code: def enhance_edges_log(image, mask=None, sigma=2.0):
      size = int(sigma * 4) + 1
      output_pixels = centrosome.filter.laplacian_of_gaussian(
          image, mask, size, sigma
      )
      return output_pixels
  
imports: import numpy
  import skimage.color
  import skimage.morphology
  import centrosome
  import centrosome.threshold
  import scipy
  import matplotlib
label_desc: Use image node_id 4 for calling a global function with example usage: enhance_edges_log(image, mask, sigma) and returns: output_pixels