In this exercise we consider the problem of

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: lumns of matrices X and Y, respectively. Find the thickness of the maximum thickness separating slab. Solve the problem above for 100 or so values of λ over an appropriate range (we recommend log spacing). For each value, 63 record the separation slab thickness 2/ a 2 and card(a), the cardinality of a (i.e., the number of nonzero entries). In computing the cardinality, you can count an entry aj of a as zero if it satisfies |aj | ≤ 10−4 . Plot these data with slab thickness on the vertical axis and cardinality on the horizontal axis. Use this data to choose a set of 10 features out of the 50 in the data. Give the indices of the features you choose. You may have several choices of sets of features here; you can just choose one. Then find the maximum thickness separating slab that uses only the chosen features. (This is standard practice: once you’ve chosen the features you’re going to use, you optimize again, using only those features, and without the ℓ1 regularization. 7.7 Th...
View Full Document

This note was uploaded on 09/10/2013 for the course C 231 taught by Professor F.borrelli during the Fall '13 term at Berkeley.

Ask a homework question - tutors are online