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xgboost/tests/cpp/common/test_quantile.cu
Jiaming Yuan 17fd3f55e9
Optimize adapter element counting on GPU. (#9209) 
- Implement a simple `IterSpan` for passing iterators with size.
- Use shared memory for column size counts.
- Use one thread for each sample in row count to reduce atomic operations.
2023-05-30 23:28:43 +08:00

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#include <gtest/gtest.h>
#include "test_quantile.h"
#include "../helpers.h"
#include "../../../src/collective/device_communicator.cuh"
#include "../../../src/common/hist_util.cuh"
#include "../../../src/common/quantile.cuh"
namespace xgboost {
namespace {
struct IsSorted {
XGBOOST_DEVICE bool operator()(common::SketchEntry const& a, common::SketchEntry const& b) const {
return a.value < b.value;
}
};
}
namespace common {
TEST(GPUQuantile, Basic) {
constexpr size_t kRows = 1000, kCols = 100, kBins = 256;
HostDeviceVector<FeatureType> ft;
SketchContainer sketch(ft, kBins, kCols, kRows, 0);
dh::caching_device_vector<Entry> entries;
dh::device_vector<bst_row_t> cuts_ptr(kCols+1);
thrust::fill(cuts_ptr.begin(), cuts_ptr.end(), 0);
// Push empty
sketch.Push(dh::ToSpan(entries), dh::ToSpan(cuts_ptr), dh::ToSpan(cuts_ptr), 0);
ASSERT_EQ(sketch.Data().size(), 0);
}
void TestSketchUnique(float sparsity) {
constexpr size_t kRows = 1000, kCols = 100;
RunWithSeedsAndBins(kRows, [kRows, kCols, sparsity](int32_t seed, size_t n_bins, MetaInfo const& info) {
HostDeviceVector<FeatureType> ft;
SketchContainer sketch(ft, n_bins, kCols, kRows, 0);
HostDeviceVector<float> storage;
std::string interface_str = RandomDataGenerator{kRows, kCols, sparsity}
.Seed(seed)
.Device(0)
.GenerateArrayInterface(&storage);
data::CupyAdapter adapter(interface_str);
AdapterDeviceSketch(adapter.Value(), n_bins, info,
std::numeric_limits<float>::quiet_NaN(), &sketch);
auto n_cuts = detail::RequiredSampleCutsPerColumn(n_bins, kRows);
dh::caching_device_vector<size_t> column_sizes_scan;
HostDeviceVector<size_t> cut_sizes_scan;
auto batch = adapter.Value();
data::IsValidFunctor is_valid(std::numeric_limits<float>::quiet_NaN());
auto batch_iter = dh::MakeTransformIterator<data::COOTuple>(
thrust::make_counting_iterator(0llu),
[=] __device__(size_t idx) { return batch.GetElement(idx); });
auto end = kCols * kRows;
detail::GetColumnSizesScan(0, kCols, n_cuts, IterSpan{batch_iter, end}, is_valid,
&cut_sizes_scan, &column_sizes_scan);
auto const& cut_sizes = cut_sizes_scan.HostVector();
ASSERT_LE(sketch.Data().size(), cut_sizes.back());
std::vector<size_t> h_columns_ptr(sketch.ColumnsPtr().size());
dh::CopyDeviceSpanToVector(&h_columns_ptr, sketch.ColumnsPtr());
