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Ruihan Zhang

4 accepted papers

2026

Towards Provably Unlearnable Examples via Bayes Error Optimization

AAAI 2026technical

The recent success of machine learning models, especially large-scale classifiers and language models, relies heavily on training with massive data. These data are often collected from online sources. This raises serious concerns about the protection of user data, as individuals may not have given c

Cited by 0SourcePDFScholar
2022

HCL-TAT: A Hybrid Contrastive Learning Method for Few-shot Event Detection with Task-Adaptive Threshold

EMNLP 2022finding

Event detection has been suffering from constantly emerging event types with lack of sufficient data. Existing works formulate the new problem as few-shot event detection (FSED), and employ two-stage or unified models based on meta-learning to address the problem. However, these methods fall far sho…

2021

Invertible Concept-based Explanations for CNN Models with Non-negative Concept Activation Vectors

AAAI 2021technical

Convolutional neural network (CNN) models for computer vision are powerful but lack explainability in their most basic form. This deficiency remains a key challenge when applying CNNs in important domains. Recent work on explanations through feature importance of approximate linear models has moved…