We consider three tasks representing a broad selection of natural language understanding scenarios: paper acceptance prediction based on the PeerRead data set BIBREF2, Named Entity Recognition (NER) based on the Broad Twitter Corpus BIBREF3, and author stance prediction based on the RumEval-19 data set BIBREF6.  
 Question: What are three challenging tasks authors evaluated their sequentially aligned representations?
paper acceptance prediction Named Entity Recognition (NER) author stance prediction