no code implementations • 17 Apr 2024 • Zahra Zamanzadeh Darban, Geoffrey I. Webb, Mahsa Salehi
In this paper, we propose a novel Domain Adaptation Contrastive learning for Anomaly Detection in multivariate time series (DACAD) model to address this issue by combining UDA and contrastive representation learning.
no code implementations • 22 Feb 2024 • Mahsa Salehi, Kalin Stefanov, Ehsan Shareghi
In this paper we study the variations in human brain activity when listening to real and fake audio.
1 code implementation • 17 Feb 2024 • Navid Mohammadi Foumani, Geoffrey Mackellar, Soheila Ghane, Saad Irtza, Nam Nguyen, Mahsa Salehi
We show that our semantic subsequence preserving improves the existing masking methods in self-prediction literature and find that preserving 50\% of EEG recordings will result in the most accurate results on all 6 tasks on average.
no code implementations • 14 Dec 2023 • Thusitha Dayaratne, Carsten Rudolph, Ariel Liebman, Mahsa Salehi
Utility companies are increasingly leveraging residential demand flexibility and the proliferation of smart/IoT devices to enhance the effectiveness of residential demand response (DR) programs through automated device scheduling.
1 code implementation • 7 Dec 2023 • Navid Mohammadi Foumani, Chang Wei Tan, Geoffrey I. Webb, Hamid Rezatofighi, Mahsa Salehi
Our evaluation of Series2Vec on nine large real-world datasets, along with the UCR/UEA archive, shows enhanced performance compared to current state-of-the-art self-supervised techniques for time series.
no code implementations • 12 Nov 2023 • Qizhou Wang, Guansong Pang, Mahsa Salehi, Christopher Leckie
However, current methods tend to over-emphasise fitting the seen anomalies, leading to a weak generalisation ability to detect unseen anomalies, i. e., those that are not illustrated by the labelled anomaly nodes.
no code implementations • 18 Aug 2023 • Zahra Zamanzadeh Darban, Geoffrey I. Webb, Shirui Pan, Charu C. Aggarwal, Mahsa Salehi
Our research shows the potential of contrastive representation learning to advance time series anomaly detection.
1 code implementation • 26 May 2023 • Navid Mohammadi Foumani, Chang Wei Tan, Geoffrey I. Webb, Mahsa Salehi
We then proposed a new absolute position encoding method dedicated to time series data called time Absolute Position Encoding (tAPE).
Ranked #1 on Time Series Classification on Heartbeat
1 code implementation • 12 Apr 2023 • Matthieu Herrmann, Chang Wei Tan, Mahsa Salehi, Geoffrey I. Webb
Time series classification (TSC) is a challenging task due to the diversity of types of feature that may be relevant for different classification tasks, including trends, variance, frequency, magnitude, and various patterns.
1 code implementation • 6 Feb 2023 • Navid Mohammadi Foumani, Lynn Miller, Chang Wei Tan, Geoffrey I. Webb, Germain Forestier, Mahsa Salehi
Time Series Classification and Extrinsic Regression are important and challenging machine learning tasks.
1 code implementation • 2 Dec 2022 • Qizhou Wang, Guansong Pang, Mahsa Salehi, Wray Buntine, Christopher Leckie
In doing so, ACT effectively transfers anomaly-informed knowledge from the source graph to learn the complex node relations of the normal class for GAD on the target graph without any specification of the anomaly distributions.
1 code implementation • 9 Nov 2022 • Zahra Zamanzadeh Darban, Geoffrey I. Webb, Shirui Pan, Charu C. Aggarwal, Mahsa Salehi
Time series anomaly detection has applications in a wide range of research fields and applications, including manufacturing and healthcare.
1 code implementation • 2021 International Conference on Data Mining Workshops (ICDMW) 2022 • Navid Mohammadi Foumani, Chang Wei Tan, Mahsa Salehi
Time series classification algorithms have been mainly dominated by non-deep learning models.
Ranked #1 on Time Series Classification on pendigits
1 code implementation • 2 Jan 2021 • Yassien Shaalan, Xiuzhen Zhang, Jeffrey Chan, Mahsa Salehi
Meanwhile, opinion spams spread widely and the detection of spam reviews becomes critically important for ensuring the integrity of the echo system of online reviews.
no code implementations • 20 Oct 2020 • Chaitanya Manapragada, Heitor M Gomes, Mahsa Salehi, Albert Bifet, Geoffrey I Webb
In this work, we study in ensemble settings the effectiveness of replacing the split strategy for the state-of-the-art online tree learner, Hoeffding Tree, with a rigorous but more eager splitting strategy that we had previously published as Hoeffding AnyTime Tree.
no code implementations • 16 Oct 2020 • Chaitanya Manapragada, Geoffrey I Webb, Mahsa Salehi, Albert Bifet
Hoeffding trees are the state-of-the-art methods in decision tree learning for evolving data streams.
no code implementations • 14 Apr 2020 • Chang Wei Tan, Mahsa Salehi, Geoffrey Mackellar
In this study we demonstrate a novel Brain Computer Interface (BCI) approach to detect driver distraction events to improve road safety.
no code implementations • 14 Nov 2019 • Shangqi Lai, Xingliang Yuan, Amin Sakzad, Mahsa Salehi, Joseph K. Liu, Dongxi Liu
It realises several cryptographic modules via efficient and interchangeable protocols to support the above cryptographic operations and composes them in the overall protocol to enable outlier detection over encrypted datasets.
no code implementations • 25 Sep 2019 • Chang How Tan, Vincent CS Lee, Mahsa Salehi
The two types of drift that are extensively studied are real drift and virtual drift where the former is the change in posterior probabilities p(y|X) while the latter is the change in distribution of X without affecting the posterior probabilities.
no code implementations • 24 Feb 2018 • Chaitanya Manapragada, Geoff Webb, Mahsa Salehi
We introduce a novel incremental decision tree learning algorithm, Hoeffding Anytime Tree, that is statistically more efficient than the current state-of-the-art, Hoeffding Tree.