class_docstr: CORe50 Pytorch Dataset
class_docstr_tok: ["CORe50","Pytorch","Dataset"]
code: def __len__(self):
      return len(self.targets)
  
imports: import glob
  import os
  import pickle
  from pathlib import Path
  from typing import List, Optional, Tuple, Union
  from warnings import warn
  from torchvision.datasets.folder import default_loader
  from torchvision.transforms import ToTensor
  from avalanche.benchmarks.datasets.core50 import core50_data
  from avalanche.benchmarks.datasets import default_dataset_location
  from avalanche.benchmarks.datasets.downloadable_dataset import DownloadableDataset
label_desc: Use image node_id 3 for calling the CORe50Dataset obj's underlying member method code with example usage: obj.__len__() and returns: len