code: def test_default_hparams(self):
      hparam = CAV.default_hparams()
      self.assertEqual(hparam["alpha"], 0.01)
      self.assertEqual(hparam["model_type"], "linear")
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import pickle
  import shutil
  import numpy
  import tensorflow
  from sklearn import linear_model
  from six.moves import range
  from tcav.cav import CAV, get_or_train_cav
  from tensorflow.python.platform import flags
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 2 for calling the CavTest obj's underlying member method code with example usage: obj.test_default_hparams() without return types