code: def test_one_sided_y_greater_x():
      p = permutation_test(
          treatment, control, func=lambda x, y: np.mean(y) - np.mean(x)
      )
      assert round(p, 3) == 0.973, p
  
      p = permutation_test(treatment, control, func="x_mean < y_mean")
      assert round(p, 3) == 0.973, p
  
file_path: mlxtend/mlxtend/evaluate/tests/test_permutation.py
imports: import numpy
  from mlxtend.evaluate import permutation_test
  from mlxtend.utils import assert_raises
label_desc: Use image node_id 2 for calling a global function with example usage: test_one_sided_y_greater_x() without return types