004. Machinelearing W1 04UnsupervisedLearning

Unsupervised Learning

- Organize computing clusters
- Social network analysis
- Market segmentation
- Astronomical data analysis


Cocktail party problem

Speaker1                    Microphone1




Speaker2                     Microphone2


[W,s,v] = svd((repmat(sum(x.*x,1),size(x,1),1).*x)*x');


Of the following examples, which would you address using an unsupervised learning algorithm?(Check all that apply.)

- Given email labeled as spam/not spam, learn a spam filter.

- Given a set of news articles found on the web, group them into set of articles about the same story.


- Give a database of customer data, automatically discover market segments and group customers into different market segments.

- Give a dataset of patients diagnosed as either having diabetes or not, learn to classify new patients as having diabetes or not.