Created by W.Langdon from gp-bibliography.bib Revision:1.7325
We thus present 2Phase, a fitness function that also incorporates the output of test case failures, and compare it with ARJAe,that shares the same principles, and the standard fitness, that only takes the Boolean test case result into consideration. We conduct the comparison on 16 buggy programs from the QuixBugs benchmark using the Gin genetic improvement framework. The results show no significant difference in the performance of all three fitness functions considered. However, Gin was able to find 8 correct fixes, more than any of the APR tools in the recent QuixBugs study.",
cf video 2CbHQMhkMTU 11:17 A: due to QuixBugs, may be different results on different benchmarks. A2 (red) Future work more benchmarks and especially bigger faulty software, with possibly larger search spaces. More formal analysis of search space, cf search landscape of SBSE testing.
Q2: fitness diversity. A: different patches (of same example bug) should have different (numerical) fitness values. Low diversity means different patches have the same fitness. Without fitness diversity it is hard to guide the search for better patches.
Q3: would other types of diversity be better? A1(off screen, voice only): tried new operators. a2: Future work may be need new measures of diversity. A3(grey): We concentrate upon fitness diversity between patches to guide search. a2: Smooth the landscape so EC algorithm is better guided (to acceptable bug repair)
'test-suite adequate patches for 11 programs, with 8 being correct fixes (more than any of the APR tools in the recent QuixBugs study)'
checkpoints around numerical values in the source code as part of fitness distance calculation. Internal test oracles? But not used?
patch over fitting. EvoSuite hold out tests.
'The mutation operator either appends a random new edit to a patch or removes one from a non-empty patch. The crossover operator combines two parent solutions by concatenating, in both orders, the two sequences of edits before each edit is removed with 0.5 probability to create the two children patches.'
University College London, London, United Kingdom
Genetic Programming entries for Zhiqiang Bian Justyna Petke Aymeric Blot