code: def input_spec(self) -> types.Spec:
      return self._input_spec
  
file_path: lit/lit_nlp/components/ablation_flip_test.py
imports: from collections.abc import Callable
  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 ablation_flip
  from lit_nlp.lib import testing_utils
label_desc: Use image node_id 2 for calling the _ClassificationTestModel obj's underlying member method code with example usage: obj.input_spec() and returns: self