features.add(new ThresholdFeature(10));
cv.multiValidate(features, trainer, 10, data, null, 0);
print("Stopword");
features.clear();
features.add(new StopwordFeature(0));
cv.multiValidate(features, trainer, 10, data, null, 0);
print("Stopword threshold 10");
features.clear();
features.add(new StopwordFeature(10));
cv.multiValidate(features, trainer, 10, data, null, 0);
print("Lemma");
features.clear();
features.add(new LemmaFeature(0));