code: def test_piecewise_affine():
      tform = PiecewiseAffineTransform()
      assert tform.estimate(SRC, DST)
      # make sure each single affine transform is exactly estimated
      assert_almost_equal(tform(SRC), DST)
      assert_almost_equal(tform.inverse(DST), SRC)
  
imports: import re
  import textwrap
  import numpy
  import pytest
  from numpy.testing import assert_almost_equal, assert_array_almost_equal, assert_equal
  from skimage.transform import AffineTransform, EssentialMatrixTransform, EuclideanTransform, FundamentalMatrixTransform, PiecewiseAffineTransform, PolynomialTransform, ProjectiveTransform, SimilarityTransform, estimate_transform, matrix_transform
  from skimage.transform._geometric import _GeometricTransform, _affine_matrix_from_vector, _center_and_normalize_points, _euler_rotation_matrix
label_desc: Use image node_id 12 for calling a global function with example usage: test_piecewise_affine() without return types