Challenge: Existing studies have failed to scale up the pre-training process by putting aside unlabeled data . et al., 2019: multi-party dialogues are more difficult for models to understand since they involve multiple interlocutors resulting in interweaving reply-to relations and information flows.
Approach: They propose to treat discourse structures as latent variables and jointly infer them to pre-train a model that understands the discourse structure of multi-party dialogues.
Outcome: The proposed model outperforms baselines and achieves state-of-the-art results on multiple downstream tasks.

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Challenge: Existing approaches to pretrain large language models for dialogue response generation are difficult due to the lack of annotated addressee labels in multi-party dialogue datasets.
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Challenge: Discourse parsing on multi-party dialogues is an important but difficult task in dialogue systems and conversational analysis.
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MPC-BERT: A Pre-Trained Language Model for Multi-Party Conversation Understanding (2021.acl-long)

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Challenge: Existing models for multi-party conversation represent interlocutors and utterances individually . existing methods ignore complicated structure of MPC which may provide crucial interlocutor and tertiary semantics.
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Bazinga! A Dataset for Multi-Party Dialogues Structuring (2022.lrec-1)

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Challenge: a dataset of 16 TV and movie series is filled with challenging multi-party dialogues.
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Discourse Structure Extraction from Pre-Trained and Fine-Tuned Language Models in Dialogues (2023.findings-eacl)

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Challenge: Discourse processing suffers from data sparsity, especially for dialogues . a variety of discourse frameworks have been proposed to extract discourse information from dialogues.
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Towards Efficient Dialogue Pre-training with Transferable and Interpretable Latent Structure (2022.emnlp-main)

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Challenge: Existing models that use millions of parameters on massive data are inefficient and lack interpretability.
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DraDDP: A Multimodal Multi-Party Dialogue Discourse Parsing Dataset (2026.findings-acl)

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Challenge: Existing studies on multi-party dialogue discourse parsing focus on textual modality and two-party dialog . et al., 2016) focused on text-based discourse parses, ignoring the complexity and richness of multimodal interactions in real-world scenarios.
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In Search of the Lost Arch in Dialogue: A Dependency Dialogue Acts Corpus for Multi-Party Dialogues (2025.findings-acl)

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Challenge: Understanding speaker intentions remains a challenge in NLP . a number of corpora annotated using theoretical frameworks of dialogue focus on utterance-level labeling of speaker intent, missing wider context, or the rhetorical structure of a dialogue.
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PLATO: Pre-trained Dialogue Generation Model with Discrete Latent Variable (2020.acl-main)

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Challenge: Existing pre-training models for dialogue generation have been proven effective for a wide range of tasks.
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Pretrained Language Models for Dialogue Generation with Multiple Input Sources (2020.findings-emnlp)

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Challenge: Large-scale pretrained language models have achieved outstanding performance on natural language understanding tasks.
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