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Add calculating the lift of the rules #29

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Add calculating the lift of the rules #29

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7 changes: 4 additions & 3 deletions apriori.py
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Original file line number Diff line number Diff line change
Expand Up @@ -107,9 +107,10 @@ def getSupport(item):
remain = item.difference(element)
if len(remain) > 0:
confidence = getSupport(item)/getSupport(element)
lift = getSupport(item)/(getSupport(element)*getSupport(remain))
if confidence >= minConfidence:
toRetRules.append(((tuple(element), tuple(remain)),
confidence))
confidence,lift))
return toRetItems, toRetRules


Expand All @@ -118,9 +119,9 @@ def printResults(items, rules):
for item, support in sorted(items, key=lambda (item, support): support):
print "item: %s , %.3f" % (str(item), support)
print "\n------------------------ RULES:"
for rule, confidence in sorted(rules, key=lambda (rule, confidence): confidence):
for rule, confidence, lift in sorted(rules, key=lambda (rule, confidence, lift): confidence):
pre, post = rule
print "Rule: %s ==> %s , %.3f" % (str(pre), str(post), confidence)
print "Rule: %s ==> %s , %.3f, %.3f" % (str(pre), str(post), confidence, lift)


def dataFromFile(fname):
Expand Down
12 changes: 6 additions & 6 deletions test_apriori.py
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Original file line number Diff line number Diff line change
Expand Up @@ -171,17 +171,17 @@ def test_print_results_should_have_results_in_defined_format(self):
(('beer', 'rice'), 0.5)
]
rules = [
((('beer',), ('rice',)), 0.6666666666666666),
((('rice',), ('beer',)), 1.0)
((('beer',), ('rice',)), 0.6666666666666666, 1.3333333333333333),
((('rice',), ('beer',)), 1.0, 1.3333333333333333)
]
printResults(items, rules)

expected = "item: ('milk',) , 0.500\nitem: ('apple',) , "
expected += "0.500\nitem: ('rice',) , 0.500\nitem: ('beer', "
expected += "'rice') , 0.500\nitem: ('beer',) , 0.750\n\n"
expected += "------------------------ RULES:\nRule: ('beer',) "
expected += "==> ('rice',) , 0.667\nRule: ('rice',) ==> "
expected += "('beer',) , 1.000\n"
expected += "==> ('rice',) , 0.667, 1.333\nRule: ('rice',) ==> "
expected += "('beer',) , 1.000, 1.333\n"
self.assertEqual(fake_output.getvalue(), expected)

def test_run_apriori_should_get_items_and_rules(self):
Expand Down Expand Up @@ -211,8 +211,8 @@ def test_run_apriori_should_get_items_and_rules(self):
self.assertEqual(items, expected)

expected = [
((('beer',), ('rice',)), 0.6666666666666666),
((('rice',), ('beer',)), 1.0)
((('beer',), ('rice',)), 0.6666666666666666, 1.3333333333333333),
((('rice',), ('beer',)), 1.0, 1.3333333333333333)
]
self.assertEqual(rules, expected)

Expand Down