code: def example_alt_alleles_indices(example):
      """Gets an iterable of the alt allele indices in example."""
      return deepvariant_pb2.CallVariantsOutput.AltAlleleIndices.FromString(
          example.features.feature[
              "alt_allele_indices/encoded"
          ].bytes_list.value[0]
      ).indices
  
imports: import json
  from typing import Optional
  from absl import logging
  import numpy
  import tensorflow
  from deepvariant.protos import deepvariant_pb2
  from third_party.nucleus.io import sharded_file_utils
  from third_party.nucleus.io import tfrecord
  from third_party.nucleus.protos import variants_pb2
  from tensorflow.core.example import example_pb2
label_desc: Use image node_id 3 for calling a global function with example usage: example_alt_alleles_indices(example) and returns: deepvariant_pb2