publications

2021

1. NAACL21

   DATE: Detecting Anomalies in Text via Self-Supervision of Transformers

   Andrei Manolache, Florin Brad, and Elena Burceanu

   In Proceedings of the 2021 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies Jun 2021

   Abs

   Leveraging deep learning models for Anomaly Detection (AD) has seen widespread use in recent years due to superior performances over traditional methods. Recent deep methods for anomalies in images learn better features of normality in an end-to-end self-supervised setting. These methods train a model to discriminate between different transformations applied to visual data and then use the output to compute an anomaly score. We use this approach for AD in text, by introducing a novel pretext task on text sequences. We learn our DATE model end-to-end, enforcing two independent and complementary self-supervision signals, one at the token-level and one at the sequence-level. Under this new task formulation, we show strong quantitative and qualitative results on the 20Newsgroups and AG News datasets. In the semi-supervised setting, we outperform state-of-the-art results by +13.5% and +6.9%, respectively (AUROC). In the unsupervised configuration, DATE surpasses all other methods even when 10% of its training data is contaminated with outliers (compared with 0% for the others).

2. arXiv

   ICLR 2021 Challenge for Computational Geometry & Topology: Design and Results

   Nina Miolane, Matteo Caorsi, Umberto Lupo, and 30 more authors

   CoRR Jun 2021

2022

1. EMNLP22

   Rethinking the Authorship Verification Experimental Setups

   Florin Brad, Andrei Manolache, Elena Burceanu, and 3 more authors

   Dec 2022
2. NeurIPS22

   VeriDark: A Large-Scale Benchmark for Authorship Verification on the Dark Web

   Andrei Manolache, Florin Brad, Antonio Barbalau, and 2 more authors

   Dec 2022
3. NeurIPS22

   AnoShift: A Distribution Shift Benchmark for Unsupervised Anomaly Detection

   Marius Drăgoi, Elena Burceanu, Emanuela Haller, and 2 more authors

   Dec 2022