code: def test_RandomModelGenUnconstrained(self) -> None:
      with self.assertRaises(NotImplementedError):
          self.random_model._gen_unconstrained(
              n=1, d=2, tunable_feature_indices=np.array([])
          )
  
file_path: Ax/ax/models/tests/test_random.py
imports: import numpy
  import torch
  from ax.models.random.base import RandomModel
  from ax.utils.common.testutils import TestCase
  from ax.utils.common.typeutils import not_none
label_desc: Use image node_id 4 for calling the RandomModelTest obj's underlying member method code with example usage: obj.test_RandomModelGenUnconstrained() without return types