class_docstr: Base class for forecasters that use sliding windows.
class_docstr_tok: ["Base","class","for","forecasters","that","use","sliding","windows","."]
code: def __init__(self, window_length=None):
      super().__init__()
      self.window_length = window_length
      self.window_length_ = None
  
file_path: sktime/sktime/forecasting/base/_sktime.py
imports: import numpy
  import pandas
  from sktime.forecasting.base._base import BaseForecaster
  from sktime.split import CutoffSplitter
  from sktime.utils.datetime import _shift
label_desc: Use image node_id 1 to create a new _BaseWindowForecaster object from inherited base classes: BaseForecaster with example: obj = _BaseWindowForecaster(window_length)