MODEL_PARENT.value is not None:
          if not model_exists(_CUSTOMIZED_MODEL_PARENT.value):
              raise RuntimeError(
                  "The model files {}* do not exist. Potentially "
                  "relevant issue: "
                  "https://github.com/google/deepvariant/blob/r1.6/docs/"
                  "FAQ.md#why-cant-it-find-one-of-the-input-files-eg-"
                  "could-not-open".format(
                      _CUSTOMIZED_MODEL_PARENT.value
                  )
              )
          logging.info(
              (
                  "You set --customized_model_parent. Instead of using the default "
                  "model for %s, `call_variants` step will load %s* "
                  "instead."
              ),
              _MODEL_TYPE.value,
              _CUSTOMIZED_MODEL_PARENT.value,
          )
  
      if _CUSTOMIZED_MODEL_CHILD.value is not None:
          if not model_exists(_CUSTOMIZED_MODEL_CHILD.value):
              raise RuntimeError(
                  "The model files {}* do not exist. Potentially "
                  "relevant issue: "
                  "https://github.com/google/deepvariant/blob/r1.6/docs/"
                  "FAQ.md#why-cant-it-find-one-of-the-input-files-eg-"
                  "could-not-open".format(_CUSTOMIZED_MODEL_CHILD.value)
              )
          logging.info(
              (
                  "You set --customized_model_child. Instead of using the default "
                  "model for %s, `call_variants` step will load %s* "
                  "instead."
              ),
              _MODEL_TYPE.value,
              _CUSTOMIZED_MODEL_CHILD.value,
          )
  
imports: import enum
  import os
  import subprocess
  import sys
  import tempfile
  from typing import List, Optional
  from absl import app
  from absl import flags
  from absl import logging
  import tensorflow
label_desc: Use image node_id 22 for calling a global function with example usage: check_flags() without return types