code: def alt_from_example(example):
      """Get alt allele(s) from a DeepVariant example.
  
      Args:
        example: a DeepVariant make_examples output example.
  
      Returns:
        str. The bases of the alt alleles, joined by a -.
      """
      variant = variant_from_example(example)
      indices = alt_allele_indices_from_example(example)
      return alt_bases_from_indices(indices, variant.alternate_bases)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import enum
  import math
  from typing import List, NamedTuple, Tuple
  from etils import epath
  from IPython import display
  import numpy
  from PIL import Image
  from PIL import ImageDraw
  from third_party.nucleus.protos import variants_pb2
label_desc: Use image node_id 17 for calling a global function with example usage: alt_from_example(example) and returns: alt_bases_from_indices