Challenge: Existing methods to aid implicit discourse relation recognition (IDRR) lack explicit connectives and are difficult to implement on fine-grained IDRR.
Approach: They propose a Prompt-based Connective Prediction method that instructs large-scale pre-trained models to use knowledge relevant to discourse relation and utilizes strong correlation between connectives and discourse relation to help the model recognize implicit discourse relations.
Outcome: The proposed method surpasses the state-of-the-art model and achieves significant improvements on those fine-grained few-shot discourse relation classes.

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Prompt-based Logical Semantics Enhancement for Implicit Discourse Relation Recognition (2023.emnlp-main)

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Challenge: Existing methods for identifying discourse relations without explicit connectives are limited by the availability of annotated data.
Approach: They propose a method that injects knowledge relevant to discourse relation into pre-trained language models through prompt-based connective prediction.
Outcome: The proposed method achieves outstanding performance against the current state-of-the-art models.
ConnPrompt: Connective-cloze Prompt Learning for Implicit Discourse Relation Recognition (2022.coling-1)

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Challenge: Existing paradigms for Implicit Discourse Relation Recognition (IDRR) do not exploit linguistic evidence embedded in the pre-training process.
Approach: They propose a new paradigm to detect and classify relation sense between two text segments without an explicit connective.
Outcome: The proposed method significantly outperforms the state-of-the-art algorithms even with fewer training data.
Connective Prediction for Implicit Discourse Relation Recognition via Knowledge Distillation (2023.acl-long)

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Challenge: Existing methods for implicit discourse relation recognition (IDRR) lack connectives, which is a major challenge in discourse analysis research.
Approach: They propose a method to predict latent correlations between connectives and discourse relations using a knowledge distillation approach.
Outcome: The proposed method outperforms state-of-the-art models on coarse-grained and fine-grain discourse relations and can be transferred to explicit discourse relation recognition and achieve acceptable performance.
NCPrompt: NSP-Based Prompt Learning and Contrastive Learning for Implicit Discourse Relation Recognition (2024.findings-emnlp)

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Challenge: Recent prompt learning methods have demonstrated success in IDRR, but they fail to fully exploit critical semantic features shared among various forms of templates.
Approach: They propose an NSP-based prompt learning and contrastive learning method for IDRR that transforms the IDRR task into a next sentence prediction task.
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DiscoPrompt: Path Prediction Prompt Tuning for Implicit Discourse Relation Recognition (2023.findings-acl)

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Challenge: Existing works on implicit discourse relation recognition focus on syntax features and lack of connectives.
Approach: They propose a prompt-based path prediction method that integrates the interactive information and intrinsic senses among the hierarchy in IDRR.
Outcome: The proposed method shows significant improvement against competitive baselines.
TEPrompt: Task Enlightenment Prompt Learning for Implicit Discourse Relation Recognition (2023.findings-acl)

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Challenge: Existing prompt learning models for IDRR use multiple-prompt decisions from three different yet much similar connective prediction templates.
Approach: They propose to fuse three related tasks to fuse the learned features of auxiliary tasks to create a prompt learning model that can be used to boost the main task.
Outcome: The proposed model outperforms the ConnPrompt in the training phase and in the testing phase.
Employing the Correspondence of Relations and Connectives to Identify Implicit Discourse Relations via Label Embeddings (P19-1)

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Challenge: Existing models for implicit discourse relation recognition lack the ability to accurately map connectives into discourse relations.
Approach: They propose a multi-task learning framework where relations and connectives are simultaneously predicted and leveraged to transfer knowledge between the two prediction tasks.
Outcome: The proposed framework yields state-of-the-art performance on several settings of the Penn Discourse Treebank dataset.
Not Just Classification: Recognizing Implicit Discourse Relation on Joint Modeling of Classification and Generation (2021.emnlp-main)

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Challenge: Existing methods of implicit discourse relation recognition (IDRR) focus on three aspects: enhancing discourse units representation, enhancing semantic interaction, and joint learning with other tasks.
Approach: They propose a joint model to recognize the relation label and generate the target sentence containing the meaning of relations simultaneously.
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Implicit Sense-labeled Connective Recognition as Text Generation (2023.findings-emnlp)

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Challenge: Existing methods for identifying implicit discourse relations are limited by the number of possible categories and sense labels.
Approach: They propose a method for identifying the sense label of an implicit connective between adjacent text spans by using an encoder-decoder model.
Outcome: The proposed method outperforms the conventional classification-based method on a shallow discourse parsing dataset.
Infusing Hierarchical Guidance into Prompt Tuning: A Parameter-Efficient Framework for Multi-level Implicit Discourse Relation Recognition (2023.acl-long)

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Challenge: Multi-level implicit discourse relation recognition (MIDRR) aims at identifying hierarchical discourse relations among arguments.
Approach: They propose a prompt-based multi-level implicit discourse relation recognition framework that leverages parameter-efficient prompt tuning to drive inputted arguments to match the pre-trained space.
Outcome: The proposed framework achieves comparable results on PDTB 2.0 and 3.0 using about 0.1% trainable parameters compared with baselines.

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