code: def __init__(self, obs_dim, act_dim):
      super(Critic, self).__init__()
      hid_size = 100
  
      self.l1 = nn.Linear(obs_dim + act_dim, hid_size)
      self.l2 = nn.Linear(hid_size, 1)
  
file_path: PARL/examples/tutorials/parl2_dygraph/lesson5/ddpg/model.py
imports: import parl
  import paddle
  import paddle.nn
  import paddle.nn.functional
label_desc: Use image node_id 1 to create a new Critic object from inherited base classes: parl with example: obj = Critic(obs_dim, act_dim)