code: def _is_yuv_image(tens):
      return len(tens.shape) == 3 and tens.shape[-1] == 3
  
file_path: caer/caer/color/_yuv.py
imports: import cv2
  from ..coreten import Tensor, to_tensor
  from ._constants import YUV2BGR, YUV2RGB
  from ._bgr import bgr2gray, bgr2hls, bgr2hsv, bgr2lab, bgr2luv
label_desc: Use image node_id 1 for calling a global function with example usage: _is_yuv_image(tens) and returns: unknown