code: def test_ParamDf(self) -> None:
      param_df = self.unweighted_run.param_df
      self.assertEqual(len(param_df), len(self.arms))
  
file_path: Ax/ax/core/tests/test_generator_run.py
imports: from ax.core.arm import Arm
  from ax.core.generator_run import GeneratorRun
  from ax.exceptions.core import UnsupportedError
  from ax.utils.common.testutils import TestCase
  from ax.utils.testing.core_stubs import get_arms, get_model_predictions, get_model_predictions_per_arm, get_optimization_config, get_search_space
label_desc: Use image node_id 8 for calling the GeneratorRunTest obj's underlying member method code with example usage: obj.test_ParamDf() without return types