code: def test_shannon_all_unique():
      img = np.arange(64)
      res = shannon_entropy(img, base=2)
      assert_almost_equal(res, np.log(64) / np.log(2))
  
imports: import numpy
  from skimage.measure import shannon_entropy
  from skimage._shared.testing import assert_almost_equal
label_desc: Use image node_id 2 for calling a global function with example usage: test_shannon_all_unique() without return types