code: def __init__(self, algorithm, act_dim, update_freq):
      super(AtariAgent, self).__init__(algorithm)
      assert isinstance(act_dim, int)
      self.act_dim = act_dim
      self.exploration = 1.0
      self.global_step = 0
      self.update_target_steps = 10000 // 4
      self.update_freq = update_freq
  
file_path: PARL/benchmark/fluid/Prioritized_DQN/atari_agent.py
imports: import numpy
  import paddle.fluid
  import parl
  from parl import layers
label_desc: Use image node_id 1 to create a new AtariAgent object from inherited base classes: parl with example: obj = AtariAgent(algorithm, act_dim, update_freq)