$LS \cup KLD \cup CONN$ and $KLD \cup LS \cup LS_{inter}$ are the best systems with the highest recall and F1-score respectively. 
 Question: What was previous state-of-the-art approach?
TextCNN, TextRNN, SASE, DPCNN, and BERT $LS \cup KLD \cup CONN$ and $KLD \cup LS \cup LS_{inter}$ are the best systems with the highest recall and F1-score respectively