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State-of-the-art large language models (LLMs) have become indispensable tools for various tasks. However, training LLMs to serve as effective assistants for humans requires careful consideration. A promising approach is reinforcement…

Existing approaches to language model alignment often treat safety as a tradeoff against helpfulness, which can lead to unacceptable responses in sensitive domains. To ensure reliable performance in such settings, we propose High-Confidence…

Machine Learning · Computer Science 2025-06-11 Yaswanth Chittepu , Blossom Metevier , Will Schwarzer , Austin Hoag , Scott Niekum , Philip S. Thomas

Learning from human feedback is a prominent technique to align the output of large language models (LLMs) with human expectations. Reinforcement learning from human feedback (RLHF) leverages human preference signals that are in the form of…

Computation and Language · Computer Science 2023-11-27 Di Jin , Shikib Mehri , Devamanyu Hazarika , Aishwarya Padmakumar , Sungjin Lee , Yang Liu , Mahdi Namazifar

Medical image captioning via vision-language models has shown promising potential for clinical diagnosis assistance. However, generating contextually relevant descriptions with accurate modality recognition remains challenging. We present…

Computer Vision and Pattern Recognition · Computer Science 2025-04-15 Yining Zhao , Ali Braytee , Mukesh Prasad

Scientific compound figures combine multiple labeled panels into a single image. However, in a PMC-scale crawl of 346,567 compound figures, 16.3% have no caption and 1.8% only have captions shorter than ten words, causing them to be…

Computer Vision and Pattern Recognition · Computer Science 2026-03-31 Jifeng Song , Arun Das , Pan Wang , Hui Ji , Kun Zhao , Yufei Huang

We propose StyleCap, a method to generate natural language descriptions of speaking styles appearing in speech. Although most of conventional techniques for para-/non-linguistic information recognition focus on the category classification…

Computation and Language · Computer Science 2023-12-29 Kazuki Yamauchi , Yusuke Ijima , Yuki Saito

Caption quality has emerged as a critical bottleneck in training high-quality text-to-image (T2I) and text-to-video (T2V) generative models. While visual language models (VLMs) are commonly deployed to generate captions from visual data,…

Computer Vision and Pattern Recognition · Computer Science 2026-03-10 Varun Ananth , Baqiao Liu , Haoran Cai

Dense image captioning is critical for cross-modal alignment in vision-language pretraining and text-to-image generation, but scaling expert-quality annotations is prohibitively expensive. While synthetic captioning via strong…

Computer Vision and Pattern Recognition · Computer Science 2026-03-11 Tzu-Heng Huang , Sirajul Salekin , Javier Movellan , Frederic Sala , Manjot Bilkhu

Automatic prompt optimization frameworks are developed to obtain suitable prompts for large language models (LLMs) with respect to desired output quality metrics. Although existing approaches can handle conventional tasks such as…

Computation and Language · Computer Science 2025-05-14 Chun-Pai Yang , Kan Zheng , Shou-De Lin

Reinforcement Learning from Human Feedback (RLHF) has emerged as a important paradigm for aligning large language models (LLMs) with human preferences during post-training. This framework typically involves two stages: first, training a…

Machine Learning · Computer Science 2025-04-08 Wenyuan Xu , Xiaochen Zuo , Chao Xin , Yu Yue , Lin Yan , Yonghui Wu

The increasing availability of image-text pairs has largely fueled the rapid advancement in vision-language foundation models. However, the vast scale of these datasets inevitably introduces significant variability in data quality, which…

Computer Vision and Pattern Recognition · Computer Science 2024-09-05 Lei Zhang , Fangxun Shu , Tianyang Liu , Sucheng Ren , Hao Jiang , Cihang Xie

This paper presents ScaleCap, an inference-time scalable image captioning strategy that generates comprehensive and detailed image captions. The key challenges of high-quality image captioning lie in the inherent biases of LVLMs: multimodal…

Computer Vision and Pattern Recognition · Computer Science 2025-06-25 Long Xing , Qidong Huang , Xiaoyi Dong , Pan Zhang , Yuhang Zang , Yuhang Cao , Jinsong Li , Shuangrui Ding , Weiming Zhang , Nenghai Yu , Jiaqi Wang , Feng Wu , Dahua Lin

Reinforcement Learning from Human Feedback (RLHF) has played a crucial role in the success of large models such as ChatGPT. RLHF is a reinforcement learning framework which combines human feedback to improve learning effectiveness and…

Machine Learning · Computer Science 2023-11-28 Feiyang Han , Yimin Wei , Zhaofeng Liu , Yanxing Qi

Data visualization captions help readers understand the purpose of a visualization and are crucial for individuals with visual impairments. The prevalence of poor figure captions and the successful application of deep learning approaches to…

Computer Vision and Pattern Recognition · Computer Science 2022-07-18 Anita Mahinpei , Zona Kostic , Chris Tanner

Image captioning has long been regarded as a fundamental task in visual understanding. Recently, however, few large vision-language model (LVLM) research discusses model's image captioning performance because of the outdated short-caption…

Computer Vision and Pattern Recognition · Computer Science 2024-07-09 Hongyuan Dong , Jiawen Li , Bohong Wu , Jiacong Wang , Yuan Zhang , Haoyuan Guo

Text-to-image diffusion models achieved a remarkable leap in capabilities over the last few years, enabling high-quality and diverse synthesis of images from a textual prompt. However, even the most advanced models often struggle to…

Computer Vision and Pattern Recognition · Computer Science 2023-10-26 Eyal Segalis , Dani Valevski , Danny Lumen , Yossi Matias , Yaniv Leviathan

While recent advances in reinforcement learning have significantly enhanced reasoning capabilities in large language models (LLMs), these techniques remain underexplored in multi-modal LLMs for video captioning. This paper presents the…

Computer Vision and Pattern Recognition · Computer Science 2025-06-03 Desen Meng , Rui Huang , Zhilin Dai , Xinhao Li , Yifan Xu , Jun Zhang , Zhenpeng Huang , Meng Zhang , Lingshu Zhang , Yi Liu , Limin Wang

Aligning large language models (LLMs) with human preferences is crucial for enhancing their utility in terms of helpfulness, truthfulness, safety, harmlessness, and interestingness. Existing methods for achieving this alignment often…

Computation and Language · Computer Science 2024-07-04 Wenhao Liu , Xiaohua Wang , Muling Wu , Tianlong Li , Changze Lv , Zixuan Ling , Jianhao Zhu , Cenyuan Zhang , Xiaoqing Zheng , Xuanjing Huang

Reinforcement Learning from Human Feedback (RLHF) has shown potential in qualitative tasks where easily defined performance measures are lacking. However, there are drawbacks when RLHF is commonly used to optimize for average human…

Artificial Intelligence · Computer Science 2024-06-05 Li Ding , Jenny Zhang , Jeff Clune , Lee Spector , Joel Lehman

Recent advancements in image captioning have explored text-only training methods to overcome the limitations of paired image-text data. However, existing text-only training methods often overlook the modality gap between using text data…

Computer Vision and Pattern Recognition · Computer Science 2024-09-27 Soeun Lee , Si-Woo Kim , Taewhan Kim , Dong-Jin Kim