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Categorical data support in CPU sketching. (#7221)

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This commit is contained in:
Jiaming Yuan
2021-09-17 04:37:09 +08:00
committed by GitHub
parent 9f63d6fead
commit 31c1e13f90
7 changed files with 129 additions and 57 deletions
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3
src/common/hist_util.h
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@@ -1,5 +1,5 @@
/*!
* Copyright 2017-2020 by Contributors
* Copyright 2017-2021 by Contributors
* \file hist_util.h
* \brief Utility for fast histogram aggregation
* \author Philip Cho, Tianqi Chen
@@ -128,6 +128,7 @@ inline HistogramCuts SketchOnDMatrix(DMatrix *m, int32_t max_bins,
}
}
HostSketchContainer container(reduced, max_bins,
m->Info().feature_types.ConstHostSpan(),
HostSketchContainer::UseGroup(info), threads);
for (auto const &page : m->GetBatches<SparsePage>()) {
container.PushRowPage(page, info, hessian);

60
src/common/quantile.cc
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@@ -1,29 +1,35 @@
/*!
* Copyright 2020 by XGBoost Contributors
* Copyright 2020-2021 by XGBoost Contributors
*/
#include <limits>
#include <utility>
#include "quantile.h"
#include "hist_util.h"
#include "categorical.h"
namespace xgboost {
namespace common {
HostSketchContainer::HostSketchContainer(std::vector<bst_row_t> columns_size,
int32_t max_bins, bool use_group,
int32_t n_threads)
: columns_size_{std::move(columns_size)}, max_bins_{max_bins},
HostSketchContainer::HostSketchContainer(
std::vector<bst_row_t> columns_size, int32_t max_bins,
common::Span<FeatureType const> feature_types, bool use_group,
int32_t n_threads)
: feature_types_(feature_types.cbegin(), feature_types.cend()),
columns_size_{std::move(columns_size)}, max_bins_{max_bins},
use_group_ind_{use_group}, n_threads_{n_threads} {
monitor_.Init(__func__);
CHECK_NE(columns_size_.size(), 0);
sketches_.resize(columns_size_.size());
CHECK_GE(n_threads_, 1);
categories_.resize(columns_size_.size());
ParallelFor(sketches_.size(), n_threads_, Sched::Auto(), [&](auto i) {
auto n_bins = std::min(static_cast<size_t>(max_bins_), columns_size_[i]);
n_bins = std::max(n_bins, static_cast<decltype(n_bins)>(1));
auto eps = 1.0 / (static_cast<float>(n_bins) * WQSketch::kFactor);
sketches_[i].Init(columns_size_[i], eps);
sketches_[i].inqueue.queue.resize(sketches_[i].limit_size * 2);
if (!IsCat(this->feature_types_, i)) {
sketches_[i].Init(columns_size_[i], eps);
sketches_[i].inqueue.queue.resize(sketches_[i].limit_size * 2);
}
});
}
@@ -182,13 +188,21 @@ void HostSketchContainer::PushRowPage(
auto p_inst = inst.data();
if (is_dense) {
for (size_t ii = begin; ii < end; ii++) {
sketches_[ii].Push(p_inst[ii].fvalue, w);
if (IsCat(feature_types_, ii)) {
categories_[ii].emplace(p_inst[ii].fvalue);
} else {
sketches_[ii].Push(p_inst[ii].fvalue, w);
}
}
} else {
for (size_t i = 0; i < inst.size(); ++i) {
auto const& entry = p_inst[i];
if (entry.index >= begin && entry.index < end) {
sketches_[entry.index].Push(entry.fvalue, w);
if (IsCat(feature_types_, entry.index)) {
categories_[entry.index].emplace(entry.fvalue);
} else {
sketches_[entry.index].Push(entry.fvalue, w);
}
}
}
}
@@ -338,6 +352,13 @@ void AddCutPoint(WQuantileSketch<float, float>::SummaryContainer const &summary,
}
}
void AddCategories(std::set<bst_cat_t> const &categories, HistogramCuts *cuts) {
auto &cut_values = cuts->cut_values_.HostVector();
for (auto const &v : categories) {
cut_values.push_back(v);
}
}
void HostSketchContainer::MakeCuts(HistogramCuts* cuts) {
monitor_.Start(__func__);
std::vector<WQSketch::SummaryContainer> reduced;
@@ -348,6 +369,9 @@ void HostSketchContainer::MakeCuts(HistogramCuts* cuts) {
std::vector<WQSketch::SummaryContainer> final_summaries(reduced.size());
ParallelFor(reduced.size(), n_threads_, Sched::Guided(), [&](size_t fidx) {
if (IsCat(feature_types_, fidx)) {
return;
}
WQSketch::SummaryContainer &a = final_summaries[fidx];
size_t max_num_bins = std::min(num_cuts[fidx], max_bins_);
a.Reserve(max_num_bins + 1);
@@ -367,13 +391,17 @@ void HostSketchContainer::MakeCuts(HistogramCuts* cuts) {
for (size_t fid = 0; fid < reduced.size(); ++fid) {
size_t max_num_bins = std::min(num_cuts[fid], max_bins_);
WQSketch::SummaryContainer const& a = final_summaries[fid];
AddCutPoint(a, max_num_bins, cuts);
// push a value that is greater than anything
const bst_float cpt
= (a.size > 0) ? a.data[a.size - 1].value : cuts->min_vals_.HostVector()[fid];
// this must be bigger than last value in a scale
const bst_float last = cpt + (fabs(cpt) + 1e-5f);
cuts->cut_values_.HostVector().push_back(last);
if (IsCat(feature_types_, fid)) {
AddCategories(categories_.at(fid), cuts);
} else {
AddCutPoint(a, max_num_bins, cuts);
// push a value that is greater than anything
const bst_float cpt = (a.size > 0) ? a.data[a.size - 1].value
: cuts->min_vals_.HostVector()[fid];
// this must be bigger than last value in a scale
const bst_float last = cpt + (fabs(cpt) + 1e-5f);
cuts->cut_values_.HostVector().push_back(last);
}
// Ensure that every feature gets at least one quantile point
CHECK_LE(cuts->cut_values_.HostVector().size(), std::numeric_limits<uint32_t>::max());

9
src/common/quantile.h
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@@ -1,5 +1,5 @@
/*!
* Copyright 2014 by Contributors
* Copyright 2014-2021 by Contributors
* \file quantile.h
* \brief util to compute quantiles
* \author Tianqi Chen
@@ -15,6 +15,7 @@
#include <cstring>
#include <algorithm>
#include <iostream>
#include <set>
#include "timer.h"
@@ -707,6 +708,9 @@ class HostSketchContainer {
private:
std::vector<WQSketch> sketches_;
std::vector<std::set<bst_cat_t>> categories_;
std::vector<FeatureType> const feature_types_;
std::vector<bst_row_t> columns_size_;
int32_t max_bins_;
bool use_group_ind_{false};
@@ -721,7 +725,8 @@ class HostSketchContainer {
* \param use_group whether is assigned to group to data instance.
*/
HostSketchContainer(std::vector<bst_row_t> columns_size, int32_t max_bins,
bool use_group, int32_t n_threads);
common::Span<FeatureType const> feature_types, bool use_group,
int32_t n_threads);
static bool UseGroup(MetaInfo const &info) {
size_t const num_groups =