|
public getObservation ( integer $index ) : |
||
| $index | integer | |
| Résultat | ||
/**
* @param Observations $observations
* @param array $coefficients
* @return array
*/
protected function calculateGradient(Observations $observations, array $coefficients) : array
{
$gradient = array_fill(0, count($observations->getObservation(0)->getFeatures()), 0.0);
$batchElementIndices = (array) array_rand(range(0, count($observations) - 1), $this->batchSize);
foreach ($batchElementIndices as $index) {
$observation = $observations->getObservation($index);
$observationGradient = $this->gradient->gradient($coefficients, $observation->getFeatures(), $observation->getOutcome());
foreach ($observationGradient as $i => $observationSlope) {
$gradient[$i] += $observationSlope / $this->batchSize;
}
}
return $gradient;
}
/**
* @param Observations $observations
* @param array $coefficients
* @return array
*/
protected function calculateGradient(Observations $observations, array $coefficients) : array
{
$observation = $observations->getObservation(mt_rand(0, count($observations) - 1));
return $this->gradient->gradient($coefficients, $observation->getFeatures(), $observation->getOutcome());
}
/**
* @param Observations $observations
* @param array $coefficients
* @return array
*/
protected function calculateGradient(Observations $observations, array $coefficients) : array
{
$gradient = array_fill(0, count($observations->getObservation(0)->getFeatures()), 0.0);
$batchSize = count($observations);
/** @var Observation $observation */
foreach ($observations as $observation) {
$observationGradient = $this->gradient->gradient($coefficients, $observation->getFeatures(), $observation->getOutcome());
foreach ($observationGradient as $i => $observationSlope) {
$gradient[$i] += $observationSlope / $batchSize;
}
}
return $gradient;
}
