What Helps Transformers Recognize Conversational Structure? Importance of Context, Punctuation, and Labels in Dialog Act Recognition Piotr Żelasko author Raghavendra Pappagari author Najim Dehak author 2021 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal zelasko-etal-2021-helps 10.1162/tacl_a_00420 https://aclanthology.org/2021.tacl-1.69/ 2021 9 1163 1179