code: def __len__(self):
      return len(self.labels)
  
imports: import os
  import json
  import h5py
  import numpy
  import torch
  import copy
  from ordered_set import OrderedSet
  from torchmeta.utils.data import Task, MetaDataset
  from torchmeta.datasets.utils import get_asset
label_desc: Use image node_id 4 for calling the TCGATask obj's underlying member method code with example usage: obj.__len__() and returns: len