code: def _hue(tens: Tensor) -> Tensor:
      return _hls(tens)[:, :, 0]
  
imports: import cv2
  import random
  import math
  import numpy
  from ..coreten import Tensor, to_tensor
  from ..annotations import Tuple, Union
  from ..color import to_hls, to_rgb, to_bgr, to_hsv, to_gray, to_lab
label_desc: Use image node_id 4 for calling a global function with example usage: _hue(tens) and returns: _hls