To evaluate the proposed model, we conduct experiments on two common datasets for lexical simplification: BenchLS (Paetzold and Specia, 2016b) , which contains 929 instances, and NNSEval (Paetzold and Specia, 2016a) , which contains 239 instances. Each instance is composed of a sentence, a target word, and a set of gold candidates ranked by simplicity <cite>(Paetzold and Specia, 2017)</cite> .