Jiazheng Xu

Hi, welcome to my Github 👋

I am Jiazheng Xu, a fourth-year PhD student in Tsinghua University.

• 🔭 Interested in multimodal generative models, especially RLHF and alignment. Find my up-to-date publication list in Google Scholar!
• 🌱 Some of my proud leading works about RLHF for multimodal generative models:

* ImageReward (NeurIPS'23): the first general-purpose text-to-image human preference reward model (RM) for RLHF, outperforming CLIP/BLIP/Aesthetic by 30% in terms of human preference prediction. * CogVideoX (ICLR'25): a large-scale diffusion transformer models designed for generating videos based on text prompts. * VisionReward (AAAI'26): a fine-grained and multi-dimensional reward model for image and video generation, outperforming VideoScore by 17.2% and enabling multi-objective optimization, applied to the RLHF of CogVideoX, boosting preference by 30%.

• 🌱 I'm also honored to work with the team on multimodal foundation models:

* CogVLM (NeurIPS'24): a powerful open-source visual language model (VLM), which achieves state-of-the-art performance on 10 classic cross-modal benchmarks. * CogAgent (CVPR'24): a visual agent being able to return a plan, next action, and specific operations with coordinates for any given task on any GUI screenshot, enhancing GUI-related question-answering capabilities. * GLM-4.1V-Thinking / GLM-4.5V / GLM-4.6V: a series of VLMs with reasoning paradigms, which achieved the strongest performance upon release.

• 💬 Feel free to drop me an email for:

* Any form of collaboration * Any issue about my works or code * Interesting ideas to discuss or just chatting

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