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HYDRA: A Multi-Level Hierarchy-Driven Approach for Robust Anomaly Detection in Time Series

Summary: HYDRA is an unsupervised, normalization-light detector combining graph-selected approximate nearest neighbors with fine-to-coarse, multi-resolution anomaly evidence. Its hierarchical ensemble robustly detects isolated and persistent anomalies, ranking first on 40 TSB-AD datasets while scaling to ultra-long series. (summarized by gpt-5.6-luna on Jul 26 2026)

Paper ID
hbc5e67f9c0a63c7f
Venue
SIGMOD
Year
2026
Pagerank
4.9769913e-05
Overall Rank
10,480 | 29.57%
DOI
10.1145/3802074
PDF
Download (CC BY 4.0)

Incoming Non-self Citations Over Time

No non-self incoming citations found for this paper in this database.

Authors

BibTeX Citation

@inproceedings{huang_sigmod26,
        title = {{HYDRA: A Multi-Level Hierarchy-Driven Approach for Robust Anomaly Detection in Time Series}},
        author = {Huang, Mingyi and Liu, Qinghua and Boniol, Paul and Paparrizos, John},
        series = {{SIGMOD} '26},
        booktitle = {Proceedings of the {ACM} {SIGMOD} International Conference on Management of Data},
        publisher = {Association for Computing Machinery},
        doi = {10.1145/3802074},
        url = {https://dl.acm.org/doi/10.1145/3802074},
        year = {2026}
}

Incoming Citations (Sorted by Pagerank)

Showing 2 of 2 citing papers.

Rank Citing Paper Year Venue Pagerank
10,494 MUFASA: Fast and Accurate Multivariate Time-Series Clustering 2026 SIGMOD 4.9769913e-05
10,521 The Power of Anomaly Detection in Predictive Maintenance: [Experiments & Analysis] 2026 SIGMOD 4.9769913e-05
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Outgoing Citations (Sorted by Pagerank)

Showing 32 of 32 cited papers.

Citations counted here include only citations to other VLDB/SIGMOD/CIDR/PODS papers in this database.

Rank Cited Paper Year Venue Pagerank
142 LOF: Identifying Density-Based Local Outliers 2000 SIGMOD 0.00029189529
344 A Comprehensive Survey and Experimental Comparison of Graph-Based Approximate Nearest Neighbor Search 2021 VLDB 0.00020455839
583 Efficient Algorithms for Mining Outliers from Large Data Sets 2000 SIGMOD 0.00015952617
1,005 Anomaly Detection in Time Series: A Comprehensive Evaluation 2022 VLDB 0.00012584107
1,480 Distance-based Outlier Detection in Data Streams 2016 VLDB 0.00010536005
1,579 k-Shape: Efficient and Accurate Clustering of Time Series 2015 SIGMOD 0.00010182038
1,629 SAND: Streaming Subsequence Anomaly Detection 2021 VLDB 0.0001003165
1,938 TSB-UAD: An End-to-End Benchmark Suite for Univariate Time-Series Anomaly Detection 2022 VLDB 9.334286e-05
1,974 Decomposed Bounded Floats for Fast Compression and Queries 2021 VLDB 9.2806652e-05
2,376 Series2Graph: Graph-based Subsequence Anomaly Detection for Time Series 2020 VLDB 8.5517908e-05
3,299 Volume Under the Surface: A New Accuracy Evaluation Measure for Time-Series Anomaly Detection 2022 VLDB 7.441222e-05
3,728 Choose Wisely: An Extensive Evaluation of Model Selection for Anomaly Detection in Time Series 2023 VLDB 7.0667899e-05
4,317 GRAIL: Efficient Time-Series Representation Learning 2019 VLDB 6.6651881e-05
4,705 Debunking Four Long-Standing Misconceptions of Time-Series Distance Measures 2020 SIGMOD 6.4591377e-05
5,477 Good to the Last Bit: Data-Driven Encoding with CodecDB 2021 SIGMOD 6.1152706e-05
6,192 VergeDB: A Database for IoT Analytics on Edge Devices 2021 CIDR 5.8540507e-05
7,096 Time-Series Clustering: A Comprehensive Study of Data Mining, Machine Learning, and Deep Learning Methods 2025 VLDB 5.5991152e-05
7,647 A Structured Study of Multivariate Time-Series Distance Measures 2025 SIGMOD 5.4746904e-05
8,166 PIDS: Attribute Decomposition for Improved Compression and Query Performance in Columnar Storage 2020 VLDB 5.3846089e-05
9,493 TSB-AutoAD: Towards Automated Solutions for Time-Series Anomaly Detection 2025 VLDB 5.168414e-05
9,494 Beyond Compression: A Comprehensive Evaluation of Lossless Floating-Point Compression 2025 VLDB 5.168414e-05
9,499 Time-Series Anomaly Detection: Overview and New Trends 2024 VLDB 5.168414e-05
9,633 Theseus: Navigating the Labyrinth of Time-Series Anomaly Detection 2022 VLDB 5.1459383e-05
9,665 Odyssey: An Engine Enabling The Time-Series Clustering Journey 2023 VLDB 5.142891e-05
9,916 SPARTAN: Data-Adaptive Symbolic Time-Series Approximation 2025 SIGMOD 5.1079647e-05
10,494 MUFASA: Fast and Accurate Multivariate Time-Series Clustering 2026 SIGMOD 4.9769913e-05
10,521 The Power of Anomaly Detection in Predictive Maintenance: [Experiments & Analysis] 2026 SIGMOD 4.9769913e-05
11,355 BURST: Rendering Clustering Techniques Suitable for Evolving Streams 2025 VLDB 4.9769913e-05
11,425 EasyAD: A Demonstration of Automated Solutions for Time-Series Anomaly Detection 2025 VLDB 4.9769913e-05
11,755 Accelerating Similarity Search for Elastic Measures: A Study and New Generalization of Lower Bounding Distances 2023 VLDB 4.9769913e-05
13,665 SAIL: A Voyage to Symbolic Approximation Solutions for Time-Series Analysis 2025 VLDB -
13,782 SAND in Action: Subsequence Anomaly Detection for Streams 2021 VLDB -
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