code: def __init__(self, obs_dim, act_dim, init_logvar):
      self.obs_dim = obs_dim
      self.act_dim = act_dim
      hid1_size = obs_dim * 10
      hid3_size = act_dim * 10
      hid2_size = int(np.sqrt(hid1_size * hid3_size))
  
      self.lr = 9e-4 / np.sqrt(hid2_size)
  
      self.fc1 = layers.fc(size=hid1_size, act="tanh")
      self.fc2 = layers.fc(size=hid2_size, act="tanh")
      self.fc3 = layers.fc(size=hid3_size, act="tanh")
      self.fc4 = layers.fc(size=act_dim, act="tanh")
  
      self.logvars = layers.create_parameter(
          shape=[act_dim],
          dtype="float32",
          default_initializer=fluid.initializer.ConstantInitializer(
              init_logvar
          ),
      )
  
file_path: PARL/benchmark/fluid/PPO/mujoco_model.py
imports: import numpy
  import parl
  from parl import layers
  from paddle import fluid
  from paddle.fluid.param_attr import ParamAttr
label_desc: Use image node_id 1 to create a new PolicyModel object from inherited base classes: parl with example: obj = PolicyModel(obs_dim, act_dim, init_logvar)