code: def set_data_loader(self, data_loader):
      self.data_loader = data_loader
  
imports: import torch
  import torch.nn
  from torch.autograd import Variable
  import torch.optim
  import os
  import time
  import sys
  import datetime
  import ctypes
  import json
  import numpy
  from sklearn.metrics import roc_auc_score
  import copy
  from tqdm import tqdm
label_desc: Use image node_id 3 for calling the Tester obj's underlying member method code with example usage: obj.set_data_loader(data_loader) without return types