fold Partial - out of Memory - WordCountVectorizer

[dazzafact]

Hello!
How can i split the training Code correctly using "partial",
My modified code does not work with partial parts.

Fatal error: Out of memory (allocated 31283216384)......WordCountVectorizer.php on line 247

$words=12000;//2000 worked without spliting
$min=0.0005;
$max=1;
$x=0;
$trainParts=35;
.....
$descs = new Labeled($descs, $labels);
....
$transformer_2 = new WordCountVectorizer($words,$min, $max, new NGram(1, 2));
....
$descs->apply($transformer_2);
$json_data = new Labeled($json_data, $labels);
....
$folds = $pointHitsArr->fold($trainParts);

$estimator = new PersistentModel(new GaussianNB(),new Filesystem('NaiveBayes.rbx', true));
$estimator->train($folds[$x]);$x++;

while($x<$trainParts){
$estimator->partial($folds[$x]);
$x++;
}