code: def __len__(self) -> int:
      pass
  
imports: import array
  from abc import ABC, abstractmethod
  from math import atan, tan
  from typing import Tuple
  import numpy
  from darts.logging import raise_if, raise_if_not
label_desc: Use image node_id 2 for calling the Window obj's underlying member method code with example usage: obj.__len__() without return types