ERROR:ValueError: not enough values to unpack (expected 5, got 4)

• 问题描述：
  ValueError: not enough values to unpack (expected 5, got 4)

eg:
self.train_loader1, self.train_loader2, self.val_loader, self.test_loader, self.nclass = make_data_loader(args, **kwargs)

• 解决方案：
  期望返回值为5个，而相对应的函数获取这返回值中只有4个，所以相应改动；