docstr: image to test thinning with
docstr_tok: ["image","to","test","thinning","with"]
code: def input_image(self):
      """image to test thinning with"""
      ii = np.array(
          [
              [0, 0, 0, 0, 0, 0, 0],
              [0, 1, 2, 3, 4, 5, 0],
              [0, 1, 0, 1, 1, 1, 0],
              [0, 1, 1, 1, 1, 1, 0],
              [0, 6, 1, 1, 1, 1, 0],
              [0, 1, 1, 1, 1, 1, 0],
              [0, 0, 0, 0, 0, 0, 0],
          ],
          dtype=float,
      )
      return ii
  
imports: import numpy
  import pytest
  from numpy.testing import assert_array_equal
  from scipy.ndimage import correlate
  from skimage import draw
  from skimage._shared.testing import fetch
  from skimage.io import imread
  from skimage.morphology import medial_axis, skeletonize, thin
  from skimage.morphology._skeletonize import G123_LUT, G123P_LUT, _generate_thin_luts
label_desc: Use image node_id 1 for calling the TestThin obj's underlying member method code with example usage: obj.input_image() and returns: ii