ASSERT_EQ(sketch.Data().size(), h_columns_ptr.back());
sketch.Unique();
std::vector<SketchEntry> h_data(sketch.Data().size());
thrust::copy(dh::tcbegin(sketch.Data()), dh::tcend(sketch.Data()), h_data.begin());
for (size_t i = 1; i < h_columns_ptr.size(); ++i) {
auto begin = h_columns_ptr[i - 1];
auto column = common::Span<SketchEntry>(h_data).subspan(begin, h_columns_ptr[i] - begin);
ASSERT_TRUE(std::is_sorted(column.begin(), column.end(), IsSorted{}));
}
});
}
TEST(GPUQuantile, Unique) {
TestSketchUnique(0);
TestSketchUnique(0.5);
}
// if with_error is true, the test tolerates floating point error
void TestQuantileElemRank(int32_t device, Span<SketchEntry const> in,
Span<bst_row_t const> d_columns_ptr, bool with_error = false) {
dh::safe_cuda(cudaSetDevice(device));
std::vector<SketchEntry> h_in(in.size());
dh::CopyDeviceSpanToVector(&h_in, in);
std::vector<bst_row_t> h_columns_ptr(d_columns_ptr.size());
dh::CopyDeviceSpanToVector(&h_columns_ptr, d_columns_ptr);
for (size_t i = 1; i < d_columns_ptr.size(); ++i) {
auto column_id = i - 1;
auto beg = h_columns_ptr[column_id];
auto end = h_columns_ptr[i];
auto in_column = Span<SketchEntry>{h_in}.subspan(beg, end - beg);
for (size_t idx = 1; idx < in_column.size(); ++idx) {
float prev_rmin = in_column[idx - 1].rmin;
float prev_rmax = in_column[idx - 1].rmax;
float rmin_next = in_column[idx].RMinNext();
if (with_error) {
ASSERT_GE(in_column[idx].rmin + in_column[idx].rmin * kRtEps,
prev_rmin);
ASSERT_GE(in_column[idx].rmax + in_column[idx].rmin * kRtEps, prev_rmax);
ASSERT_GE(in_column[idx].rmax + in_column[idx].rmin * kRtEps,
rmin_next);
} else {
ASSERT_GE(in_column[idx].rmin, prev_rmin);
ASSERT_GE(in_column[idx].rmax, prev_rmax);
ASSERT_GE(in_column[idx].rmax, rmin_next);
}
}
}
}
TEST(GPUQuantile, Prune) {
constexpr size_t kRows = 1000, kCols = 100;
RunWithSeedsAndBins(kRows, [=](int32_t seed, size_t n_bins, MetaInfo const& info) {
HostDeviceVector<FeatureType> ft;
SketchContainer sketch(ft, n_bins, kCols, kRows, 0);
HostDeviceVector<float> storage;
std::string interface_str = RandomDataGenerator{kRows, kCols, 0}
.Device(0)
.Seed(seed)
.GenerateArrayInterface(&storage);
data::CupyAdapter adapter(interface_str);
AdapterDeviceSketch(adapter.Value(), n_bins, info,
std::numeric_limits<float>::quiet_NaN(), &sketch);
auto n_cuts = detail::RequiredSampleCutsPerColumn(n_bins, kRows);
// LE because kRows * kCols is pushed into sketch, after removing
// duplicated entries we might not have that much inputs for prune.
ASSERT_LE(sketch.Data().size(), n_cuts * kCols);
sketch.Prune(n_bins);
ASSERT_LE(sketch.Data().size(), kRows * kCols);
// This is not necessarily true for all inputs without calling unique after
// prune.
