An Analysis of Migration Strategies in Island-Based Multimemetic Algorithms
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An Analysis of Migration Strategies in Island-Based Multimemetic Algorithms
Rafael Nogueras & Carlos Cotta
Memes are patterns-based rewriting rules [CàA]: • C, A ∈Σr with Σ={0,1,#}, r∈Ν
• ‘#’ represents a wildcard symbol
Meme à Unit of imitation
Encoded in computational representations (meme↔gene)
MMA
Very important
Meme Propagation
more complex
Replace-worst
Replace-random
Population Entropy
Meme Success Rate
m ς ωS ωR
Syn asyn
best rand
probabilistic diverse-gene diverse-meme
random-immigrants
replace-worst
replace-random
ωS
ωR
TRAP-128
HIFF-128
HXOR-128
SAT-128
µ=128 ni∈1,2,4,8 UniRing
m=1, ς=20
Friedman & Quade Tests
Holm Test
• Importance of migrant selection and migrant replacement • Replacement strategy has less impact than selection strategy • Strategies based on memetic diversity are better than genetic counterparts. • Probabilistic model is competitive with some migrations operators Future work: • More complex probabilistic model • Other self-adaptative memetic models
Let G=00010011, and let a meme be 01#à1#0:
PPSN 2014 Ljubljana, Slovenia
Memes Search Process
conduct Self-
adaptation ωR
ωS ↑↑
↓↓
MEME
Self-Adaptation in Search Process