docstr: Build a ExpandingSliding object.
  
  Parameters
  ----------
  initial_length: int, Initial length of the input window.
  start_step: int, Initial step size.
  end_step: int, Final step size.
docstr_tok: ["Build","a","ExpandingSliding","object",".","Parameters","--","--","--","--","--","initial_length",":","int",",","Initial","length","of","the","input","window",".","start_step",":","int",",","Initial","step","size",".","end_step",":","int",",","Final","step","size","."]
code: def __init__(self, initial_length, start_step, end_step):
      """Build a ExpandingSliding object.
  
      Parameters
      ----------
      initial_length: int, Initial length of the input window.
      start_step: int, Initial step size.
      end_step: int, Final step size.
      """
      super().__init__()
      self.initial_length = initial_length
      self.start_step = start_step
      self.end_step = end_step
  
imports: import collections
  import numpy
label_desc: Use image node_id 1 to create a new _ExpandingSliding object from inherited base classes: _Window with example: obj = _ExpandingSliding(initial_length, start_step, end_step)