However, approaches including word and n-gram features also performed well (Bär et al., 2012; Sarić et al., 2012), and the 2013 STS task focused more on predicting similarity for text pairs from new domains.
for the three variations of our system that we were allowed to submit, we used stacking (Wolpert, 1992) to combine PERP with word and ngram features and applied the domain adaptation approach outlined by Daume III (2007) to facilitate generalization to new domains.