code: def get_num_batches(self):
      return math.ceil(len(self.dataset) / self.batch_size)
  
imports: import copy
  import math
  import os
  import torch
  import torch.nn
  import torch.nn.functional
  from torch.utils.data import Dataset, DataLoader
label_desc: Use image node_id 2 for calling the DataLoaderWithLength obj's underlying member method code with example usage: obj.get_num_batches() and returns: math