def test_calculation_divide_by_zeros(self):
"""PCR: P/R/F calculations correctly handle divide-by-zero errors"""
# Divide by zero handled correctly
pcr = PerformanceCalculatorResult(0,0,0,None)
self.assertEqual(pcr._calculate_precision(),None)
self.assertEqual(pcr._calculate_recall(),None)
self.assertEqual(pcr._calculate_f_measure(),None)
def test_calculation_divide_by_zeros(self):
"""PCR: P/R/F calculations correctly handle divide-by-zero errors"""
# Divide by zero handled correctly
pcr = PerformanceCalculatorResult(0, 0, 0, None)
self.assertEqual(pcr._calculate_precision(), None)
self.assertEqual(pcr._calculate_recall(), None)
self.assertEqual(pcr._calculate_f_measure(), None)
def test_calculate_recall(self):
"""PCR: recall calculations function as expected """
# Max and min tests
pcr = PerformanceCalculatorResult(50,0,0,None)
self.assertAlmostEqual(pcr._calculate_recall(),1.000,3)
pcr = PerformanceCalculatorResult(0,0,50,None)
self.assertAlmostEqual(pcr._calculate_recall(),0.000,3)
# Intermediate tests
pcr = PerformanceCalculatorResult(42,0,1,None)
self.assertAlmostEqual(pcr._calculate_recall(),0.9767,3)
pcr = PerformanceCalculatorResult(1,0,42,None)
self.assertAlmostEqual(pcr._calculate_recall(),0.0232,3)
pcr = PerformanceCalculatorResult(42,0,42,None)
self.assertAlmostEqual(pcr._calculate_recall(),0.500,3)
pcr = PerformanceCalculatorResult(42,0,126,None)
self.assertAlmostEqual(pcr._calculate_recall(),0.250,3)
pcr = PerformanceCalculatorResult(126,0,42,None)
self.assertAlmostEqual(pcr._calculate_recall(),0.750,3)
# FP/TN have no effect
pcr = PerformanceCalculatorResult(126,20,42,None)
self.assertAlmostEqual(pcr._calculate_recall(),0.750,3)
pcr = PerformanceCalculatorResult(126,20,42,50)
self.assertAlmostEqual(pcr._calculate_recall(),0.750,3)
def test_calculate_recall(self):
"""PCR: recall calculations function as expected """
# Max and min tests
pcr = PerformanceCalculatorResult(50, 0, 0, None)
self.assertAlmostEqual(pcr._calculate_recall(), 1.000, 3)
pcr = PerformanceCalculatorResult(0, 0, 50, None)
self.assertAlmostEqual(pcr._calculate_recall(), 0.000, 3)
# Intermediate tests
pcr = PerformanceCalculatorResult(42, 0, 1, None)
self.assertAlmostEqual(pcr._calculate_recall(), 0.9767, 3)
pcr = PerformanceCalculatorResult(1, 0, 42, None)
self.assertAlmostEqual(pcr._calculate_recall(), 0.0232, 3)
pcr = PerformanceCalculatorResult(42, 0, 42, None)
self.assertAlmostEqual(pcr._calculate_recall(), 0.500, 3)
pcr = PerformanceCalculatorResult(42, 0, 126, None)
self.assertAlmostEqual(pcr._calculate_recall(), 0.250, 3)
pcr = PerformanceCalculatorResult(126, 0, 42, None)
self.assertAlmostEqual(pcr._calculate_recall(), 0.750, 3)
# FP/TN have no effect
pcr = PerformanceCalculatorResult(126, 20, 42, None)
self.assertAlmostEqual(pcr._calculate_recall(), 0.750, 3)
pcr = PerformanceCalculatorResult(126, 20, 42, 50)
self.assertAlmostEqual(pcr._calculate_recall(), 0.750, 3)
