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Self-Organizing Maps

Self-Organizing Maps. Cao Mai December 14, 2009. Outline. Define Self-Organizing Maps (SOM) Quick Example Explain SOM An example of SOM using MGP dataset Questions. Define. A Self-Organizing Map (SOM) is a way to visually represent multi-dimensional data in an usually 2-D or 3-D manner

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Self-Organizing Maps

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  1. Self-Organizing Maps Cao Mai December 14, 2009

  2. Outline • Define Self-Organizing Maps (SOM) • Quick Example • Explain SOM • An example of SOM using MGP dataset • Questions

  3. Define • A Self-Organizing Map (SOM) is a way to visually represent multi-dimensional data in an usually 2-D or 3-D manner • Similar data is grouped together. • Unsupervised algorithm • Continuously learning and adapting.

  4. Quick Example • World Poverty Levels Source: http://www.ai-junkie.com/ann/som/som5.html

  5. Randomized Map Generation • Randomized weights are assigned to each neuron # of weights per neuron = # of attributes Source: Pyle, D. (2003). Business Modeling and Data Mining. San Francisco: Morgan Kaufmann. Page 228

  6. Training the Map • SOM instance recognition • Use Euclidean distance to match • This gives a measurement of how similar the two sets of data are to each other. Source: Pyle, D. (2003). Business Modeling and Data Mining. San Francisco: Morgan Kaufmann. Page 228

  7. Altering Neurons Weights • Both the Best Match Neuron and its surrounding neighbors weights are altered Source: Pyle, D. (2003). Business Modeling and Data Mining. San Francisco: Morgan Kaufmann. Page 228

  8. Example with MPG dataset • MPG of 398 cars from 1970-1982 • 6 Additional Attributes • Number of cylinders • Displacement • Horsepower • Weight • Acceleration • Model year Except from the MPG dataset

  9. Results Engine Cylinder

  10. Results Engine Cylinder MPG

  11. Results Engine Cylinder Horsepower

  12. Results Engine Cylinder Weight

  13. Results Engine Cylinder Acceleration

  14. Results Engine Cylinder Year

  15. Review • Define SOM • Quick Example • Explain SOM • An example of SOM using MGP dataset • Questions

  16. References • Aleshunas, John. Source Code & Executables. “Self-Organizing Map (SOM)” Retrieved: 2 Dec 2009 <http://mercury.webster.edu/Aleshunas/Canary/Canary_Home.html> • Pyle, D. (2003). Business Modeling and Data Mining. San Francisco: Morgan Kaufmann. • "Self-organizing map" Wikipedia, The Free Encyclopedia. Retrieved: 2 Dec. 2009, Wikimedia Foundation, Inc.. <http://en.wikipedia.org/wiki/Self-organizing_map>

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