code: def main(argv):
      del argv
  
      contigs = fasta.IndexedFastaReader(_REF.value).header.contigs
      max_records = (
          _MAX_RECORDS.value if _MAX_RECORDS.value >= 0 else None
      )
      variants_iter = examples_to_variants(
          _EXAMPLES.value, max_records=max_records
      )
  
      if not _SAMPLE_NAME.value:
          sample_name, variants_iter = peek_sample_name(variants_iter)
      else:
          sample_name = _SAMPLE_NAME.value
      header = dv_vcf_constants.deepvariant_header(
          contigs=contigs, sample_names=[sample_name]
      )
      with vcf.VcfWriter(_OUTPUT_VCF.value, header=header) as writer:
          for variant in variants_iter:
              variant.calls[0].call_set_name = sample_name
              logging.log_every_n(
                  logging.INFO,
                  "Converted %s",
                  _LOG_EVERY.value,
                  variant_utils.variant_key(variant),
              )
              writer.write(variant)
  
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 4 for calling a global function with example usage: main(argv) without return types