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Topic models [3* P]

Apply topic models to a set of face images. Download and install the topic model toolbox of Mark Steyvers 4. A slim version without datasets can be found on the MLA webpage 5 (In case you use 64-bit MATLAB send me an email to get the correponding mex files for the toolbox). Modify the demo example 6 to apply topic models to a set of 900 face images7 of size $ 17 \times 17$ . Find an appropriate method to encode pixel value in word indices. Analyze what face topics are found after 2, 10 and 50 iterations using 5 and 20 topics. Interpret the results.



Haeusler Stefan 2010-01-26