Papers by Wenyan Xu
LLM-as-Scheduler: Agentic Workflow Dynamic Scheduling (2026.acl-long)
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| Challenge: | Experiments show that LAS cuts token usage by 43% and reduces end-to-end latency by more than 36%, while causing at most a 1.4 percentage-point drop in accuracy compared with a strong fixed workflow. |
| Approach: | They propose a system that dynamically chooses the right workflow for each query. |
| Outcome: | Experiments show that LAS cuts token usage by 43% and reduces end-to-end latency by more than 36% while causing at most a 1.4 percentage-point drop in accuracy compared with a strong fixed workflow. |
PromptSculptor: Multi-Agent Based Text-to-Image Prompt Optimization (2025.emnlp-demos)
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| Challenge: | PromptSculptor automates the iterative prompt optimization process for Text-to-Image models . previous work focused on generating detailed, high-quality prompts based on user feedback . |
| Approach: | They propose a framework that decomposes a task into four specialized agents . they use Chain-of-Thought reasoning to transform a short, vague user prompt into a comprehensive, refined prompt. |
| Outcome: | The proposed framework significantly improves output quality and reduces iterations needed for user satisfaction. |
Words Worth a Thousand Pictures: Measuring and Understanding Perceptual Variability in Text-to-Image Generation (2024.emnlp-main)
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Raphael Tang, Crystina Zhang, Lixinyu Xu, Yao Lu, Wenyan Li, Pontus Stenetorp, Jimmy Lin, Ferhan Ture
| Challenge: | Current diffusion models do not cover recent models, thus we curate three test sets for evaluation. |
| Approach: | They propose a human-calibrated measure of variability in a set of images bootstrapped from existing image-pair perceptual distances. |
| Outcome: | The proposed model outperforms nine baselines by 18 points in accuracy and matches graded human judgements 78% of the time. |