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Optimisations for gpu_hist. (#4248)

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* Optimisations for gpu_hist.

* Use streams to overlap operations.

* ColumnSampler now uses HostDeviceVector to prevent repeatedly copying feature vectors to the device.
This commit is contained in:
Rory Mitchell
2019-03-20 13:30:06 +13:00
committed by GitHub
parent 7814183199
commit 00465d243d
8 changed files with 278 additions and 119 deletions
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24
tests/cpp/common/test_random.cc
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@@ -11,38 +11,40 @@ TEST(ColumnSampler, Test) {
// No node sampling
cs.Init(n, 1.0f, 0.5f, 0.5f);
auto set0 = *cs.GetFeatureSet(0);
ASSERT_EQ(set0.size(), 32);
ASSERT_EQ(set0.Size(), 32);
auto set1 = *cs.GetFeatureSet(0);
ASSERT_EQ(set0, set1);
ASSERT_EQ(set0.HostVector(), set1.HostVector());
auto set2 = *cs.GetFeatureSet(1);
ASSERT_NE(set1, set2);
ASSERT_EQ(set2.size(), 32);
ASSERT_NE(set1.HostVector(), set2.HostVector());
ASSERT_EQ(set2.Size(), 32);
// Node sampling
cs.Init(n, 0.5f, 1.0f, 0.5f);
auto set3 = *cs.GetFeatureSet(0);
ASSERT_EQ(set3.size(), 32);
ASSERT_EQ(set3.Size(), 32);
auto set4 = *cs.GetFeatureSet(0);
ASSERT_NE(set3, set4);
ASSERT_EQ(set4.size(), 32);
ASSERT_NE(set3.HostVector(), set4.HostVector());
ASSERT_EQ(set4.Size(), 32);
// No level or node sampling, should be the same at different depth
cs.Init(n, 1.0f, 1.0f, 0.5f);
ASSERT_EQ(*cs.GetFeatureSet(0), *cs.GetFeatureSet(1));
ASSERT_EQ(cs.GetFeatureSet(0)->HostVector(), cs.GetFeatureSet(1)->HostVector());
cs.Init(n, 1.0f, 1.0f, 1.0f);
auto set5 = *cs.GetFeatureSet(0);
ASSERT_EQ(set5.size(), n);
ASSERT_EQ(set5.Size(), n);
cs.Init(n, 1.0f, 1.0f, 1.0f);
auto set6 = *cs.GetFeatureSet(0);
ASSERT_EQ(set5, set6);
ASSERT_EQ(set5.HostVector(), set6.HostVector());
// Should always be a minimum of one feature
cs.Init(n, 1e-16f, 1e-16f, 1e-16f);
ASSERT_EQ(cs.GetFeatureSet(0)->size(), 1);
ASSERT_EQ(cs.GetFeatureSet(0)->Size(), 1);
}
} // namespace common