code: def mean_blue_relative_intensity(
      batch: List[np.ndarray],
  ) -> List[float]:
      """Return the mean of the blue channel relative intensity."""
      return [x[2] for x in _rgb_relative_intensity_mean(batch)]
  
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 7 for calling a global function with example usage: mean_blue_relative_intensity(batch) and returns: unknown