code: def testInvalidPriorScaleRaises(self):
      with self.assertRaisesRegex(ValueError, "not a valid value"):
          radon_contextual_effects.RadonContextualEffects(
              prior_scale="invalid_input",
              **_test_dataset(train_size=20),
          )
  
imports: import functools
  from absl.testing import parameterized
  import numpy
  import tensorflow.compat.v2
  from tensorflow_probability.python.internal import test_util
  from inference_gym.internal import test_util
  from inference_gym.targets import radon_contextual_effects
label_desc: Use image node_id 5 for calling the _RadonContextualEffectsTest obj's underlying member method code with example usage: obj.testInvalidPriorScaleRaises() without return types