class_docstr: Dummy model for testing Model.is_compatible_with_dataset().
code: def __init__(self, input_spec: types.Spec):
      self._input_spec = input_spec
  
imports: from absl.testing import absltest
  from absl.testing import parameterized
  from lit_nlp.api import dataset
  from lit_nlp.api import model
  from lit_nlp.api import types
label_desc: Use image node_id 1 to create a new _CompatibilityTestModel object from inherited base classes: model with example: obj = _CompatibilityTestModel(input_spec)