sentence1: semi-supervised learning ( ssl ) is the use of small amounts of labeled data with relatively large amounts of unlabeled data to train predictors .
sentence2: semi-supervised learning ( ssl ) is a machine learning ( ml ) approach that utilizes large amounts of unlabeled data , combined with a smaller amount of labeled data , to learn a target function ( cite-p-23-1-15 , cite-p-23-1-2 ) .