Semantic Textual Similarity (STS) is the task of judging the similarity of two sentences on a scale from 0 to 5 (Agirre et al., 2012).
- Eneko Agirre, Daniel Cer, Mona Diab, and Aitor Gonzalez-Agirre. 2012. Semeval-2012 task 6: A pilot on semantic textual similarity. In Proceedings of SemEval.