Revisiting Shallow Discourse Parsing in the PDTB-3: Handling Intra-sentential Implicits

In the PDTB-3, several thousand implicit discourse relations were newly annotated textitwithin individual sentences, adding to the over 15,000 implicit relations annotated textitacross adjacent sentences in the PDTB-2. Given that the position of the arguments to these textitintra-sentential implicits is no longer as well-defined as with textitinter-sentential implicits, a discourse parser must identify both their location and their sense. That is the focus of the current work. The paper provides a comprehensive analysis of our results, showcasing model performance under different scenarios, pointing out limitations and noting future directions.