code: def test_two_sided():
      p = permutation_test(
          treatment,
          control,
          func=lambda x, y: np.abs(np.mean(x) - np.mean(y)),
      )
      assert round(p, 3) == 0.060, p
  
      p = permutation_test(treatment, control, func="x_mean != y_mean")
      assert round(p, 3) == 0.060, 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 3 for calling a global function with example usage: test_two_sided() without return types