code: def predict(self, obs):
      obs = paddle.to_tensor(obs.astype(np.float32))
      output = self.alg.predict(obs)
      output_np = output.numpy()
      return output_np
  
imports: import numpy
  import unittest
  import paddle
  import paddle.nn
  import parl
  import os
label_desc: Use image node_id 2 for calling the TestAgent obj's underlying member method code with example usage: obj.predict(obs) and returns: output_np