Random projection ensemble classification

Add to your list(s) Download to your calendar using vCal

• Tim Cannings (University of Cambridge)
• Wednesday 18 November 2015, 16:00-17:00
• MR14, Centre for Mathematical Sciences.

If you have a question about this talk, please contact Adam Kashlak.

We introduce a very general method for high-dimensional classification, based on careful combination of the results of applying an arbitrary base classifier to random projections of the feature vectors into a lower-dimensional space. In one special case presented here, the random projections are divided into non-overlapping blocks, and within each block we select the projection yielding the smallest estimate of the test error. Our random projection ensemble classifier then aggregates the results of applying the base classifier on the selected projections, with a data-driven voting threshold to determine the final assignment. Our theoretical results elucidate the effect on performance of increasing the number of projections. Moreover, under a boundary condition implied by the sufficient dimension reduction assumption, we control the test excess risk of the random projection ensemble classifier. A simulation comparison with several other popular high-dimensional classifiers reveals its excellent finite-sample performance. This is joint work with Richard Samworth.

This talk is part of the Cambridge Analysts' Knowledge Exchange series.

This talk is included in these lists:

• All CMS events
• CMS Events
• Cambridge Analysts' Knowledge Exchange
• Cambridge Centre for Data-Driven Discovery (C2D3)
• Cambridge talks
• Chris Davis' list
• DAMTP info aggregator
• Interested Talks
• MR14, Centre for Mathematical Sciences
• My seminars
• Trust & Technology Initiative - interesting events
• bld31
• ndk22's list
• ob366-ai4er
• rp587

Note that ex-directory lists are not shown.