code: def learn(self, obs, label):
      output_np = self.fluid_executor.run(
          self.learn_program, feed={"obs": obs, "label": label}
      )
  
imports: import numpy
  import unittest
  from paddle import fluid
  from parl import layers
  import parl
  import os
label_desc: Use image node_id 3 for calling the TestAgent obj's underlying member method code with example usage: obj.learn(obs, label) without return types