ASSERT_TRUE(thrust::is_sorted(thrust::device, sketch.Data().data(),
sketch.Data().data() + sketch.Data().size(),
detail::SketchUnique{}));
TestQuantileElemRank(0, sketch.Data(), sketch.ColumnsPtr());
});
}
TEST(GPUQuantile, MergeEmpty) {
constexpr size_t kRows = 1000, kCols = 100;
size_t n_bins = 10;
HostDeviceVector<FeatureType> ft;
SketchContainer sketch_0(ft, n_bins, kCols, kRows, 0);
HostDeviceVector<float> storage_0;
std::string interface_str_0 =
RandomDataGenerator{kRows, kCols, 0}.Device(0).GenerateArrayInterface(
&storage_0);
data::CupyAdapter adapter_0(interface_str_0);
MetaInfo info;
AdapterDeviceSketch(adapter_0.Value(), n_bins, info,
std::numeric_limits<float>::quiet_NaN(), &sketch_0);
std::vector<SketchEntry> entries_before(sketch_0.Data().size());
dh::CopyDeviceSpanToVector(&entries_before, sketch_0.Data());
std::vector<bst_row_t> ptrs_before(sketch_0.ColumnsPtr().size());
dh::CopyDeviceSpanToVector(&ptrs_before, sketch_0.ColumnsPtr());
thrust::device_vector<size_t> columns_ptr(kCols + 1);
// Merge an empty sketch
sketch_0.Merge(dh::ToSpan(columns_ptr), Span<SketchEntry>{});
std::vector<SketchEntry> entries_after(sketch_0.Data().size());
dh::CopyDeviceSpanToVector(&entries_after, sketch_0.Data());
std::vector<bst_row_t> ptrs_after(sketch_0.ColumnsPtr().size());
dh::CopyDeviceSpanToVector(&ptrs_after, sketch_0.ColumnsPtr());
CHECK_EQ(entries_before.size(), entries_after.size());
CHECK_EQ(ptrs_before.size(), ptrs_after.size());
for (size_t i = 0; i < entries_before.size(); ++i) {
CHECK_EQ(entries_before[i].value, entries_after[i].value);
CHECK_EQ(entries_before[i].rmin, entries_after[i].rmin);
CHECK_EQ(entries_before[i].rmax, entries_after[i].rmax);
CHECK_EQ(entries_before[i].wmin, entries_after[i].wmin);
}
for (size_t i = 0; i < ptrs_before.size(); ++i) {
CHECK_EQ(ptrs_before[i], ptrs_after[i]);
}
}
TEST(GPUQuantile, MergeBasic) {
constexpr size_t kRows = 1000, kCols = 100;
RunWithSeedsAndBins(kRows, [=](int32_t seed, size_t n_bins, MetaInfo const &info) {
HostDeviceVector<FeatureType> ft;
SketchContainer sketch_0(ft, n_bins, kCols, kRows, 0);
HostDeviceVector<float> storage_0;
std::string interface_str_0 = RandomDataGenerator{kRows, kCols, 0}
.Device(0)
.Seed(seed)
.GenerateArrayInterface(&storage_0);
data::CupyAdapter adapter_0(interface_str_0);
AdapterDeviceSketch(adapter_0.Value(), n_bins, info,
std::numeric_limits<float>::quiet_NaN(), &sketch_0);
SketchContainer sketch_1(ft, n_bins, kCols, kRows * kRows, 0);
HostDeviceVector<float> storage_1;
std::string interface_str_1 = RandomDataGenerator{kRows, kCols, 0}
.Device(0)
.Seed(seed)
.GenerateArrayInterface(&storage_1);
data::CupyAdapter adapter_1(interface_str_1);
AdapterDeviceSketch(adapter_1.Value(), n_bins, info,
std::numeric_limits<float>::quiet_NaN(), &sketch_1);
size_t size_before_merge = sketch_0.Data().size();
sketch_0.Merge(sketch_1.ColumnsPtr(), sketch_1.Data());
if (info.weights_.Size() != 0) {
TestQuantileElemRank(0, sketch_0.Data(), sketch_0.ColumnsPtr(), true);
sketch_0.FixError();
TestQuantileElemRank(0, sketch_0.Data(), sketch_0.ColumnsPtr(), false);
} else {
TestQuantileElemRank(0, sketch_0.Data(), sketch_0.ColumnsPtr());
}
auto columns_ptr = sketch_0.ColumnsPtr();
