collaborators

5 papers

cs.SE2026

ConcoLixir: Reactive LLM Discovery Oracles for Python Concolic Testing

Dong Chen, Chih-Duo Hong, Fang Yu

Concolic testing combines concrete execution with symbolic constraint solving, but Python programs expose recurring limits. Library calls can cause symbolic variables to downgrade…

cs.LG2026

Signature filtering: a lightweight enhancement for statistical watermark detection in large language models

Chih-Duo Hong, Yen-Pang Chen, Fang Yu

Statistical watermarks help organizations attribute large language model (LLM) outputs, yet existing detectors often struggle when watermark signals are weak, texts are repetitive,…

cs.SE2026

Influence-Guided Concolic Testing of Transformer Robustness

Chih-Duo Hong, Chih-Cheng Yang, Yu Wang +1

Concolic testing for neural networks alternates concrete execution with constraint solving to search for inputs that flip model decisions. We present a concolic tester for Transfor…

cs.LG2026

Robustness Verification of Recurrent Neural Networks with Abstraction Refinement

Li-Jen Lin, Chih-Duo Hong

Certified local robustness verification for recurrent neural networks (RNNs) is challenging because approximation errors introduced by nonlinear relaxations can propagate through r…

cs.LG2026

Concolic Testing on Individual Fairness of Neural Network Models

Ming-I Huang, Chih-Duo Hong, Fang Yu

This paper introduces PyFair, a formal framework for evaluating and verifying individual fairness of Deep Neural Networks (DNNs). By adapting the concolic testing tool PyCT, we gen…