Practical Machine Learning: A New Look at Anomaly Detection - Helion
ISBN: 978-14-919-1417-5
stron: 66, Format: ebook
Data wydania: 2014-07-21
Księgarnia: Helion
Cena książki: 72,24 zł (poprzednio: 84,99 zł)
Oszczędzasz: 15% (-12,75 zł)
Finding Data Anomalies You Didn't Know to Look For
Anomaly detection is the detective work of machine learning: finding the unusual, catching the fraud, discovering strange activity in large and complex datasets. But, unlike Sherlock Holmes, you may not know what the puzzle is, much less what “suspects” you’re looking for. This O’Reilly report uses practical examples to explain how the underlying concepts of anomaly detection work.
From banking security to natural sciences, medicine, and marketing, anomaly detection has many useful applications in this age of big data. And the search for anomalies will intensify once the Internet of Things spawns even more new types of data. The concepts described in this report will help you tackle anomaly detection in your own project.
- Use probabilistic models to predict what’s normal and contrast that to what you observe
- Set an adaptive threshold to determine which data falls outside of the normal range, using the t-digest algorithm
- Establish normal fluctuations in complex systems and signals (such as an EKG) with a more adaptive probablistic model
- Use historical data to discover anomalies in sporadic event streams, such as web traffic
- Learn how to use deviations in expected behavior to trigger fraud alerts
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Spis treści
Practical Machine Learning: A New Look at Anomaly Detection eBook -- spis treści
- Practical Machine Learning
- 1. Looking Toward the Future
- 2. The Shape of Anomaly Detection
- Finding Normal
- If you enjoy math, read this description of a probabilistic model of normal
- Human Insight Helps
- Finding Anomalies
- Once again, if you like math, this description of anomalies is for you
- Take-Home Lesson: Key Steps in Anomaly Detection
- A Simple Approach: Threshold Models
- Finding Normal
- 3. Using t-Digest for Threshold Automation
- The Philosophy Behind Setting the Threshold
- Using t-Digest for Accurate Calculation of Extreme Quantiles
- Issues with Simple Thresholds
- 4. More Complex, Adaptive Models
- Windows and Clusters
- Matches with the Windowed Reconstruction: Normal Function
- Mismatches with the Windowed Reconstruction: Anomalous Function
- A Powerful But Simple Technique
- Looking Toward Modeling More Problematic Inputs
- 5. Anomalies in Sporadic Events
- Counts Dont Work Well
- Arrival Times Are the Key
- And Now with the Math
- Event Rate in a Worked Example: Website Traffic Prediction
- Extreme Seasonality Effects
- 6. No Phishing Allowed!
- The Phishing Attack
- The No-Phishing-Allowed Anomaly Detector
- How the Model Works
- Putting It All Together
- 7. Anomaly Detection for the Future
- A. Additional Resources
- GitHub
- Apache Mahout Open Source Project
- Additional Publications
- About the Authors
- Colophon
- Copyright