Using Subtext to Enhance Generative IDRR

Implicit Discourse Relation Recognition (abbr., IDRR) is a NLP task of classifying argument pairs into different types of semantic relations.Arguments contain subtexts, some of which are beneficial to the perception of semantic relations.However, subtexts are connotative.The neural IDRR model fails to be aware of them without being given pertinent prompts.In this paper, we leverage LLaMA to generate subtexts for argument pairs, and verify the effectiveness of subtext-based IDRR.We construct an IDRR baseline using the decoderonly backbone LLaMA, and enhance it with subtext-aware relation reasoning.A confidencediagnosed dual-channel network is used for collaboration between in-subtext and out-ofsubtext IDRR.We experiment on PDTB-2.0 and PDTB-3.0 for both the main-level and secondary-level relation taxonomies.The test results show that our approach yields substantial improvements compared to the baseline, and achieves higher F 1-scores on both benchmarks than the previous decoder-only IDRR models.We make the source codes and data publicly available.