5b1715d97c
* add ellpack source * add batch param * extract function to parse cache info * construct ellpack info separately * push batch to ellpack page * write ellpack page. * make sparse page source reusable
119 lines
3.6 KiB
C++
119 lines
3.6 KiB
C++
/*!
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* Copyright (c) 2015 by Contributors
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* \file sparse_page_raw_format.cc
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* Raw binary format of sparse page.
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*/
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#include <xgboost/data.h>
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#include <dmlc/registry.h>
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#include "./sparse_page_writer.h"
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namespace xgboost {
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namespace data {
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DMLC_REGISTRY_FILE_TAG(sparse_page_raw_format);
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template<typename T>
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class SparsePageRawFormat : public SparsePageFormat<T> {
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public:
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bool Read(T* page, dmlc::SeekStream* fi) override {
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auto& offset_vec = page->offset.HostVector();
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if (!fi->Read(&offset_vec)) return false;
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auto& data_vec = page->data.HostVector();
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CHECK_NE(page->offset.Size(), 0U) << "Invalid SparsePage file";
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data_vec.resize(offset_vec.back());
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if (page->data.Size() != 0) {
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CHECK_EQ(fi->Read(dmlc::BeginPtr(data_vec),
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(page->data).Size() * sizeof(Entry)),
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(page->data).Size() * sizeof(Entry))
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<< "Invalid SparsePage file";
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}
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return true;
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}
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bool Read(T* page,
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dmlc::SeekStream* fi,
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const std::vector<bst_uint>& sorted_index_set) override {
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if (!fi->Read(&disk_offset_)) return false;
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auto& offset_vec = page->offset.HostVector();
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auto& data_vec = page->data.HostVector();
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// setup the offset
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offset_vec.clear();
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offset_vec.push_back(0);
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for (unsigned int fid : sorted_index_set) {
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CHECK_LT(fid + 1, disk_offset_.size());
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size_t size = disk_offset_[fid + 1] - disk_offset_[fid];
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offset_vec.push_back(offset_vec.back() + size);
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}
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data_vec.resize(offset_vec.back());
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// read in the data
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size_t begin = fi->Tell();
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size_t curr_offset = 0;
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for (size_t i = 0; i < sorted_index_set.size();) {
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bst_uint fid = sorted_index_set[i];
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if (disk_offset_[fid] != curr_offset) {
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CHECK_GT(disk_offset_[fid], curr_offset);
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fi->Seek(begin + disk_offset_[fid] * sizeof(Entry));
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curr_offset = disk_offset_[fid];
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}
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size_t j, size_to_read = 0;
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for (j = i; j < sorted_index_set.size(); ++j) {
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if (disk_offset_[sorted_index_set[j]] == disk_offset_[fid] + size_to_read) {
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size_to_read += offset_vec[j + 1] - offset_vec[j];
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} else {
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break;
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}
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}
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if (size_to_read != 0) {
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CHECK_EQ(fi->Read(dmlc::BeginPtr(data_vec) + offset_vec[i],
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size_to_read * sizeof(Entry)),
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size_to_read * sizeof(Entry))
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<< "Invalid SparsePage file";
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curr_offset += size_to_read;
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}
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i = j;
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}
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// seek to end of record
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if (curr_offset != disk_offset_.back()) {
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fi->Seek(begin + disk_offset_.back() * sizeof(Entry));
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}
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return true;
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}
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void Write(const T& page, dmlc::Stream* fo) override {
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const auto& offset_vec = page.offset.HostVector();
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const auto& data_vec = page.data.HostVector();
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CHECK(page.offset.Size() != 0 && offset_vec[0] == 0);
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CHECK_EQ(offset_vec.back(), page.data.Size());
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fo->Write(offset_vec);
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if (page.data.Size() != 0) {
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fo->Write(dmlc::BeginPtr(data_vec), page.data.Size() * sizeof(Entry));
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}
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}
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private:
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/*! \brief external memory column offset */
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std::vector<size_t> disk_offset_;
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};
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XGBOOST_REGISTER_SPARSE_PAGE_FORMAT(raw)
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.describe("Raw binary data format.")
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.set_body([]() {
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return new SparsePageRawFormat<SparsePage>();
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});
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XGBOOST_REGISTER_CSC_PAGE_FORMAT(raw)
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.describe("Raw binary data format.")
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.set_body([]() {
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return new SparsePageRawFormat<CSCPage>();
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});
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XGBOOST_REGISTER_SORTED_CSC_PAGE_FORMAT(raw)
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.describe("Raw binary data format.")
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.set_body([]() {
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return new SparsePageRawFormat<SortedCSCPage>();
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});
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} // namespace data
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} // namespace xgboost
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