public function step(int $featureIndex) : float { return $this->stepSize / sqrt($this->eta + $this->history[$featureIndex]); }
public function testStep() { $schedule = new RmsProp(0.9, 0.01, 1.0E-6); $schedule->update([1.0]); static::assertEquals(0.00999999500000375, $schedule->step(0)); }