code: def value(self, obs, action):
      return self.critic_model.value(obs, action)
  
file_path: PARL/examples/NeurIPS2019-Learn-to-Move-Challenge/opensim_model.py
imports: import parl
  from parl import layers
  from paddle import fluid
  from paddle.fluid.param_attr import ParamAttr
label_desc: Use image node_id 3 for calling the OpenSimModel obj's underlying member method code with example usage: obj.value(obs, action) and returns: self