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Practical Data Analysis

You're reading from  Practical Data Analysis

Product type Book
Published in Oct 2013
Publisher Packt
ISBN-13 9781783280995
Pages 360 pages
Edition 1st Edition
Languages
Author (1):
Hector Cuesta Hector Cuesta
Profile icon Hector Cuesta
Toc

Table of Contents (24) Chapters close

Practical Data Analysis
Credits
Foreword
About the Author
Acknowledgments
About the Reviewers
www.PacktPub.com
Preface
1. Getting Started 2. Working with Data 3. Data Visualization 4. Text Classification 5. Similarity-based Image Retrieval 6. Simulation of Stock Prices 7. Predicting Gold Prices 8. Working with Support Vector Machines 9. Modeling Infectious Disease with Cellular Automata 10. Working with Social Graphs 11. Sentiment Analysis of Twitter Data 12. Data Processing and Aggregation with MongoDB 13. Working with MapReduce 14. Online Data Analysis with IPython and Wakari Setting Up the Infrastructure Index

Getting started with support vector machine


The SVM is a supervised classification method based in a kernel geometrical construction as is shown in the following figure. SVM can be applied either for classification or regression. SVM will look for the best decision boundary that split the points into the class that they belong. To accomplish this SVM, we will look for the largest margin (space that is free of training samples parallel to the decision boundary). In the following figure, we can see the margin as the space between the dividing line and dotted lines. SVM will always look for a global solution due to the algorithm only care about the vectors close to the decision boundary. Those points in the edge of the margin are the support vectors. However, this is only for two-dimensional spaces, when we have high-dimensional spaces the decision boundaries turn into hyperplane (maximum decision margin) and the SVMs will look for the maximum-margin hyperplanes. In this chapter we will only...

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