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Unify CPU hist sketching #5880

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merged 5 commits into from
Aug 11, 2020
Merged

Unify CPU hist sketching #5880

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a0ab2c8
Merge CPU sketching implementations.
trivialfis Jul 8, 2020
8587012
Reduce dask test search space.
trivialfis Aug 10, 2020
04f87fd
Revert "Reduce dask test search space."
trivialfis Aug 10, 2020
68e5169
Fixture.
trivialfis Aug 10, 2020
cf5528b
Logger.
trivialfis Aug 11, 2020
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1 change: 1 addition & 0 deletions amalgamation/xgboost-all0.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -70,6 +70,7 @@
#include "../src/common/common.cc"
#include "../src/common/charconv.cc"
#include "../src/common/timer.cc"
#include "../src/common/quantile.cc"
#include "../src/common/host_device_vector.cc"
#include "../src/common/hist_util.cc"
#include "../src/common/json.cc"
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20 changes: 20 additions & 0 deletions include/xgboost/data.h
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Expand Up @@ -239,6 +239,21 @@ struct BatchParam {
}
};

struct HostSparsePageView {
using Inst = common::Span<Entry const>;

common::Span<bst_row_t const> offset;
common::Span<Entry const> data;

Inst operator[](size_t i) const {
auto size = *(offset.data() + i + 1) - *(offset.data() + i);
return {data.data() + *(offset.data() + i),
static_cast<Inst::index_type>(size)};
}

size_t Size() const { return offset.size() == 0 ? 0 : offset.size() - 1; }
};

/*!
* \brief In-memory storage unit of sparse batch, stored in CSR format.
*/
Expand Down Expand Up @@ -270,6 +285,11 @@ class SparsePage {
static_cast<Inst::index_type>(size)};
}

HostSparsePageView GetView() const {
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Is there a way to fix operator[] instead of creating a whole new class?

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@RAMitchell If you want to call operator[] without first calling HostVector twice, then I don't think so.

return {offset.ConstHostSpan(), data.ConstHostSpan()};
}


/*! \brief constructor */
SparsePage() {
this->Clear();
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