Anomaly Detection


Anomaly Detection with Machine Learning at Scale - StreamAnalytix

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Organizations are collecting massive amounts of data from disparate sources. However, they continuously face the challenge of identifying patterns, detecting anomalies, and projecting future trends based on large data sets. Machine learning for anomaly detection provides a promising alternative for the detection and classification of anomalies. Find out how you can implement machine learning to increase speed and effectiveness in identifying and reporting anomalies.


DSC Webinar Series: AI in Action: Real-time Anomaly Detection

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Artificial intelligence is no longer in the future. You will learn how to: Detect anomalies in IoT applications using TIBCO Data Science with deep learning libraries (e.g. H2O, Python, TensorFlow, Amazon SageMaker) Use TIBCO Data Science models on the AWS Marketplace Deploy models into operations for real-time monitoring and surveillance Optimize your business and experience explosive growth with real-time anomaly detection.


Welcome! You are invited to join a webinar: Learning Lab 17: Anomaly Detection with H2O Machine Learning. After registering, you will receive a confirmation email about joining the webinar.

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Welcome to our BRAND NEW Learning Lab on Anomaly Detection for Fraud with H2O. We'll show you how we got a 0.944 AUC on Kaggle's Credit Fraud Challenge. Learning Lab 17 (Why Should I Sign Up?): - Learn about Anomaly Detection - What types exist and the problems it can be used to solve - Learn about Fraud Detection - Why Anomaly Detection helps - Apply an H2O IsolationForest model to financial data - We'll end up with a 0.944 AUC beating out most Supervised Learning Methods (e.g. XGBoost) - Get a 30-minute LIVE code-through - Have lots of FUN with Matt & David!


Anomaly Detection

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Anomaly Detection is the identification of rare occurrences, items, or events of concern due to their differing characteristics from majority of the processed data. Anomalies, or outliers as they are also called, can represent security errors, structural defects, and even bank fraud or medical problems. There are three main forms of anomaly detection. The first type of anomaly detection is unsupervised anomaly detection. This technique detects anomalies in an unlabeled data set by comparing data points to each other, establishing a baseline "normal" outline for the data, and looking for differences between the points.


SpecAE: Spectral AutoEncoder for Anomaly Detection in Attributed Networks

arXiv.org Machine Learning

Anomaly detection aims to distinguish observations that are rare and different from the majority. While most existing algorithms assume that instances are i.i.d., in many practical scenarios, links describing instance-to-instance dependencies and interactions are available. Such systems are called attributed networks. Anomaly detection in attributed networks has various applications such as monitoring suspicious accounts in social media and financial fraud in transaction networks. However, it remains a challenging task since the definition of anomaly becomes more complicated and topological structures are heterogeneous with nodal attributes. In this paper, we propose a spectral convolution and deconvolution based framework -- SpecAE, to project the attributed network into a tailored space to detect global and community anomalies. SpecAE leverages Laplacian sharpening to amplify the distances between representations of anomalies and the ones of the majority. The learned representations along with reconstruction errors are combined with a density estimation model to perform the detection. They are trained jointly as an end-to-end framework. Experiments on real-world datasets demonstrate the effectiveness of SpecAE.


Anomaly Detection in Images - Towards Data Science

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In Machine Learning is normal to deal with Anomaly Detection tasks. Data Science frequently are engaged in problem where they have to show, explain and predict anomalies. I also made a post about Anomaly Detection with Time Series, where I studied an internal system behaviour and I provided anomaly forecasts in the future. In this post I try to solve a different challenge. I change domain of interest: swapping from Time Series to Images.


A Survey on GANs for Anomaly Detection

arXiv.org Machine Learning

Anomaly detection is a significant problem faced in several research areas. Detecting and correctly classifying something unseen as anomalous is a challenging problem that has been tackled in many different manners over the years. Generative Adversarial Networks (GANs) and the adversarial training process have been recently employed to face this task yielding remarkable results. In this paper we survey the principal GAN-based anomaly detection methods, highlighting their pros and cons. Our contributions are the empirical validation of the main GAN models for anomaly detection, the increase of the experimental results on different datasets and the public release of a complete Open Source toolbox for Anomaly Detection using GANs.


Anomaly Detection with Joint Representation Learning of Content and Connection

arXiv.org Machine Learning

Social media sites are becoming a key factor in politics. These platforms are easy to manipulate for the purpose of distorting information space to confuse and distract voters. Past works to identify disruptive patterns are mostly focused on analyzing the content of tweets. In this study, we jointly embed the information from both user posted content as well as a user's follower network, to detect groups of densely connected users in an unsupervised fashion. We then investigate these dense sub-blocks of users to flag anomalous behavior. In our experiments, we study the tweets related to the upcoming 2019 Canadian Elections, and observe a set of densely-connected users engaging in local politics in different provinces, and exhibiting troll-like behavior.


Detecting and preventing cyberattacks with anomaly detection and machine learning

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The Gartner Security & Risk Management Summit is just a few days away, and I'm delighted to have the opportunity to chat with attendees about how anomaly detection and machine learning can help give your organization a more proactive security posture. You don't need to have been in the cybersecurity space for long to be bewildered by and unsure about vendor claims around artificial intelligence, machine learning, and analytics. At Interset (acquired by Micro Focus in February of this year), we have regular conversations with security professionals who struggle to understand which techniques and tools are effective in boosting breach defense in the real world. Ultimately, these conversations lead to an important question for us: How can you implement user and entity behavioral analytics (UEBA) in a way that will enable an efficient security operations center (SOC)? There are multiple factors that go into an effective UEBA implementation, but it's helpful to start with ensuring that the math and machine learning powering the solution are suitable for your security objectives.


Questions to ask while implementing Anomaly detection system

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A.I. based automated Anomaly detection system is gaining popularity nowadays due to the increase in data generated from various devices and the increase in ever evolving sophisticated threats from hackers etc. Anomaly detection systems can be applied across various business scenarios like monitoring financial transactions of a fintech company, highlighting fraudulent activities in a network, e-commerce price glitches among millions of products, and so on. Anomaly detection system can work well in managing millions of metrics at scale and filter them into a number of consumable incidents to create actionable insights. What is the alert frequency (5 minutes/ 10 minutes/ 1 hour or 1 day): Alert frequency is very much dependent on the sensitivity of the process which will be being measured, including the reaction time and other metrics. Some applications demand low latency: like detecting & intimating the suspicious fraudulent payment transactions to users in case of any misuse of the card within minutes. In the case of some applications it can be less sensitive to changes and not so severe, like total inbound & outbound calls from cellular towers, which can be aggregated to an hourly level rather than measuring at 5-minute intervals etc.