code: def test_count_base_changes_and_indel_sizes(self):
      variant_stats_lite = collections.namedtuple(
          "variant_stats_lite",
          [
              "reference_bases",
              "alternate_bases",
              "is_variant",
              "variant_type",
          ],
      )
      variant_stats = [
          variant_stats_lite(
              reference_bases="A",
              alternate_bases=["G"],
              is_variant=True,
              variant_type=vcf_stats.BIALLELIC_SNP,
          ),
          variant_stats_lite(
              reference_bases="A",
              alternate_bases=["AGGG"],
              is_variant=True,
              variant_type=vcf_stats.BIALLELIC_INSERTION,
          ),
          variant_stats_lite(
              reference_bases="A",
              alternate_bases=["G"],
              is_variant=False,
              variant_type=vcf_stats.REFCALL,
          ),
          variant_stats_lite(
              reference_bases="A",
              alternate_bases=["G", "T"],
              is_variant=True,
              variant_type=vcf_stats.MULTIALLELIC_COMPLEX,
          ),
      ]
      truth_base_changes = [["A", "G", 1]]
      truth_indel_sizes = [[3, 1]]
      (
          base_changes,
          indel_sizes,
      ) = vcf_stats._count_base_changes_and_indel_sizes(variant_stats)
      self.assertEqual(base_changes, truth_base_changes)
      self.assertEqual(indel_sizes, truth_indel_sizes)
  
imports: import collections
  import json
  import os
  import tempfile
  from absl.testing import absltest
  from absl.testing import parameterized
  import tensorflow
  from deepvariant import testdata
  from deepvariant import vcf_stats
  from third_party.nucleus.io import vcf
  from third_party.nucleus.testing import test_utils
  from third_party.nucleus.util import variant_utils
  from third_party.nucleus.util import variantcall_utils
label_desc: Use image node_id 9 for calling the VcfStatsTest obj's underlying member method code with example usage: obj.test_count_base_changes_and_indel_sizes() without return types