d5992dd881
* Replaced std::vector-based interfaces with HostDeviceVector-based interfaces. - replacement was performed in the learner, boosters, predictors, updaters, and objective functions - only interfaces used in training were replaced; interfaces like PredictInstance() still use std::vector - refactoring necessary for replacement of interfaces was also performed, such as using HostDeviceVector in prediction cache * HostDeviceVector-based interfaces for custom objective function example plugin.
53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
/*!
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* Copyright 2014 by Contributors
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* \file updater_sync.cc
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* \brief synchronize the tree in all distributed nodes
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*/
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#include <xgboost/tree_updater.h>
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#include <vector>
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#include <string>
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#include <limits>
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#include "../common/sync.h"
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#include "../common/io.h"
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namespace xgboost {
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namespace tree {
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DMLC_REGISTRY_FILE_TAG(updater_sync);
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/*!
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* \brief syncher that synchronize the tree in all distributed nodes
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* can implement various strategies, so far it is always set to node 0's tree
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*/
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class TreeSyncher: public TreeUpdater {
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public:
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void Init(const std::vector<std::pair<std::string, std::string> >& args) override {}
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void Update(HostDeviceVector<bst_gpair> *gpair,
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DMatrix* dmat,
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const std::vector<RegTree*> &trees) override {
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if (rabit::GetWorldSize() == 1) return;
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std::string s_model;
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common::MemoryBufferStream fs(&s_model);
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int rank = rabit::GetRank();
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if (rank == 0) {
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for (size_t i = 0; i < trees.size(); ++i) {
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trees[i]->Save(&fs);
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}
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}
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fs.Seek(0);
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rabit::Broadcast(&s_model, 0);
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for (size_t i = 0; i < trees.size(); ++i) {
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trees[i]->Load(&fs);
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}
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}
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};
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XGBOOST_REGISTER_TREE_UPDATER(TreeSyncher, "sync")
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.describe("Syncher that synchronize the tree in all distributed nodes.")
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.set_body([]() {
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return new TreeSyncher();
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});
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} // namespace tree
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} // namespace xgboost
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