code: def evaluate(window, height, width, boundless=False):
      """Evaluates a window tuple that may contain relative index values.
  
      The height and width of the array the window targets is the context
      for evaluation.
  
      Parameters
      ----------
      window: Window or tuple of (rows, cols).
          The input window.
      height, width: int
          The number of rows or columns in the array that the window
          targets.
  
      Returns
      -------
      Window
          A new Window object with absolute index values.
      """
      if isinstance(window, Window):
          return window
      else:
          rows, cols = window
          return Window.from_slices(
              rows=rows,
              cols=cols,
              height=height,
              width=width,
              boundless=boundless,
          )
  
imports: import collections
  from collections.abc import Iterable
  import functools
  import math
  import warnings
  from affine import Affine
  import attr
  import numpy
  from rasterio.errors import WindowError, RasterioDeprecationWarning
  from rasterio.transform import rowcol, guard_transform
label_desc: Use image node_id 15 for calling a global function with example usage: evaluate(window, height, width, boundless) and returns: window, Window