/**
* @depends testOffsetSetOffsetGet
*/
function testHashNull()
{
$map = new HashMap();
$map->offsetSet(null, 1);
$this->assertEquals(1, $map->offsetGet(null));
}
public function generateRulesBruteForce($largeItemSets, $metricThreshold, $upperBoundMinSuppAsInstances, $lowerBoundMinSuppAsInstances, $totalTransactions)
{
$rules = array();
// new ArrayList<AssociationRule>();
$largeItemSets->sort();
$frequencyLookup = new HashMap();
// new HashMap<Collection<BinaryItem>, Integer>();
$frequentBinaryItemset = $largeItemSets->getSet();
// process each large item set
foreach ($frequentBinaryItemset as $fis) {
$frequencyLookup->offsetSet($fis->getItems(), $fis->getSupport());
if (count($fis->getItems()) > 1) {
// generate all the possible subsets for the premise
$subset = array_fill(0, count($fis->getItems()), false);
//array[fis.getItems().size()];
$premise = null;
$consequence = null;
while (!is_null($premise = $this->getPremise($fis, $subset))) {
if (count($premise) > 0 && count($premise) < count($fis->getItems())) {
$consequence = $this->getConsequence($fis, $subset);
$totalSupport = $fis->getSupport();
$supportPremise = $frequencyLookup->offsetGet($premise);
$supportConsequence = $frequencyLookup->offsetGet($consequence);
// a candidate rule
$candidate = new DefaultAssociationRule($premise, $consequence, $supportPremise, $supportConsequence, $totalSupport, $totalTransactions);
if ($candidate->getPrimaryMetricValue() > $metricThreshold && $candidate->getTotalSupport() >= $lowerBoundMinSuppAsInstances && $candidate->getTotalSupport() <= $upperBoundMinSuppAsInstances) {
// accept this rule
$rules[] = $candidate;
}
}
$this->nextSubset($subset);
}
}
}
return $rules;
}
