Guixiang Ma

Securing Behavior-based Opinion Spam Detection

2018 · arXiv (Cornell University)

Reviews spams are prevalent in e-commerce to manipulate product ranking and customers decisions maliciously. While spams generated based on simple spamming strategy can be detected effectively, hardened spammers can evade regular detectors via more advanced …

Provable Robust Saliency-based Explanations

2022 · arXiv (Cornell University)

To foster trust in machine learning models, explanations must be faithful and stable for consistent insights. Existing relevant works rely on the $\ell_p$ distance for stability assessment, which diverges from human perception. Besides, existing adversarial …