code: def test_correlation(self):
      result = graycomatrix(
          self.image, [1, 2], [0], 4, normed=True, symmetric=True
      )
      energy = graycoprops(result, "correlation")
      np.testing.assert_almost_equal(energy[0, 0], 0.71953255)
      np.testing.assert_almost_equal(energy[1, 0], 0.41176470)
  
imports: import numpy
  import pytest
  from skimage._shared.testing import expected_warnings, run_in_parallel
  from skimage.feature import graycomatrix, graycoprops, local_binary_pattern, multiblock_lbp
  from skimage.transform import integral_image
label_desc: Use image node_id 20 for calling the TestGLCM obj's underlying member method code with example usage: obj.test_correlation() without return types