code: def test_wape():
      """[Metrics] mape."""
      z = metrics.wape(y, p)
      np.testing.assert_equal(np.array(z), np.array(3.7))
  
imports: import numpy
  from mlens import metrics
label_desc: Use image node_id 3 for calling a global function with example usage: test_wape() without return types