std::vector<bst_row_t> h_columns_ptr(columns_ptr.size());
dh::CopyDeviceSpanToVector(&h_columns_ptr, columns_ptr);
ASSERT_EQ(h_columns_ptr.back(), sketch_1.Data().size() + size_before_merge);
sketch_0.Unique();
ASSERT_TRUE(
thrust::is_sorted(thrust::device, sketch_0.Data().data(),
sketch_0.Data().data() + sketch_0.Data().size(),
detail::SketchUnique{}));
});
}
void TestMergeDuplicated(int32_t n_bins, size_t cols, size_t rows, float frac) {
MetaInfo info;
int32_t seed = 0;
HostDeviceVector<FeatureType> ft;
SketchContainer sketch_0(ft, n_bins, cols, rows, 0);
HostDeviceVector<float> storage_0;
std::string interface_str_0 = RandomDataGenerator{rows, cols, 0}
.Device(0)
.Seed(seed)
.GenerateArrayInterface(&storage_0);
data::CupyAdapter adapter_0(interface_str_0);
AdapterDeviceSketch(adapter_0.Value(), n_bins, info,
std::numeric_limits<float>::quiet_NaN(),
&sketch_0);
size_t f_rows = rows * frac;
SketchContainer sketch_1(ft, n_bins, cols, f_rows, 0);
HostDeviceVector<float> storage_1;
std::string interface_str_1 = RandomDataGenerator{f_rows, cols, 0}
.Device(0)
.Seed(seed)
.GenerateArrayInterface(&storage_1);
auto data_1 = storage_1.DeviceSpan();
auto tuple_it = thrust::make_tuple(
thrust::make_counting_iterator<size_t>(0ul), data_1.data());
using Tuple = thrust::tuple<size_t, float>;
auto it = thrust::make_zip_iterator(tuple_it);
thrust::transform(thrust::device, it, it + data_1.size(), data_1.data(),
[=] __device__(Tuple const &tuple) {
auto i = thrust::get<0>(tuple);
if (thrust::get<0>(tuple) % 2 == 0) {
return 0.0f;
} else {
return thrust::get<1>(tuple);
}
});
data::CupyAdapter adapter_1(interface_str_1);
AdapterDeviceSketch(adapter_1.Value(), n_bins, info,
std::numeric_limits<float>::quiet_NaN(),
&sketch_1);
size_t size_before_merge = sketch_0.Data().size();
sketch_0.Merge(sketch_1.ColumnsPtr(), sketch_1.Data());
TestQuantileElemRank(0, sketch_0.Data(), sketch_0.ColumnsPtr());
auto columns_ptr = sketch_0.ColumnsPtr();
std::vector<bst_row_t> h_columns_ptr(columns_ptr.size());
dh::CopyDeviceSpanToVector(&h_columns_ptr, columns_ptr);
ASSERT_EQ(h_columns_ptr.back(), sketch_1.Data().size() + size_before_merge);
sketch_0.Unique();
columns_ptr = sketch_0.ColumnsPtr();
dh::CopyDeviceSpanToVector(&h_columns_ptr, columns_ptr);
std::vector<SketchEntry> h_data(sketch_0.Data().size());
dh::CopyDeviceSpanToVector(&h_data, sketch_0.Data());
for (size_t i = 1; i < h_columns_ptr.size(); ++i) {
auto begin = h_columns_ptr[i - 1];
auto column = Span<SketchEntry> {h_data}.subspan(begin, h_columns_ptr[i] - begin);
ASSERT_TRUE(std::is_sorted(column.begin(), column.end(), IsSorted{}));
}
}
TEST(GPUQuantile, MergeDuplicated) {
size_t n_bins = 256;
constexpr size_t kRows = 1000, kCols = 100;
for (float frac = 0.5; frac < 2.5; frac += 0.5) {
TestMergeDuplicated(n_bins, kRows, kCols, frac);
}
}
TEST(GPUQuantile, MultiMerge) {
constexpr size_t kRows = 20, kCols = 1;
int32_t world = 2;
RunWithSeedsAndBins(kRows, [=](int32_t seed, size_t n_bins,
MetaInfo const &info) {
// Set up single node version
HostDeviceVector<FeatureType> ft;
SketchContainer sketch_on_single_node(ft, n_bins, kCols, kRows, 0);
size_t intermediate_num_cuts = std::min(
kRows * world, static_cast<size_t>(n_bins * WQSketch::kFactor));
