code: def __init__(self):
      self.fc1 = layers.fc(size=256)
      self.fc2 = layers.fc(size=128)
      self.fc3 = layers.fc(size=1)
  
imports: import numpy
  import paddle.fluid
  import parl
  import unittest
  from copy import deepcopy
  from paddle.fluid import ParamAttr
  from parl import layers
  from parl.utils import get_gpu_count
  from parl.core.fluid.plutils import fetch_value
label_desc: Use image node_id 1 to create a new TestModel4 object from inherited base classes: parl with example: obj = TestModel4()