CompNA at SemEval-2021 Task 1: Prediction of lexical complexity analyzing heterogeneous features Giuseppe Vettigli author Antonio Sorgente author 2021-08 text Proceedings of the 15th International Workshop on Semantic Evaluation (SemEval-2021) Alexis Palmer editor Nathan Schneider editor Natalie Schluter editor Guy Emerson editor Aurelie Herbelot editor Xiaodan Zhu editor Association for Computational Linguistics Online conference publication vettigli-sorgente-2021-compna 10.18653/v1/2021.semeval-1.69 https://aclanthology.org/2021.semeval-1.69/ 2021-08 560 564