code: def __getitem__(self, index: int) -> TimeSeries:
      ts, window = self._fetch(index)
      subseq = ts[window]
      return subseq
  
file_path: gluonts/src/gluonts/nursery/daf/tslib/dataset/windows.py
imports: from __future__ import annotations
  from typing import Optional, List, Tuple, Any
  from itertools import repeat
  from torch.utils.data import Dataset
  from tqdm import tqdm
  import numpy
  from .timeseries import TimeSeries, TimeSeriesCorpus
label_desc: Use image node_id 4 for calling the WindowsDataset obj's underlying member method code with example usage: obj.__getitem__(index) and returns: subseq