code: def __hash__(self):
      return hash((self.index, tuple(self.indices)))
  
imports: from torch.utils.data import ConcatDataset, Subset
  from torch.utils.data import Dataset
  from torchvision.transforms import Compose
label_desc: Use image node_id 3 for calling the SubsetTask obj's underlying member method code with example usage: obj.__hash__() and returns: hash