Search Results for author: Mahsa Salehi

Found 20 papers, 9 papers with code

DACAD: Domain Adaptation Contrastive Learning for Anomaly Detection in Multivariate Time Series

no code implementations17 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.

Anomaly Detection Contrastive Learning +4

EEG2Rep: Enhancing Self-supervised EEG Representation Through Informative Masked Inputs

1 code implementation17 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.

EEG Representation Learning

Guarding the Grid: Enhancing Resilience in Automated Residential Demand Response Against False Data Injection Attacks

no code implementations14 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.

Anomaly Detection Decision Making +1

Series2Vec: Similarity-based Self-supervised Representation Learning for Time Series Classification

1 code implementation7 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.

Data Augmentation Representation Learning +4

Open-Set Graph Anomaly Detection via Normal Structure Regularisation

no code implementations12 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.

Graph Anomaly Detection Supervised Anomaly Detection

Improving Position Encoding of Transformers for Multivariate Time Series Classification

1 code implementation26 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).

Anomaly Detection Position +3

Proximity Forest 2.0: A new effective and scalable similarity-based classifier for time series

1 code implementation12 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.

Dynamic Time Warping Time Series +1

Cross-Domain Graph Anomaly Detection via Anomaly-aware Contrastive Alignment

1 code implementation2 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.

Contrastive Learning Domain Adaptation +1

Deep Learning for Time Series Anomaly Detection: A Survey

1 code implementation9 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.

Anomaly Detection Time Series +1

Detecting Singleton Spams in Reviews via Learning Deep Anomalous Temporal Aspect-Sentiment Patterns

1 code implementation2 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.

Feature Engineering

An Eager Splitting Strategy for Online Decision Trees

no code implementations20 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.

Emergent and Unspecified Behaviors in Streaming Decision Trees

no code implementations16 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.

Detecting Driver's Distraction using Long-term Recurrent Convolutional Network

no code implementations14 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.

Brain Computer Interface EEG +3

Enabling Efficient Privacy-Assured Outlier Detection over Encrypted Incremental Datasets

no code implementations14 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.

Anomaly Detection Outlier Detection +1

Online Semi-Supervised Concept Drift Detection with Density Estimation

no code implementations25 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.

Density Estimation

Extremely Fast Decision Tree

no code implementations24 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.

General Classification

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