The value of human data annotation for machine learning based anomaly detection in environmental systems
- Swiss Federal Institute of Aquatic Science and Technology (Eawag), Dübendorf (Switzerland); Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland)
- onCyt Microbiology AG, Zürich (Switzerland)
- Swiss Federal Institute of Aquatic Science and Technology (Eawag), Dübendorf (Switzerland)
- Swiss Federal Institute of Aquatic Science and Technology (Eawag), Dübendorf (Switzerland); Lund Univ. (Sweden)
- Ecole Polytechnique Federale Lausanne (Switzerland)
- Université Savoie Mont Blanc, Thonon-les-Bains (France)
- Swiss Federal Institute of Aquatic Science and Technology (Eawag), Dübendorf (Switzerland); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Anomaly detection is the process of identifying unexpected data samples in datasets. Automated anomaly detection is either performed using supervised machine learning models, which require a labelled dataset for their calibration, or unsupervised models, which do not require labels. While academic research has produced a vast array of tools and machine learning models for automated anomaly detection, the research community focused on environmental systems still lacks a comparative analysis that is simultaneously comprehensive, objective, and systematic. This knowledge gap is addressed for the first time in this study, where 15 different supervised and unsupervised anomaly detection models are evaluated on 5 different environmental datasets from engineered and natural aquatic systems. To this end, anomaly detection performance, labelling efforts, as well as the impact of model and algorithm tuning are taken into account. As a result, our analysis reveals the relative strengths and weaknesses of the different approaches in an objective manner without bias for any particular paradigm in machine learning. Most importantly, our results show that expert-based data annotation is extremely valuable for anomaly detection based on machine learning.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE; Eawag Discretionary Funds
- Grant/Contract Number:
- AC05-00OR22725; 5221.00492.012.02
- OSTI ID:
- 1827039
- Journal Information:
- Water Research, Vol. 206; ISSN 0043-1354
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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