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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/gtest/gtest.h>
#include <vespa/vespalib/util/random.h>
using namespace vespalib;
namespace {
constexpr double eps = 1.0e-9;
}
TEST(RandomTest, test_java_compatibility)
{
RandomGen rnd(1);
EXPECT_TRUE(rnd.nextInt32() == -1155869325);
EXPECT_TRUE(rnd.nextInt32() == 431529176);
EXPECT_TRUE(rnd.nextInt32() == 1761283695);
EXPECT_TRUE(rnd.nextInt32() == 1749940626);
EXPECT_TRUE(rnd.nextInt32() == 892128508);
EXPECT_TRUE(rnd.nextInt32() == 155629808);
EXPECT_TRUE(rnd.nextInt32() == 1429008869);
EXPECT_TRUE(rnd.nextInt32() == -1465154083);
EXPECT_TRUE(rnd.nextInt32() == -138487339);
EXPECT_TRUE(rnd.nextInt32() == -1242363800);
EXPECT_TRUE(rnd.nextInt32() == 26273138);
EXPECT_TRUE(rnd.nextInt32() == 655996946);
rnd.setSeed(1);
EXPECT_NEAR(rnd.nextDouble(), 0.7308781907032909, eps);
EXPECT_NEAR(rnd.nextDouble(), 0.41008081149220166, eps);
EXPECT_NEAR(rnd.nextDouble(), 0.20771484130971707, eps);
EXPECT_NEAR(rnd.nextDouble(), 0.3327170559595112, eps);
EXPECT_NEAR(rnd.nextDouble(), 0.9677559094241207, eps);
EXPECT_NEAR(rnd.nextDouble(), 0.006117182265761301, eps);
EXPECT_NEAR(rnd.nextDouble(), 0.9637047970232077, eps);
EXPECT_NEAR(rnd.nextDouble(), 0.9398653887819098, eps);
EXPECT_NEAR(rnd.nextDouble(), 0.9471949176631939, eps);
EXPECT_NEAR(rnd.nextDouble(), 0.9370821488959696, eps);
RandomGen rnd2(-1);
EXPECT_TRUE(rnd2.nextInt32() == 1155099827);
EXPECT_TRUE(rnd2.nextInt32() == 1887904451);
EXPECT_TRUE(rnd2.nextInt32() == 52699159);
rnd2.setSeed(-1);
EXPECT_TRUE(rnd2.nextInt32() == 1155099827);
EXPECT_TRUE(rnd2.nextInt32() == 1887904451);
EXPECT_TRUE(rnd2.nextInt32() == 52699159);
}
TEST(RandoMTest, test_floating_point)
{
RandomGen rnd;
int buckets[100];
for (int b = 0; b < 100; b++) {
buckets[b] = 0;
}
for (int i = 0; i < 100000; i++) {
double foo = rnd.nextDouble() * 100.0;
int b = (int)foo;
EXPECT_TRUE(b >= 0);
EXPECT_TRUE(b < 100);
if (b >= 0 && b < 100) ++buckets[b];
}
for (int b = 0; b < 100; b++) {
// note that it's *possible* for this to fail:
EXPECT_TRUE(buckets[b] > 800);
EXPECT_TRUE(buckets[b] < 1200);
// printf("bucket[%d] = %d\n", b, buckets[b]);
}
}
TEST(RandoMTest, test_normal_distribution)
{
RandomGen rnd;
int buckets[101];
for (int b = 0; b < 101; b++) {
buckets[b] = 0;
}
const int sum = 10000000;
int oor = 0;
for (int i = 0; i < sum; i++) {
double foo = rnd.nextNormal(50, 13);
int idx = (int)(foo+0.5);
if (foo < 0) {
++oor;
idx = 0;
}
if (foo > 100) {
++oor;
idx = 100;
}
buckets[idx]++;
}
EXPECT_TRUE(oor < 0.001 * sum);
printf("out of range of normal distribution: %d / %d\n", oor, sum);
printf("histogram in form:\nbucket\tnum\n>>> begin >>>\n");
for (int b = 0; b < 101; b++) {
printf("%d\t%d\n", b, buckets[b]);
}
printf("<<< end histogram <<<\n");
EXPECT_TRUE(buckets[50] > buckets[45]);
EXPECT_TRUE(buckets[45] > buckets[40]);
EXPECT_TRUE(buckets[40] > buckets[35]);
EXPECT_TRUE(buckets[35] > buckets[30]);
EXPECT_TRUE(buckets[30] > buckets[25]);
EXPECT_TRUE(buckets[25] > buckets[20]);
EXPECT_TRUE(buckets[20] > buckets[15]);
EXPECT_TRUE(buckets[15] > buckets[10]);
EXPECT_TRUE(buckets[10] > buckets[5]);
EXPECT_TRUE(buckets[5] > buckets[1]);
EXPECT_TRUE(buckets[50] > buckets[55]);
EXPECT_TRUE(buckets[55] > buckets[60]);
EXPECT_TRUE(buckets[60] > buckets[65]);
EXPECT_TRUE(buckets[65] > buckets[70]);
EXPECT_TRUE(buckets[70] > buckets[75]);
EXPECT_TRUE(buckets[75] > buckets[80]);
EXPECT_TRUE(buckets[80] > buckets[85]);
EXPECT_TRUE(buckets[85] > buckets[90]);
EXPECT_TRUE(buckets[90] > buckets[95]);
EXPECT_TRUE(buckets[95] > buckets[99]);
// not too fat tails:
EXPECT_TRUE(buckets[10] > buckets[0]);
EXPECT_TRUE(buckets[90] > buckets[100]);
}
GTEST_MAIN_RUN_ALL_TESTS()
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