std::vector<SketchContainer> containers;
for (auto rank = 0; rank < world; ++rank) {
HostDeviceVector<float> storage;
std::string interface_str = RandomDataGenerator{kRows, kCols, 0}
.Device(0)
.Seed(rank + seed)
.GenerateArrayInterface(&storage);
data::CupyAdapter adapter(interface_str);
HostDeviceVector<FeatureType> ft;
containers.emplace_back(ft, n_bins, kCols, kRows, 0);
AdapterDeviceSketch(adapter.Value(), n_bins, info,
std::numeric_limits<float>::quiet_NaN(),
&containers.back());
}
for (auto &sketch : containers) {
sketch.Prune(intermediate_num_cuts);
sketch_on_single_node.Merge(sketch.ColumnsPtr(), sketch.Data());
sketch_on_single_node.FixError();
}
TestQuantileElemRank(0, sketch_on_single_node.Data(),
sketch_on_single_node.ColumnsPtr());
sketch_on_single_node.Unique();
TestQuantileElemRank(0, sketch_on_single_node.Data(),
sketch_on_single_node.ColumnsPtr());
});
}
namespace {
void TestAllReduceBasic(int32_t n_gpus) {
auto const world = collective::GetWorldSize();
CHECK_EQ(world, n_gpus);
constexpr size_t kRows = 1000, kCols = 100;
RunWithSeedsAndBins(kRows, [=](int32_t seed, size_t n_bins, MetaInfo const& info) {
auto const device = collective::GetRank();
// Set up single node version;
HostDeviceVector<FeatureType> ft({}, device);
SketchContainer sketch_on_single_node(ft, n_bins, kCols, kRows, device);
size_t intermediate_num_cuts = std::min(
kRows * world, static_cast<size_t>(n_bins * WQSketch::kFactor));
std::vector<SketchContainer> containers;
for (auto rank = 0; rank < world; ++rank) {
HostDeviceVector<float> storage({}, device);
std::string interface_str = RandomDataGenerator{kRows, kCols, 0}
.Device(device)
.Seed(rank + seed)
.GenerateArrayInterface(&storage);
data::CupyAdapter adapter(interface_str);
HostDeviceVector<FeatureType> ft({}, device);
containers.emplace_back(ft, n_bins, kCols, kRows, device);
AdapterDeviceSketch(adapter.Value(), n_bins, info,
std::numeric_limits<float>::quiet_NaN(),
&containers.back());
}
for (auto &sketch : containers) {
sketch.Prune(intermediate_num_cuts);
sketch_on_single_node.Merge(sketch.ColumnsPtr(), sketch.Data());
sketch_on_single_node.FixError();
}
sketch_on_single_node.Unique();
TestQuantileElemRank(device, sketch_on_single_node.Data(),
sketch_on_single_node.ColumnsPtr(), true);
// Set up distributed version. We rely on using rank as seed to generate
// the exact same copy of data.
auto rank = collective::GetRank();
SketchContainer sketch_distributed(ft, n_bins, kCols, kRows, device);
HostDeviceVector<float> storage({}, device);
std::string interface_str = RandomDataGenerator{kRows, kCols, 0}
.Device(device)
.Seed(rank + seed)
.GenerateArrayInterface(&storage);
data::CupyAdapter adapter(interface_str);
AdapterDeviceSketch(adapter.Value(), n_bins, info,
std::numeric_limits<float>::quiet_NaN(),
&sketch_distributed);
sketch_distributed.AllReduce();
sketch_distributed.Unique();
ASSERT_EQ(sketch_distributed.ColumnsPtr().size(),
sketch_on_single_node.ColumnsPtr().size());
ASSERT_EQ(sketch_distributed.Data().size(),
sketch_on_single_node.Data().size());
TestQuantileElemRank(device, sketch_distributed.Data(),
sketch_distributed.ColumnsPtr(), true);
std::vector<SketchEntry> single_node_data(
