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[yul-phaser] Population: Make ordering of individuals with same fitness deterministic and prioritise shorter chromosomes

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- Before this change the order of chromosomes with the same fitness in a population depended on the initial order set when the population was first created. Now it only depends on the individual.
- The length comparison is not strictly necessary (lexicographical order covers that) but it makes the intention clear and the comparison slightly faster when chromosomes have different lengths.
This commit is contained in:
Kamil Śliwak
2020-02-18 19:40:37 +01:00
parent 40a6669538
commit ecb30c670f
3 changed files with 23 additions and 2 deletions
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test/yulPhaser/Population.cpp
+12
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@@ -104,6 +104,18 @@ BOOST_AUTO_TEST_CASE(isFitter_should_use_fitness_as_the_main_criterion)
BOOST_TEST(!isFitter(Individual{Chromosome("aaa"), 10}, Individual{Chromosome("aaaaa"), 5}));
}
BOOST_AUTO_TEST_CASE(isFitter_should_use_alphabetical_order_when_fitness_is_the_same)
{
BOOST_TEST(isFitter(Individual{Chromosome("a"), 3}, Individual{Chromosome("c"), 3}));
BOOST_TEST(!isFitter(Individual{Chromosome("c"), 3}, Individual{Chromosome("a"), 3}));
BOOST_TEST(isFitter(Individual{Chromosome("a"), 3}, Individual{Chromosome("aa"), 3}));
BOOST_TEST(!isFitter(Individual{Chromosome("aa"), 3}, Individual{Chromosome("a"), 3}));
BOOST_TEST(isFitter(Individual{Chromosome("T"), 3}, Individual{Chromosome("a"), 3}));
BOOST_TEST(!isFitter(Individual{Chromosome("a"), 3}, Individual{Chromosome("T"), 3}));
}
BOOST_AUTO_TEST_CASE(isFitter_should_return_false_for_identical_individuals)
{
BOOST_TEST(!isFitter(Individual{Chromosome("a"), 3}, Individual{Chromosome("a"), 3}));