code: def value(self, obs):
      obs = torch.FloatTensor(obs).to(self.device)
      values = self.alg.value(obs)
      return values
  
file_path: PARL/benchmark/torch/a2c/atari_agent.py
imports: import torch
  import parl
  from parl.utils.scheduler import PiecewiseScheduler, LinearDecayScheduler
  import numpy
label_desc: Use image node_id 4 for calling the Agent obj's underlying member method code with example usage: obj.value(obs) and returns: values