code: def _slice_if_not_none(a, idx):
      return None if a is None else a[idx]
  
file_path: privacy/tensorflow_privacy/privacy/privacy_tests/membership_inference_attack/dataset_slicing.py
imports: from collections import abc
  import copy
  import logging
  from typing import List, Optional
  import numpy
  from tensorflow_privacy.privacy.privacy_tests.membership_inference_attack.data_structures import AttackInputData
  from tensorflow_privacy.privacy.privacy_tests.membership_inference_attack.data_structures import SingleSliceSpec
  from tensorflow_privacy.privacy.privacy_tests.membership_inference_attack.data_structures import SlicingFeature
  from tensorflow_privacy.privacy.privacy_tests.membership_inference_attack.data_structures import SlicingSpec
label_desc: Use image node_id 1 for calling a global function with example usage: _slice_if_not_none(a, idx) and returns: unknown