code: def _make_labeler(self, variants, confident_regions):
      return positional_labeler.PositionalVariantLabeler(
          truth_vcf_reader=vcf.InMemoryVcfReader(variants),
          confident_regions=confident_regions,
      )
  
file_path: deepvariant/deepvariant/labeler/positional_labeler_test.py
imports: from absl.testing import absltest
  from absl.testing import parameterized
  from third_party.nucleus.io import vcf
  from third_party.nucleus.testing import test_utils
  from third_party.nucleus.util import ranges
  from deepvariant import testdata
  from deepvariant.labeler import positional_labeler
label_desc: Use image node_id 1 for calling the PositionalVariantLabelerTest obj's underlying member method code with example usage: obj._make_labeler(variants, confident_regions) and returns: positional_labeler