/**
* @param float $a
* @param float $b
*
* @return float
*/
public function compute($a, $b)
{
$score = 2 * Product::scalar($a, $b);
$squares = Product::scalar($a, $a) + Product::scalar($b, $b);
$result = exp(-$this->gamma * ($squares - $score));
return $result;
}
public function testScalarProduct()
{
$this->assertEquals(10, Product::scalar([2, 3], [-1, 4]));
$this->assertEquals(-0.1, Product::scalar([1, 4, 1], [-2, 0.5, -0.1]));
$this->assertEquals(8, Product::scalar([2], [4]));
//test for non numeric values
$this->assertEquals(0, Product::scalar(['', null, [], new \stdClass()], [null]));
}
