code: def _is_lab_image(tens):
      # tens = to_tensor(tens)
      # return tens.is_lab()
      return len(tens.shape) == 3 and tens.shape[-1] == 3
  
file_path: caer/caer/color/_lab.py
imports: import cv2
  from ..coreten import Tensor, to_tensor
  from ._constants import LAB2BGR, LAB2RGB
  from ._bgr import bgr2gray, bgr2hsv, bgr2hls, bgr2yuv, bgr2luv
label_desc: Use image node_id 1 for calling a global function with example usage: _is_lab_image(tens) and returns: unknown