public function testComputeSimilarity2()
{
$instance = new KNNModelBuilder(null, new CosineSimilarity());
$source = new ObjectSet(Rating::class);
$destination = new ObjectSet(Rating::class);
$node1 = new FakeNode(1);
$node2 = new FakeNode(2);
$node3 = new FakeNode(3);
$node4 = new FakeNode(4);
$node5 = new FakeNode(5);
$source->add(new Rating(1, $node1->identity()));
$source->add(new Rating(3, $node4->identity()));
$destination->add(new Rating(1, $node2->identity()));
$destination->add(new Rating(2, $node4->identity()));
$destination->add(new Rating(5, $node5->identity()));
$similarity = $instance->computeSimilarity($source, $destination);
$this->assertTrue($similarity >= 0.34641016 && $similarity <= 0.346410161514);
}
public function createVectors(ObjectSet $tfSource, ObjectSet $tfDestination)
{
$ratings = [];
foreach ($tfSource->getAll() as $source) {
/** @var \GraphAware\Reco4PHP\Algorithms\Model\Rating $source */
$ratings[$source->getId()][0] = $source->getRating();
}
foreach ($tfDestination->getAll() as $dest) {
/** @var \GraphAware\Reco4PHP\Algorithms\Model\Rating $dest */
$ratings[$dest->getId()][1] = $dest->getRating();
}
ksort($ratings);
$xVector = [];
$yVector = [];
foreach ($ratings as $k => $rating) {
$xVector[] = array_key_exists(0, $ratings[$k]) ? $ratings[$k][0] : 0;
$yVector[] = array_key_exists(1, $ratings[$k]) ? $ratings[$k][1] : 0;
}
return array($xVector, $yVector);
}
/**
* @param \GraphAware\Common\Type\NodeInterface $node
*/
public function add(NodeInterface $node)
{
if (parent::valid($node) && !$this->contains($node)) {
$this->elements[$node->identity()] = $node;
}
}
$stopwatch->start("e");
$result = $driver->run($qA);
$e = $stopwatch->stop("e");
echo $e->getDuration() . PHP_EOL;
$stopwatch->start("simil");
$pairs = [];
$crs = array_chunk($result->records(), 100);
foreach ($result->records() as $record) {
$source = new ObjectSet(Rating::class);
$m = $record->value("m");
foreach ($record->value("ratings") as $rating) {
$source->add(new Rating($rating['rating'], $rating['user']));
}
foreach ($crs as $cr) {
foreach ($cr as $record2) {
$m2 = $record2->value("m");
$k = $m + $m2;
if (!array_key_exists($k, $pairs) && $record2->value("m") !== $record->value("m")) {
$destination = new ObjectSet(Rating::class);
foreach ($record2->value("ratings") as $rating2) {
$destination->add(new Rating($rating2['rating'], $rating2['user']));
}
$simil = $knn->computeSimilarity($source, $destination);
$pairs[$k] = ['source' => $record->value("m"), 'desc' => $record2->value("m"), 'similarity' => $simil];
//echo $simil . PHP_EOL;
}
}
}
}
$e2 = $stopwatch->stop("simil");
echo $e2->getDuration() . PHP_EOL;
