code: def predict(self, obs):
      output_np = self.fluid_executor.run(
          self.predict_program,
          feed={"obs": obs},
          fetch_list=self.predict_output,
      )[0]
      return output_np
  
imports: import numpy
  import unittest
  from paddle import fluid
  from parl import layers
  import parl
  import os
label_desc: Use image node_id 4 for calling the TestAgent obj's underlying member method code with example usage: obj.predict(obs) and returns: output_np