sketch_on_single_node.Data().size());
dh::CopyDeviceSpanToVector(&single_node_data, sketch_on_single_node.Data());
std::vector<SketchEntry> distributed_data(sketch_distributed.Data().size());
dh::CopyDeviceSpanToVector(&distributed_data, sketch_distributed.Data());
float Eps = 2e-4 * world;
for (size_t i = 0; i < single_node_data.size(); ++i) {
ASSERT_NEAR(single_node_data[i].value, distributed_data[i].value, Eps);
ASSERT_NEAR(single_node_data[i].rmax, distributed_data[i].rmax, Eps);
ASSERT_NEAR(single_node_data[i].rmin, distributed_data[i].rmin, Eps);
ASSERT_NEAR(single_node_data[i].wmin, distributed_data[i].wmin, Eps);
}
});
}
} // anonymous namespace
TEST(GPUQuantile, MGPUAllReduceBasic) {
auto const n_gpus = AllVisibleGPUs();
if (n_gpus <= 1) {
GTEST_SKIP() << "Skipping MGPUAllReduceBasic test with # GPUs = " << n_gpus;
}
RunWithInMemoryCommunicator(n_gpus, TestAllReduceBasic, n_gpus);
}
namespace {
void TestSameOnAllWorkers(std::int32_t n_gpus) {
auto world = collective::GetWorldSize();
CHECK_EQ(world, n_gpus);
constexpr size_t kRows = 1000, kCols = 100;
RunWithSeedsAndBins(kRows, [=](int32_t seed, size_t n_bins,
MetaInfo const &info) {
auto const rank = collective::GetRank();
auto const device = rank;
HostDeviceVector<FeatureType> ft({}, device);
SketchContainer sketch_distributed(ft, n_bins, kCols, kRows, device);
HostDeviceVector<float> storage({}, device);
std::string interface_str = RandomDataGenerator{kRows, kCols, 0}
.Device(device)
.Seed(rank + seed)
.GenerateArrayInterface(&storage);
data::CupyAdapter adapter(interface_str);
AdapterDeviceSketch(adapter.Value(), n_bins, info,
std::numeric_limits<float>::quiet_NaN(),
&sketch_distributed);
sketch_distributed.AllReduce();
sketch_distributed.Unique();
TestQuantileElemRank(device, sketch_distributed.Data(), sketch_distributed.ColumnsPtr(), true);
// Test for all workers having the same sketch.
size_t n_data = sketch_distributed.Data().size();
collective::Allreduce<collective::Operation::kMax>(&n_data, 1);
ASSERT_EQ(n_data, sketch_distributed.Data().size());
size_t size_as_float =
sketch_distributed.Data().size_bytes() / sizeof(float);
auto local_data = Span<float const>{
reinterpret_cast<float const *>(sketch_distributed.Data().data()),
size_as_float};
dh::caching_device_vector<float> all_workers(size_as_float * world);
thrust::fill(all_workers.begin(), all_workers.end(), 0);
thrust::copy(thrust::device, local_data.data(),
local_data.data() + local_data.size(),
all_workers.begin() + local_data.size() * rank);
collective::DeviceCommunicator* communicator = collective::Communicator::GetDevice(device);
communicator->AllReduceSum(all_workers.data().get(), all_workers.size());
communicator->Synchronize();
auto base_line = dh::ToSpan(all_workers).subspan(0, size_as_float);
std::vector<float> h_base_line(base_line.size());
dh::CopyDeviceSpanToVector(&h_base_line, base_line);
size_t offset = 0;
for (decltype(world) i = 0; i < world; ++i) {
auto comp = dh::ToSpan(all_workers).subspan(offset, size_as_float);
std::vector<float> h_comp(comp.size());
dh::CopyDeviceSpanToVector(&h_comp, comp);
ASSERT_EQ(comp.size(), base_line.size());
for (size_t j = 0; j < h_comp.size(); ++j) {
ASSERT_NEAR(h_base_line[j], h_comp[j], kRtEps);
