code: def test_gaussian_filter():
      from scipy import ndimage
  
      f = luispedro_jpg(1)
      for s in (4.0, 8.0, 12.0):
          g = gaussian_filter(f, s)
          n = ndimage.gaussian_filter(f, s)
          assert np.max(np.abs(n - g)) < 1.0e-5
  
imports: import numpy
  import mahotas
  import mahotas.convolve
  import mahotas
  from mahotas.convolve import convolve1d, gaussian_filter
  import mahotas._filters
  from mahotas.tests.utils import luispedro_jpg
  import pytest
label_desc: Use image node_id 6 for calling a global function with example usage: test_gaussian_filter() without return types