class_docstr: A test model for testing the regression case.
class_docstr_tok: ["A","test","model","for","testing","the","regression","case","."]
code: def output_spec(self):
      return {
          "pred": lit_types.RegressionScore(),
          "grads": lit_types.ImageGradients(align="image"),
      }
  
imports: from absl.testing import absltest
  from lit_nlp.api import dataset
  from lit_nlp.api import model
  from lit_nlp.api import types
  from lit_nlp.components import image_gradient_maps
  from lit_nlp.lib import image_utils
  import numpy
  from PIL import Image
label_desc: Use image node_id 4 for calling the RegressionTestModel obj's underlying member method code with example usage: obj.output_spec() and returns: dict