code: def _example_sort_key(example):
      return variant_utils.variant_range_tuple(
          dv_utils.example_variant(example)
      )
  
file_path: deepvariant/deepvariant/labeler/labeled_examples_to_vcf.py
imports: import itertools
  from absl import app
  from absl import flags
  from absl import logging
  from deepvariant import dv_utils
  from deepvariant import dv_vcf_constants
  from third_party.nucleus.io import fasta
  from third_party.nucleus.io import tfrecord
  from third_party.nucleus.io import vcf
  from third_party.nucleus.util import variant_utils
  from third_party.nucleus.util import variantcall_utils
label_desc: Use image node_id 1 for calling a global function with example usage: _example_sort_key(example) and returns: variant_utils