code: def watershed_line(request):
      return request.param
  
imports: import mahotas
  import numpy
  import numpy.testing
  import pytest
  import scipy.ndimage
  import skimage.color
  import skimage.feature
  import skimage.filters
  import skimage.filters.rank
  import skimage.segmentation
  import skimage.transform
  import cellprofiler_core.image
  import cellprofiler.modules.watershed
label_desc: Use image node_id 4 for calling a global function with example usage: watershed_line(request) and returns: request