code: def _is_grayscale(img):
      return get_dimension(img) == 1
  
imports: from typing import Dict, List, Tuple
  import numpy
  from cv2 import CV_64F, Laplacian
  from skimage.color import rgb2gray
label_desc: Use image node_id 14 for calling a global function with example usage: _is_grayscale(img) and returns: unknown