}
offset += size_as_float;
}
});
}
} // anonymous namespace
TEST(GPUQuantile, MGPUSameOnAllWorkers) {
auto const n_gpus = AllVisibleGPUs();
if (n_gpus <= 1) {
GTEST_SKIP() << "Skipping MGPUSameOnAllWorkers test with # GPUs = " << n_gpus;
}
RunWithInMemoryCommunicator(n_gpus, TestSameOnAllWorkers, n_gpus);
}
TEST(GPUQuantile, Push) {
size_t constexpr kRows = 100;
std::vector<float> data(kRows);
std::fill(data.begin(), data.begin() + (data.size() / 2), 0.3f);
std::fill(data.begin() + (data.size() / 2), data.end(), 0.5f);
int32_t n_bins = 128;
bst_feature_t constexpr kCols = 1;
std::vector<Entry> entries(kRows);
for (bst_feature_t i = 0; i < entries.size(); ++i) {
Entry e{i, data[i]};
entries[i] = e;
}
dh::device_vector<Entry> d_entries(entries);
dh::device_vector<size_t> columns_ptr(2);
columns_ptr[0] = 0;
columns_ptr[1] = kRows;
HostDeviceVector<FeatureType> ft;
SketchContainer sketch(ft, n_bins, kCols, kRows, 0);
sketch.Push(dh::ToSpan(d_entries), dh::ToSpan(columns_ptr), dh::ToSpan(columns_ptr), kRows, {});
auto sketch_data = sketch.Data();
thrust::host_vector<SketchEntry> h_sketch_data(sketch_data.size());
auto ptr = thrust::device_ptr<SketchEntry const>(sketch_data.data());
thrust::copy(ptr, ptr + sketch_data.size(), h_sketch_data.begin());
ASSERT_EQ(h_sketch_data.size(), 2);
auto v_0 = h_sketch_data[0];
ASSERT_EQ(v_0.rmin, 0);
ASSERT_EQ(v_0.wmin, kRows / 2.0f);
ASSERT_EQ(v_0.rmax, kRows / 2.0f);
auto v_1 = h_sketch_data[1];
ASSERT_EQ(v_1.rmin, kRows / 2.0f);
ASSERT_EQ(v_1.wmin, kRows / 2.0f);
ASSERT_EQ(v_1.rmax, static_cast<float>(kRows));
}
TEST(GPUQuantile, MultiColPush) {
size_t constexpr kRows = 100, kCols = 4;
std::vector<float> data(kRows * kCols);
std::fill(data.begin(), data.begin() + (data.size() / 2), 0.3f);
std::vector<Entry> entries(kRows * kCols);
for (bst_feature_t c = 0; c < kCols; ++c) {
for (size_t r = 0; r < kRows; ++r) {
float v = (r >= kRows / 2) ? 0.7 : 0.4;
auto e = Entry{c, v};
entries[c * kRows + r] = e;
}
}
int32_t n_bins = 16;
HostDeviceVector<FeatureType> ft;
SketchContainer sketch(ft, n_bins, kCols, kRows, 0);
dh::device_vector<Entry> d_entries {entries};
dh::device_vector<size_t> columns_ptr(kCols + 1, 0);
for (size_t i = 1; i < kCols + 1; ++i) {
columns_ptr[i] = kRows;
}
thrust::inclusive_scan(thrust::device, columns_ptr.begin(), columns_ptr.end(),
columns_ptr.begin());
dh::device_vector<size_t> cuts_ptr(columns_ptr);
sketch.Push(dh::ToSpan(d_entries), dh::ToSpan(columns_ptr),
dh::ToSpan(cuts_ptr), kRows * kCols, {});
auto sketch_data = sketch.Data();
ASSERT_EQ(sketch_data.size(), kCols * 2);
auto ptr = thrust::device_ptr<SketchEntry const>(sketch_data.data());
std::vector<SketchEntry> h_sketch_data(sketch_data.size());
thrust::copy(ptr, ptr + sketch_data.size(), h_sketch_data.begin());
for (size_t i = 0; i < kCols; ++i) {
auto v_0 = h_sketch_data[i * 2];
ASSERT_EQ(v_0.rmin, 0);
ASSERT_EQ(v_0.wmin, kRows / 2.0f);
ASSERT_EQ(v_0.rmax, kRows / 2.0f);
auto v_1 = h_sketch_data[i * 2 + 1];
ASSERT_EQ(v_1.rmin, kRows / 2.0f);
ASSERT_EQ(v_1.wmin, kRows / 2.0f);
ASSERT_EQ(v_1.rmax, static_cast<float>(kRows));
}
}
} // namespace common
} // namespace xgboost
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