code: def predict(self, obs):
      return self.model.value(obs)
  
file_path: PARL/benchmark/fluid/Prioritized_DQN/per_alg.py
imports: import copy
  import numpy
  import paddle.fluid
  import parl
  from parl.core.fluid import layers
label_desc: Use image node_id 2 for calling the PrioritizedDoubleDQN obj's underlying member method code with example usage: obj.predict(obs) and returns: self