code: def save(self):
      np.save(self.path, self.data)
  
imports: import math
  import os
  import random
  import sys
  import time
  import warnings
  import numpy
  import numpy
  import shutil
  import logging
  import torch
  import torchvision.transforms
  import torchvision.datasets
  import torch.nn
label_desc: Use image node_id 3 for calling the Performance obj's underlying member method code with example usage: obj.save() without return types