class_docstr: Dataset that consists of a subset of a previous dataset
  
  Args:
      dataset (torch.utils.data.Dataset): Complete dataset
      ids (list): List of subset IDs
code: def __getitem__(self, index):
      return self.dataset.__getitem__(self.ids[index])
  
file_path: torchbearer/torchbearer/cv_utils.py
imports: import math
  import torch
  from torch.utils.data import TensorDataset, Dataset
  import random
label_desc: Use image node_id 2 for calling the SubsetDataset obj's underlying member method code with example usage: obj.__getitem__(index) and returns: self