text: import unittest
  
  import ray
  import ray.rllib.agents.es as es
  from ray.rllib.utils.test_utils import check_compute_single_action, \
      framework_iterator
  
  
  class TestES(unittest.TestCase):
      def test_es_compilation(self):
          """Test whether an ESTrainer can be built on all frameworks."""
          ray.init(num_cpus=2)
          config = es.DEFAULT_CONFIG.copy()
          # Keep it simple.
          config["model"]["fcnet_hiddens"] = [10]
          config["model"]["fcnet_activation"] = None
          config["noise_size"] = 2500000
          config["num_workers"] = 1
          config["episodes_per_batch"] = 10
          config["train_batch_size"] = 100
  
          num_iterations = 1
  
          for _ in framework_iterator(config):
              plain_config = config.copy()
              trainer = es.ESTrainer(config=plain_config, env="CartPole-v0")
              for i in range(num_iterations):
                  results = trainer.train()
                  print(results)
  
              check_compute_single_action(trainer)
              trainer.stop()
          ray.shutdown()
  
  
  if __name__ == "__main__":
      import pytest
      import sys
      sys.exit(pytest.main(["-v", __file__]))
  