code: def input_spec(self) -> lit_types.Spec:
      return {}
  
imports: from typing import Optional
  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
  from lit_nlp.components import shap_explainer
  from lit_nlp.lib import testing_utils
label_desc: Use image node_id 1 for calling the _EmptyTestModel obj's underlying member method code with example usage: obj.input_spec() and returns: dict