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Reinforcement Learning (RL) is a powerful framework to address the discrepancy between loss functions used during training and the final evaluation metrics to be used at test time. When applied to neural Machine Translation (MT), it…

Computation and Language · Computer Science 2021-02-24 Julia Ive , Zixu Wang , Marina Fomicheva , Lucia Specia

Large Language Models (LLMs) have significantly enhanced conversational Artificial Intelligence(AI) chatbots; however, domain-specific accuracy and the avoidance of factual inconsistencies remain pressing challenges, particularly for large…

Information Retrieval · Computer Science 2025-09-24 Olalekan K. Akindele , Bhupesh Kumar Mishra , Kenneth Y. Wertheim

Generating qualitative responses has always been a challenge for human-computer dialogue systems. Existing dialogue systems generally derive from either retrieval-based or generative-based approaches, both of which have their own pros and…

Computation and Language · Computer Science 2020-05-01 Jiayi Zhang , Chongyang Tao , Zhenjing Xu , Qiaojing Xie , Wei Chen , Rui Yan

Automatic evaluation of retrieval augmented generation (RAG) systems relies on fine-grained dimensions like faithfulness and relevance, as judged by expert human annotators. Meta-evaluation benchmarks support the development of automatic…

Computation and Language · Computer Science 2025-07-22 María Andrea Cruz Blandón , Jayasimha Talur , Bruno Charron , Dong Liu , Saab Mansour , Marcello Federico

Adapting a single agent to a new multi-agent system brings challenges, necessitating adjustments across various tasks, environments, and interactions with unknown teammates and opponents. Addressing this challenge is highly complex, and…

Multiagent Systems · Computer Science 2025-06-23 Chenxu Wang , Yonggang Jin , Cheng Hu , Youpeng Zhao , Zipeng Dai , Jian Zhao , Shiyu Huang , Liuyu Xiang , Junge Zhang , Zhaofeng He

Despite significant advancements in Large Language Models (LLMs) and Large Vision-Language Models (LVLMs), current models still face substantial challenges in handling complex, multi-turn, and visually-grounded tasks that demand deep…

Computation and Language · Computer Science 2025-08-22 Seungmin Han , Haeun Kwon , Ji-jun Park , Taeyang Yoon

Retrieval-Augmented Generation (RAG) systems rely critically on the retriever module to surface relevant context for large language models. Although numerous retrievers have recently been proposed, each built on different ranking principles…

Information Retrieval · Computer Science 2026-02-26 Wenqing Zheng , Dmitri Kalaev , Noah Fatsi , Daniel Barcklow , Owen Reinert , Igor Melnyk , Senthil Kumar , C. Bayan Bruss

Multimodal Retrieval-Augmented Generation (MRAG) enhances large language models (LLMs) by integrating multimodal data (text, images, videos) into retrieval and generation processes, overcoming the limitations of text-only…

Information Retrieval · Computer Science 2025-04-15 Lang Mei , Siyu Mo , Zhihan Yang , Chong Chen

The Retrieval-Augmented Generation (RAG) framework introduces a retrieval module to dynamically inject retrieved information into the input context of large language models (LLMs), and has demonstrated significant success in various NLP…

Information Retrieval · Computer Science 2025-05-27 Yi Jiang , Sendong Zhao , Jianbo Li , Haochun Wang , Bing Qin

Retrieval-Augmented Generation (RAG) systems traditionally treat retrieval and generation as separate processes, requiring explicit textual queries to connect them. This separation can limit the ability of models to generalize across…

Computation and Language · Computer Science 2025-09-19 Wenzheng Zhang , Xi Victoria Lin , Karl Stratos , Wen-tau Yih , Mingda Chen

Intelligent personal assistant systems that are able to have multi-turn conversations with human users are becoming increasingly popular. Most previous research has been focused on using either retrieval-based or generation-based methods to…

Information Retrieval · Computer Science 2019-08-27 Liu Yang , Junjie Hu , Minghui Qiu , Chen Qu , Jianfeng Gao , W. Bruce Croft , Xiaodong Liu , Yelong Shen , Jingjing Liu

We present the Conversational Data Retrieval (CDR) benchmark, the first comprehensive test set for evaluating systems that retrieve conversation data for product insights. With 1.6k queries across five analytical tasks and 9.1k…

Computation and Language · Computer Science 2026-02-17 Yohan Lee , Yongwoo Song , Sangyeop Kim

Evaluating the quality of a dialogue interaction between two agents is a difficult task, especially in open-domain chit-chat style dialogue. There have been recent efforts to develop automatic dialogue evaluation metrics, but most of them…

Computation and Language · Computer Science 2020-05-05 Koustuv Sinha , Prasanna Parthasarathi , Jasmine Wang , Ryan Lowe , William L. Hamilton , Joelle Pineau

Neural Machine Translation (NMT) systems are typically evaluated using automated metrics that assess the agreement between generated translations and ground truth candidates. To improve systems with respect to these metrics, NLP researchers…

Computation and Language · Computer Science 2020-11-30 Nicholas Roberts , Davis Liang , Graham Neubig , Zachary C. Lipton

Multi-modal recommendation (MMR) enriches item representations by introducing item content, e.g., visual and textual descriptions, to improve upon interaction-only recommenders. The success of MMR hinges on aligning these content modalities…

Information Retrieval · Computer Science 2026-04-06 Jing Du , Zesheng Ye , Congbo Ma , Feng Liu , Flora. D. Salim

Speech enhancement techniques improve the quality or the intelligibility of an audio signal by removing unwanted noise. It is used as preprocessing in numerous applications such as speech recognition, hearing aids, broadcasting and…

Audio and Speech Processing · Electrical Eng. & Systems 2023-06-05 Angélica S. Z. Suárez , Clément Laroche , Line H. Clemmensen , Sneha Das

Large Language Models (LLMs) are becoming essential tools for various natural language processing tasks but often suffer from generating outdated or incorrect information. Retrieval-Augmented Generation (RAG) addresses this issue by…

While Group Relative Policy Optimization (GRPO) offers a powerful framework for LLM post-training, its effectiveness in open-ended domains like Machine Translation hinges on accurate intra-group ranking. We identify that standard Scalar…

Computation and Language · Computer Science 2026-02-17 Sen Yang , Shanbo Cheng , Lu Xu , Jianbing Zhang , Shujian Huang

The application of large language models (LLMs) in recommendation systems has recently gained traction. Traditional recommendation systems often lack explainability and suffer from issues such as popularity bias. Previous research has also…

Information Retrieval · Computer Science 2025-12-04 Yaqi Wang , Haojia Sun , Shuting Zhang

Automatic evaluation is an integral aspect of dialogue system research. The traditional reference-based NLG metrics are generally found to be unsuitable for dialogue assessment. Consequently, recent studies have suggested various unique,…

Computation and Language · Computer Science 2024-01-23 Chen Zhang , Luis Fernando D'Haro , Yiming Chen , Malu Zhang , Haizhou Li
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