69 lines
2.1 KiB
C++
69 lines
2.1 KiB
C++
/*!
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* Copyright 2017-2024 by Contributors
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* \file hist_synchronizer.h
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*/
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#ifndef PLUGIN_SYCL_TREE_HIST_SYNCHRONIZER_H_
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#define PLUGIN_SYCL_TREE_HIST_SYNCHRONIZER_H_
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#include <vector>
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#include "../common/hist_util.h"
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#include "expand_entry.h"
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namespace xgboost {
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namespace sycl {
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namespace tree {
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template <typename GradientSumT>
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class HistUpdater;
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template <typename GradientSumT>
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class HistSynchronizer {
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public:
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virtual void SyncHistograms(HistUpdater<GradientSumT>* builder,
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const std::vector<int>& sync_ids,
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RegTree *p_tree) = 0;
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virtual ~HistSynchronizer() = default;
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};
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template <typename GradientSumT>
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class BatchHistSynchronizer: public HistSynchronizer<GradientSumT> {
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public:
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void SyncHistograms(HistUpdater<GradientSumT>* builder,
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const std::vector<int>& sync_ids,
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RegTree *p_tree) override {
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builder->builder_monitor_.Start("SyncHistograms");
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const size_t nbins = builder->hist_builder_.GetNumBins();
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hist_sync_events_.resize(builder->nodes_for_explicit_hist_build_.size());
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for (int i = 0; i < builder->nodes_for_explicit_hist_build_.size(); i++) {
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const auto entry = builder->nodes_for_explicit_hist_build_[i];
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auto& this_hist = builder->hist_[entry.nid];
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if (!(*p_tree)[entry.nid].IsRoot()) {
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const size_t parent_id = (*p_tree)[entry.nid].Parent();
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auto& parent_hist = builder->hist_[parent_id];
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auto& sibling_hist = builder->hist_[entry.GetSiblingId(p_tree, parent_id)];
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hist_sync_events_[i] = common::SubtractionHist(builder->qu_, &sibling_hist, parent_hist,
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this_hist, nbins, ::sycl::event());
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}
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}
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builder->qu_.wait_and_throw();
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builder->builder_monitor_.Stop("SyncHistograms");
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}
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std::vector<::sycl::event> GetEvents() const {
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return hist_sync_events_;
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}
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private:
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std::vector<::sycl::event> hist_sync_events_;
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};
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} // namespace tree
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} // namespace sycl
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} // namespace xgboost
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#endif // PLUGIN_SYCL_TREE_HIST_SYNCHRONIZER_H_
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