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Weijie Tu

6 accepted papers

2026

When Preference Labels Fall Short: Aligning Diffusion Models from Real Data

ICML 2026poster

Preference alignment aims to guide generative models by learning from comparisons between preferred and non-preferred samples. In practice, most existing approaches rely on preference pairs constructed from model-generated images. Such supervision is inherently relative and can be ambiguous when bot…

Cited by 0SourceScholar
2026

Where Detectors Fail: Probing Generative Space for Generalizable AI-Generated Image Detection

ICML 2026poster

Detecting AI-generated images (AIGI) remains challenging because detectors often fail to generalize to unseen generators. Although existing methods are trained on large datasets, their performance still degrades when generation settings change, indicating that data scale alone is insufficient and th…

Cited by 0SourceScholar
2025

Ranked from Within: Ranking Large Multimodal Models Without Labels

ICML 2025poster

Can the relative performance of a pre-trained large multimodal model (LMM) be predicted without access to labels? As LMMs proliferate, it becomes increasingly important to develop efficient ways to choose between them when faced with new data or tasks. The usual approach does the equivalent of givin…

Cited by 0SourcePDFScholar
2024

An Empirical Study Into What Matters for Calibrating Vision-Language Models

ICML 2024poster

Vision-Language Models (VLMs) have emerged as the dominant approach for zero-shot recognition, adept at handling diverse scenarios and significant distribution changes. However, their deployment in risk-sensitive areas requires a deeper understanding of their uncertainty estimation capabilities, a r…

Cited by 8SourcePDFScholar
2023

A Bag-of-Prototypes Representation for Dataset-Level Applications

CVPR 2023poster

This work investigates dataset vectorization for two dataset-level tasks: assessing training set suitability and test set difficulty. The former measures how suitable a training set is for a target domain, while the latter studies how challenging a test set is for a learned model. Central of the two…

Cited by 12SourcePDFScholar
2023

A Closer Look at the Robustness of Contrastive Language-Image Pre-Training (CLIP)

NeurIPS 2023poster

Contrastive Language-Image Pre-training (CLIP) models have demonstrated remarkable generalization capabilities across multiple challenging distribution shifts. However, there is still much to be explored in terms of their robustness to the variations of specific visual factors. In real-world applica…

Cited by 40SourcePDFScholar