code: def value(self, obs):
      obs = obs / 255.0
      out = self.conv1(obs)
      out = layers.pool2d(
          input=out, pool_size=2, pool_stride=2, pool_type="max"
      )
      out = self.conv2(out)
      out = layers.pool2d(
          input=out, pool_size=2, pool_stride=2, pool_type="max"
      )
      out = self.conv3(out)
      out = layers.pool2d(
          input=out, pool_size=2, pool_stride=2, pool_type="max"
      )
      out = self.conv4(out)
      out = layers.flatten(out, axis=1)
  
      Q = self.fc1(out)
      return Q
  
file_path: PARL/benchmark/fluid/Prioritized_DQN/atari_model.py
imports: import numpy
  import paddle.fluid
  import parl
  from parl import layers
label_desc: Use image node_id 2 for calling the AtariModel obj's underlying member method code with example usage: obj.value(obs) and returns: Q