code: def test_ellipse_parameter_stability():
      """The fit should be modified so that a > b"""
  
      for angle in np.arange(0, 180 + 1, 1):
          # generate rotation matrix
          theta = np.deg2rad(angle)
          c = np.cos(theta)
          s = np.sin(theta)
          R = np.array([[c, -s], [s, c]])
  
          # generate points on ellipse
          t = np.linspace(0, 2 * np.pi, 20)
          a = 100
          b = 50
          points = np.array([a * np.cos(t), b * np.sin(t)])
          points = R @ points
  
          # fit model to points
          ellipse_model = EllipseModel()
          ellipse_model.estimate(points.T)
          _, _, a_prime, b_prime, theta_prime = ellipse_model.params
  
          assert_almost_equal(theta_prime, theta)
          assert_almost_equal(a_prime, a)
          assert_almost_equal(b_prime, b)
  
imports: import numpy
  import pytest
  from skimage._shared import testing
  from skimage._shared._warnings import expected_warnings
  from skimage._shared.testing import arch32, assert_almost_equal, assert_array_less, assert_equal, xfail
  from skimage.measure import CircleModel, EllipseModel, LineModelND, ransac
  from skimage.measure.fit import _dynamic_max_trials
  from skimage.transform import AffineTransform
label_desc: Use image node_id 16 for calling a global function with example usage: test_ellipse_parameter_stability() without return types