code: def __getitem__(
      self, idx: int
  ) -> Tuple[
      np.ndarray,
      Optional[np.ndarray],
      Optional[np.ndarray],
      Optional[np.ndarray],
      np.ndarray,
  ]:
      pass
  
imports: from abc import ABC, abstractmethod
  from typing import Dict, Optional, Tuple
  import numpy
  from torch.utils.data import Dataset
  from darts import TimeSeries
  from darts.logging import get_logger, raise_if_not
  from .utils import CovariateType
label_desc: Use image node_id 2 for calling the DualCovariatesTrainingDataset obj's underlying member method code with example usage: obj.__getitem__(idx) without return types