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import unittest
import numpy as np
from Orange.evaluation import MAPE
from Orange.evaluation.scoring import SMAPE
class TestScoring(unittest.TestCase):
def test_mape(self):
f = MAPE.__wraps__
exp = np.array([100, -200, 300, 60])
pred = np.array([110, -180, 340, 60])
self.assertEqual(f(exp, pred), (10 / 100 + 20 / 200 + 40 / 300) / 4 * 100)
exp = np.array([0, 200, 300])
self.assertEqual(f(exp, pred), np.inf)
def test_smape(self):
f = SMAPE.__wraps__
exp = np.array([100, -200, 300, 60, 80])
pred = np.array([110, -180, -340, 60, 50])
self.assertEqual(
f(exp, pred),
2 * (10 / 210 + 20 / 380 + 640 / 640 + 0 / 120 + 30 / 130) / 5 * 100)
exp = np.array([0, -200, 300, 60, 80])
self.assertEqual(
f(exp, pred),
2 * (110 / 110 + 20 / 380 + 640 / 640 + 0 / 120 + 30 / 130) / 5 * 100)
if __name__ == '__main__':
unittest.main()
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