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# Semantically-Aware Rewards for Open-Ended R1 Training in Free-Form Generation
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[[📖 Paper](https://arxiv.org/abs/2506.15068)]
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## About Open-Ended R1 Training
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As open-ended long-form generation gains traction, reliably judging the quality of multi-sentence and paragraph-length outputs has become a major hurdle—traditional overlap metrics like ROUGE-L and BERTScore often miss nuances of coherence, style, and relevance, and can be skewed by pretraining biases. This leaves a critical gap in evaluation methods for guiding and training models that produce lengthy, free-form text.
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# VideoHallu: Evaluating and Mitigating Multi-modal Hallucinations for Synthetic Videos
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[Zongxia Li*](https://zli12321.github.io/), [Xiyang Wu*](https://wuxiyang1996.github.io/), [Yubin Qin](https://www.linkedin.com/in/yubin-qin/), [Guangyao Shi](https://guangyaoshi.github.io/), [Hongyang Du](https://www.linkedin.com/in/hongyangdu/), [Dinesh Manocha](https://www.cs.umd.edu/people/dmanocha), [Tianyi Zhou](https://tianyizhou.github.io/), [Jordan Lee Boyd-Graber](https://users.umiacs.umd.edu/~ying/)
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We introduce VideoHallu, a curated dataset that includes videos generated by seven video generation models and a question-answer set to test MLLM's abilities to catch generated videos' abnormalities.
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We also use GRPO to train [Qwen-2.5-VL-7B](https://huggingface.co/Qwen/Qwen2.5-VL-7B-Instruct) on a subset of our dataset and show improvement on generated video understanding.
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## 🔥 News
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- [2025/05/02] We release our datasets in [huggingface](https://huggingface.co/datasets/IntelligenceLab/VideoHallu)🤗.
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## 🏅 <a name='rb'></a>Reward Model
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- RewardBert is specifically targeted for free-form GRPO training, where the answers cannot be evaluated based on simple correctness.
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- We use [ModernBERT](https://huggingface.co/docs/transformers/en/model_doc/modernbert) as the base model to finetune on [MOCHA](https://arxiv.org/abs/2010.03636), [Prometheus-preference](https://huggingface.co/datasets/prometheus-eval/Preference-Collection), [Pedants](https://arxiv.org/abs/2402.11161) to evaluate free-form text generations. We use RewardBert as the reward in GRPO finetuning.
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If you find our work helpful for your research, please consider citing our work.
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```
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@misc{li2025videohalluevaluatingmitigatingmultimodal,
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title={VideoHallu: Evaluating and Mitigating Multi-modal Hallucinations for Synthetic Videos},
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author={Zongxia Li and Xiyang Wu and Yubin Qin and Guangyao Shi and Hongyang Du and Dinesh Manocha and Tianyi Zhou and Jordan Lee Boyd-Graber},
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year={2025},
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eprint={2505.01481},
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archivePrefix={arXiv},
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primaryClass={cs.CV},
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url={https://arxiv.org/abs/2505.01481},
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}
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@misc{li2025semanticallyawarerewardsopenendedr1,
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title={Semantically-Aware Rewards for Open-Ended R1 Training in Free-Form Generation},
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author={Zongxia Li and Yapei Chang and Yuhang Zhou and Xiyang Wu and Zichao Liang and Yoo Yeon Sung and Jordan Lee Boyd-Graber},
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}
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##
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@misc{
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title={
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author={
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year={2024},
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eprint={2310.14566},
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archivePrefix={arXiv},
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primaryClass={cs.CV},
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url={https://arxiv.org/abs/2310.14566},
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}
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@misc{wu2024autohallusionautomaticgenerationhallucination,
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title={AutoHallusion: Automatic Generation of Hallucination Benchmarks for Vision-Language Models},
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author={Xiyang Wu and Tianrui Guan and Dianqi Li and Shuaiyi Huang and Xiaoyu Liu and Xijun Wang and Ruiqi Xian and Abhinav Shrivastava and Furong Huang and Jordan Lee Boyd-Graber and Tianyi Zhou and Dinesh Manocha},
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year={2024},
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eprint={2406.10900},
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archivePrefix={arXiv},
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primaryClass={cs.CV},
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url={https://arxiv.org/abs/2406.10900},
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}
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@misc{li2025surveystateartlarge,
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title={A Survey of State of the Art Large Vision Language Models: Alignment, Benchmark, Evaluations and Challenges},
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author={Zongxia Li and Xiyang Wu and Hongyang Du and Fuxiao Liu and Huy Nghiem and Guangyao Shi},
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year={2025},
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eprint={
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archivePrefix={arXiv},
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primaryClass={cs.CV},
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url={https://arxiv.org/abs/
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}
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```
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# Semantically-Aware Rewards for Open-Ended R1 Training in Free-Form Generation
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[[📖 Paper](https://arxiv.org/abs/2506.15068)]
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## About Open-Ended R1 Training
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As open-ended long-form generation gains traction, reliably judging the quality of multi-sentence and paragraph-length outputs has become a major hurdle—traditional overlap metrics like ROUGE-L and BERTScore often miss nuances of coherence, style, and relevance, and can be skewed by pretraining biases. This leaves a critical gap in evaluation methods for guiding and training models that produce lengthy, free-form text.
