code: def test_validate_model(self, results: list[types.JsonDict]):
      in_spec = {
          "score": types.Scalar(),
          "text": types.TextSegment(),
      }
      out_spec = {
          "res": types.RegressionScore(parent="score"),
          "grad": types.Gradients(required=False),
      }
      datapoints = [
          {"score": 0, "text": "a"},
          {"score": 1, "text": "b"},
      ]
      ds = dataset.Dataset(in_spec, datapoints)
      model = testing_utils.CustomOutputModelForTesting(
          in_spec, out_spec, results
      )
      try:
          validation.validate_model(model, ds)
      except ValueError:
          self.fail("Raised unexpected error.")
  
file_path: lit/lit_nlp/lib/validation_test.py
imports: from absl.testing import absltest
  from absl.testing import parameterized
  from lit_nlp.api import dataset
  from lit_nlp.api import types
  from lit_nlp.lib import testing_utils
  from lit_nlp.lib import validation
label_desc: Use image node_id 7 for calling the ValidationTest obj's underlying member method code with example usage: obj.test_validate_model(results) without return types