code: def test_format_histogram_for_vega(self):
      # s = bin_start, e = bin_end, c = count
      self.assertEqual(
          vcf_stats._format_histogram_for_vega(
              counts=[2, 2], bins=[1, 2.5, 4]
          ),
          [{"s": 1, "e": 2.5, "c": 2}, {"s": 2.5, "e": 4, "c": 2}],
      )
  
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 6 for calling the VcfStatsTest obj's underlying member method code with example usage: obj.test_format_histogram_for_vega() without return types