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Add more unit tests for dlib::rand

This commit is contained in:
Davis King 2022-02-03 08:44:57 -05:00
parent fc7595d081
commit fda984f7ca
1 changed files with 58 additions and 0 deletions
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58
dlib/test/rand.cpp
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@ -445,6 +445,62 @@ namespace
DLIB_TEST(std::abs(stats.skewness() - 2.0) < 0.01);
DLIB_TEST(std::abs(stats.ex_kurtosis() - 6.0) < 0.1);
}
void outputs_are_not_changed()
{
// dlib::rand has been around a really long time and it is a near certainty that there is
// client code that depends on dlib::rand yielding the exact random sequence it happens to
// yield for any given seed. So we test that the output values of dlib::rand are not
// changed in this test.
{
dlib::rand rnd;
std::vector<long> out;
for (int i = 0; i < 30; ++i) {
out.push_back(rnd.get_random_32bit_number());
}
const std::vector<long> expected = {
725333953,251387296,3200466189,2466988778,2049276419,2620437198,2806522923,
2922190659,4151412029,2894696296,1344442829,1165961100,328304965,1533685458,
3399102146,3995382051,1569312238,2353373514,2512982725,2903494783,787425157,
699798098,330364342,2870851082,659976556,1726343583,3551405331,3171822159,
1292599360,955731010};
DLIB_TEST(out == expected);
}
{
dlib::rand rnd;
rnd.set_seed("this seed");
std::vector<long> out;
for (int i = 0; i < 30; ++i) {
out.push_back(rnd.get_random_32bit_number());
}
const std::vector<long> expected = {
856663397,2356564049,1192662566,3478257893,1069117227,
1922448468,497418632,2504525324,987414451,769612124,77224022,2998161761,
1364481427,639342008,1778351952,1931573847,3213816676,3019312695,4179936779,
3637269252,4279821094,3738954922,3651625265,3159592157,333323775,4075800582,
4237631248,357468843,483435718,1255945812};
DLIB_TEST(out == expected);
}
{
dlib::rand rnd;
rnd.set_seed("some other seed");
std::vector<long> out;
for (int i = 0; i < 30; ++i) {
out.push_back(rnd.get_integer(1000));
}
const std::vector<long> expected = {
243,556,158,256,772,84,837,920,767,769,939,394,121,367,575,877,861,506,
451,845,870,638,825,516,327,25,646,373,386,227};
DLIB_TEST(out == expected);
}
}
class rand_tester : public tester
{
@ -459,6 +515,8 @@ namespace
)
{
dlog << LINFO << "testing kernel_1a";
outputs_are_not_changed();
rand_test<dlib::rand>();
rand_test<dlib::rand>();