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<!-- # VideoHallu: Evaluating and Mitigating Multi-modal Hallucinations for Synthetic Videos
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[Zongxia Li*](https://zli12321.github.io/), [Xiyang Wu*](https://wuxiyang1996.github.io/), [Yubin Qin](https://www.linkedin.com/in/yubin-qin/), [Guangyao Shi](https://guangyaoshi.github.io/), [Hongyang Du](https://www.linkedin.com/in/hongyangdu/), [Dinesh Manocha](https://www.cs.umd.edu/people/dmanocha), [Tianyi Zhou](https://tianyizhou.github.io/), [Jordan Lee Boyd-Graber](https://users.umiacs.umd.edu/~ying/)
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We introduce VideoHallu, a curated dataset that includes videos generated by seven video generation models and a question-answer set to test MLLM's abilities to catch generated videos' abnormalities.
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We also use GRPO to train [Qwen-2.5-VL-7B](https://huggingface.co/Qwen/Qwen2.5-VL-7B-Instruct) on a subset of our dataset and show improvement on generated video understanding. -->
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<!-- ## 🔥 News
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- [2025/05/02] We release our datasets in [huggingface](https://huggingface.co/datasets/IntelligenceLab/VideoHallu)🤗.
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-->
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## 🏅 <a name='rb'></a> 🔥 Reward Model
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- RewardBert is specifically targeted for free-form GRPO training, where the answers cannot be evaluated based on simple correctness.
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- We use [ModernBERT](https://huggingface.co/docs/transformers/en/model_doc/modernbert) as the base model to finetune on [MOCHA](https://arxiv.org/abs/2010.03636), [Prometheus-preference](https://huggingface.co/datasets/prometheus-eval/Preference-Collection), [Pedants](https://arxiv.org/abs/2402.11161) to evaluate free-form text generations. We use RewardBert as the reward in GRPO finetuning.
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If you find our work helpful for your research, please consider citing our work.
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```
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@misc{li2025semanticallyawarerewardsopenendedr1,
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title={Semantically-Aware Rewards for Open-Ended R1 Training in Free-Form Generation},
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author={Zongxia Li and Yapei Chang and Yuhang Zhou and Xiyang Wu and Zichao Liang and Yoo Yeon Sung and Jordan Lee Boyd-Graber},
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}
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## VLMs that use RewardBert as an evaluator
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@misc{li2025videohalluevaluatingmitigatingmultimodal,
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title={VideoHallu: Evaluating and Mitigating Multi-modal Hallucinations for Synthetic Videos},
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author={Zongxia Li and Xiyang Wu and Yubin Qin and Guangyao Shi and Hongyang Du and Dinesh Manocha and Tianyi Zhou and Jordan Lee Boyd-Graber},
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year={2025},
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eprint={2505.01481},
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archivePrefix={arXiv},
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primaryClass={cs.CV},
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url={https://arxiv.org/abs/2505.01481},
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}
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```
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