code: def __len__(self):
      return self.len_preds
  
imports: import bisect
  from abc import ABC, abstractmethod
  from typing import Optional, Sequence, Tuple, Union
  import numpy
  import pandas
  from torch.utils.data import Dataset
  from darts import TimeSeries
  from darts.logging import get_logger, raise_log
  from darts.utils.historical_forecasts.utils import _process_predict_start_points_bounds
  from .utils import CovariateType
label_desc: Use image node_id 2 for calling the GenericInferenceDataset obj's underlying member method code with example usage: obj.__len__() and returns: self