code: def test_update(self):
      DummyBatch = collections.namedtuple("EpisodeBatch", ["lengths"])
      batch = DummyBatch(np.array([1, 2, 3]))
      self.epsilon_greedy_policy.update(batch)
      assert np.isclose(self.epsilon_greedy_policy._epsilon(), 0.412)
  
file_path: garage/tests/garage/np/exploration_strategies/test_epsilon_greedy_policy.py
imports: import collections
  import pickle
  import numpy
  from garage.np.exploration_policies import EpsilonGreedyPolicy
  from tests.fixtures.envs.dummy import DummyDiscreteEnv
label_desc: Use image node_id 4 for calling the TestEpsilonGreedyPolicy obj's underlying member method code with example usage: obj.test_update() without return types