Focus Period Halmstad University 2026
PhD Student
University of Waikato (New Zealand)
Jia (Justin) Liu is a PhD candidate at the University of Waikato, New Zealand, supervised by Prof. Albert Bifet. His research focuses on streaming machine learning and anomaly detection, with particular emphasis on isolation forest methods for evolving data streams. His work addresses core challenges in stream learning, including concept drift adaptation, semi-supervised learning under label scarcity, and evaluation methodologies for imbalanced streaming data. His recent contributions include the Adaptive Isolation Forest (Discovery Science 2025) and the Streaming Isolation Forest (PAKDD 2025), alongside ongoing work on semi-supervised extensions of isolation-based detectors. He has submitted his doctoral thesis and expects to complete his degree in 2026.