class_docstr: A placeholder VariantLabeler.
  
  This class provides a label_variants implementation and so allows the base
  class to be instantiated and its methods tested.
class_docstr_tok: ["A","placeholder","VariantLabeler",".","This","class","provides","a","label_variants","implementation","and","so","allows","the","base","class","to","be","instantiated","and","its","methods","tested","."]
code: def __init__(self, *pos, **kwargs):
      super(PlaceholderVariantLabeler, self).__init__(*pos, **kwargs)
  
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 variant_labeler
label_desc: Use image node_id 1 to create a new PlaceholderVariantLabeler object from inherited base classes: variant_labeler with example: obj = PlaceholderVariantLabeler()