22 March 2013

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Previous Meeting

Next Meeting

Present: Lee, Tom, Daniel (scribe), Kwaku.

Administrative

 * Jake may come and bring brevis into the group
 * Several people are expressing intrest to join the group in the near future

Future Work

 * GPTP chapter deadline is 5/30
 * needs update for new data
 * Add Jamie and Daniel's data to lexicase article
 * GPTP token to Tom
 * Lexicase and node selection are next for Tom
 * Discussion of what Daniel should be doing
 * weighted lexicase with previous algebra work
 * try to do push work with environments
 * do push for finite algrebra problems

GPSP

 * Lee has been communicating with Alberto Moraglio
 * Alberto has been learning Push and Clojure very quickly
 * He has been working on a system he thinks could solve a very difficult parity challenge
 * Anyone is welcome to help work on this

Selection

 * Lexicase selection seems to be demonstrably good in many cases
 * It is even good in non modal problems
 * Have looked at ways to improve lexicase selection
 * All previous attempts at improving lexicase have been bad

Niche Elite Selection

 * This is the system talked about in the previous meeting
 * This system seems to be truly terrible

Newest Proposed System

 * Instead of doing sorting of cases, sometimes can skip a case
 * Discussion when and why you skip
 * Decide want a low chance of skipping if case is unique
 * This calls for a similarity measure; we decide to use mutual information
 * Kwaku brings up this is a valuable metric about test cases in general
 * Decide the specialness of cases shouldn't be recomputed for smaller populations

Reading

 * There will be a discussion next meeting about the genetic improvement paper that has already been sent out to the list