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Hongchao Zhang

6 accepted papers

2026

Modeling Spectral Energy Shifts in Spatio-Temporal Graph Anomaly Detection

ICML 2026poster

Graph anomaly detection methods aim to distinguish anomalous nodes. While prior methods characterize anomalies through increased variation in the spectral energy distributions, they overlook those that result in decreased variation, i.e., camouflaged anomalies that appear normal. We show that this t…

Cited by 0SourceScholar
2024

Fault Tolerant Neural Control Barrier Functions for Robotic Systems under Sensor Faults and Attacks

ICRA 2024poster

Safety is a fundamental requirement of many robotic systems. Control barrier function (CBF)-based approaches have been proposed to guarantee the safety of robotic systems. However, the effectiveness of these approaches highly relies on the choice of CBFs. Inspired by the universal approximation powe…

Cited by 2SourcecodeScholar
2024

SEEV: Synthesis with Efficient Exact Verification for ReLU Neural Barrier Functions

NeurIPS 2024poster

Neural Control Barrier Functions (NCBFs) have shown significant promise in enforcing safety constraints on nonlinear autonomous systems. State-of-the-art exact approaches to verifying safety of NCBF-based controllers exploit the piecewise-linear structure of ReLU neural networks, however, such appro…

2023

Exact Verification of ReLU Neural Control Barrier Functions

NeurIPS 2023poster

Control Barrier Functions (CBFs) are a popular approach for safe control of nonlinear systems. In CBF-based control, the desired safety properties of the system are mapped to nonnegativity of a CBF, and the control input is chosen to ensure that the CBF remains nonnegative for all time. Recently, ma…

2021

Model-based Reinforcement Learning with Provable Safety Guarantees via Control Barrier Functions

ICRA 2021poster

Safety is a critical property in applications including robotics, transportation, and energy. Safety is especially challenging in reinforcement learning (RL) settings, in which uncertainty of the system dynamics may cause safety violations during exploration. Control Barrier Functions (CBFs), which…

Cited by 10SourceScholar