42bf90eb8f
* Column sampling at individual nodes (splits). * Documented colsample_bynode parameter. - also updated documentation for colsample_by* parameters * Updated documentation. * GetFeatureSet() returns shared pointer to std::vector. * Sync sampled columns across multiple processes.
50 lines
1.2 KiB
C++
50 lines
1.2 KiB
C++
#include "../../../src/common/random.h"
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#include "../helpers.h"
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#include "gtest/gtest.h"
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namespace xgboost {
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namespace common {
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TEST(ColumnSampler, Test) {
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int n = 128;
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ColumnSampler cs;
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// No node sampling
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cs.Init(n, 1.0f, 0.5f, 0.5f);
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auto set0 = *cs.GetFeatureSet(0);
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ASSERT_EQ(set0.size(), 32);
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auto set1 = *cs.GetFeatureSet(0);
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ASSERT_EQ(set0, set1);
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auto set2 = *cs.GetFeatureSet(1);
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ASSERT_NE(set1, set2);
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ASSERT_EQ(set2.size(), 32);
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// Node sampling
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cs.Init(n, 0.5f, 1.0f, 0.5f);
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auto set3 = *cs.GetFeatureSet(0);
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ASSERT_EQ(set3.size(), 32);
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auto set4 = *cs.GetFeatureSet(0);
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ASSERT_NE(set3, set4);
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ASSERT_EQ(set4.size(), 32);
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// No level or node sampling, should be the same at different depth
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cs.Init(n, 1.0f, 1.0f, 0.5f);
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ASSERT_EQ(*cs.GetFeatureSet(0), *cs.GetFeatureSet(1));
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cs.Init(n, 1.0f, 1.0f, 1.0f);
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auto set5 = *cs.GetFeatureSet(0);
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ASSERT_EQ(set5.size(), n);
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cs.Init(n, 1.0f, 1.0f, 1.0f);
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auto set6 = *cs.GetFeatureSet(0);
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ASSERT_EQ(set5, set6);
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// Should always be a minimum of one feature
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cs.Init(n, 1e-16f, 1e-16f, 1e-16f);
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ASSERT_EQ(cs.GetFeatureSet(0)->size(), 1);
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}
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} // namespace common
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} // namespace xgboost
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