Programming Collective Intelligence : Building Smart Web 2.0 Applications

Want to tap the power behind search rankings, product recommendations, social bookmarking, and online matchmaking? This fascinating book demonstrates how you can build Web 2.0 applications to mine the enormous amount of data created by people on the Internet. With the sophisticated algorithms in this book, you can write smart programs to access interesting datasets from other web sites, collect data from users of your own applications, and analyze and understand the data once you've found it.

Programming Collective Intelligence takes you into the world of machine learning and statistics, and explains how to draw conclusions about user experience, marketing, personal tastes, and human behavior in general -- all from information that you and others collect every day. Each algorithm is described clearly and concisely with code that can immediately be used on your web site, blog, Wiki, or specialized application. This book explains:

* Collaborative filtering techniques that enable online retailers to recommend products or media
* Methods of clustering to detect groups of similar items in a large dataset
* Search engine features -- crawlers, indexers, query engines, and the PageRank algorithm
* Optimization algorithms that search millions of possible solutions to a problem and choose the best one
* Bayesian filtering, used in spam filters for classifying documents based on word types and other features
* Using decision trees not only to make predictions, but to model the way decisions are made
* Predicting numerical values rather than classifications to build price models
* Support vector machines to match people in online dating sites
* Non-negative matrix factorization to find the independent features in a dataset
* Evolving intelligence for problem solving -- how a computer develops its skill by improving its own code the more it plays a game

Each chapter includes exercises for extending the algorithms to make them more powerful. Go beyond simple database-backed applications and put the wealth of Internet data to work for you.

Chapter 1: Introduction to Collective Intelligence
Chapter 2: Making Recommendations
Chapter 3: Discovering Groups
Chapter 4: Searching and Ranking
Chapter 5: Optimization
Chapter 6: Document Filtering
Chapter 7: Modeling with Decision Trees
Chapter 8: Building Price Models
Chapter 9: Advanced Classification: Kernel Methods and SVMs
Chapter 10: Finding Independent Features
Chapter 11: EVOLVING INTELLIGENCE
Chapter 12: Algorithm Summary

Appendix : Third-Party Libraries
Appendix : Mathematical Formulas