code: def _numpy_update(self, target_model, decay):
      model_fc1_w = fetch_value("fc1.w")
      model_fc1_b = fetch_value("fc1.b")
      model_fc2_w = fetch_value("fc2.w")
      model_fc2_b = fetch_value("fc2.b")
      model_fc3_w = fetch_value("fc3.w")
      model_fc3_b = fetch_value("fc3.b")
  
      unique_id = target_model.parameters()[0].split("_")[-1]
      target_model_fc1_w = fetch_value(
          "PARL_target_fc1.w_{}".format(unique_id)
      )
      target_model_fc1_b = fetch_value(
          "PARL_target_fc1.b_{}".format(unique_id)
      )
      target_model_fc2_w = fetch_value(
          "PARL_target_fc2.w_{}".format(unique_id)
      )
      target_model_fc2_b = fetch_value(
          "PARL_target_fc2.b_{}".format(unique_id)
      )
      target_model_fc3_w = fetch_value(
          "PARL_target_fc3.w_{}".format(unique_id)
      )
      target_model_fc3_b = fetch_value(
          "PARL_target_fc3.b_{}".format(unique_id)
      )
  
      # updated self.target_model parameters value in numpy way
      target_model_fc1_w = (
          decay * target_model_fc1_w + (1 - decay) * model_fc1_w
      )
      target_model_fc1_b = (
          decay * target_model_fc1_b + (1 - decay) * model_fc1_b
      )
      target_model_fc2_w = (
          decay * target_model_fc2_w + (1 - decay) * model_fc2_w
      )
      target_model_fc2_b = (
          decay * target_model_fc2_b + (1 - decay) * model_fc2_b
      )
      target_model_fc3_w = (
          decay * target_model_fc3_w + (1 - decay) * model_fc3_w
      )
      target_model_fc3_b = (
          decay * target_model_fc3_b + (1 - decay) * model_fc3_b
      )
  
      return (
          target_model_fc1_w,
          target_model_fc1_b,
          target_model_fc2_w,
          target_model_fc2_b,
          target_model_fc3_w,
          target_model_fc3_b,
      )
  
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 8 for calling the ModelBaseTest obj's underlying member method code with example usage: obj._numpy_update(target_model, decay) and returns: target_model_fc1_w,  target_model_fc1_b,  target_model_fc2_w,  target_model_fc2_b,  target_model_fc3_w,  target_model_fc3_b