88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
// Copyright by Contributors
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#include <gtest/gtest.h>
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#include <xgboost/tree_model.h>
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#include "../helpers.h"
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#include "dmlc/filesystem.h"
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namespace xgboost {
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// Manually construct tree in binary format
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// Do not use structs in case they change
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// We want to preserve backwards compatibility
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TEST(Tree, Load) {
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dmlc::TemporaryDirectory tempdir;
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const std::string tmp_file = tempdir.path + "/tree.model";
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std::unique_ptr<dmlc::Stream> fo(dmlc::Stream::Create(tmp_file.c_str(), "w"));
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// Write params
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EXPECT_EQ(sizeof(TreeParam), (31 + 6) * sizeof(int));
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int num_roots = 1;
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int num_nodes = 2;
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int num_deleted = 0;
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int max_depth = 1;
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int num_feature = 0;
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int size_leaf_vector = 0;
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int reserved[31];
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fo->Write(&num_roots, sizeof(int));
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fo->Write(&num_nodes, sizeof(int));
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fo->Write(&num_deleted, sizeof(int));
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fo->Write(&max_depth, sizeof(int));
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fo->Write(&num_feature, sizeof(int));
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fo->Write(&size_leaf_vector, sizeof(int));
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fo->Write(reserved, sizeof(int) * 31);
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// Write 2 nodes
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EXPECT_EQ(sizeof(RegTree::Node),
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3 * sizeof(int) + 1 * sizeof(unsigned) + sizeof(float));
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int parent = -1;
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int cleft = 1;
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int cright = -1;
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unsigned sindex = 5;
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float split_or_weight = 0.5;
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fo->Write(&parent, sizeof(int));
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fo->Write(&cleft, sizeof(int));
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fo->Write(&cright, sizeof(int));
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fo->Write(&sindex, sizeof(unsigned));
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fo->Write(&split_or_weight, sizeof(float));
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parent = 0;
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cleft = -1;
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cright = -1;
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sindex = 2;
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split_or_weight = 0.1;
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fo->Write(&parent, sizeof(int));
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fo->Write(&cleft, sizeof(int));
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fo->Write(&cright, sizeof(int));
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fo->Write(&sindex, sizeof(unsigned));
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fo->Write(&split_or_weight, sizeof(float));
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// Write 2x node stats
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EXPECT_EQ(sizeof(RTreeNodeStat), 3 * sizeof(float) + sizeof(int));
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bst_float loss_chg = 5.0;
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bst_float sum_hess = 1.0;
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bst_float base_weight = 3.0;
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int leaf_child_cnt = 0;
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fo->Write(&loss_chg, sizeof(float));
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fo->Write(&sum_hess, sizeof(float));
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fo->Write(&base_weight, sizeof(float));
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fo->Write(&leaf_child_cnt, sizeof(int));
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loss_chg = 50.0;
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sum_hess = 10.0;
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base_weight = 30.0;
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leaf_child_cnt = 0;
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fo->Write(&loss_chg, sizeof(float));
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fo->Write(&sum_hess, sizeof(float));
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fo->Write(&base_weight, sizeof(float));
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fo->Write(&leaf_child_cnt, sizeof(int));
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fo.reset();
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std::unique_ptr<dmlc::Stream> fi(dmlc::Stream::Create(tmp_file.c_str(), "r"));
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xgboost::RegTree tree;
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tree.Load(fi.get());
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EXPECT_EQ(tree.GetDepth(1), 1);
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EXPECT_EQ(tree[0].SplitCond(), 0.5f);
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EXPECT_EQ(tree[0].SplitIndex(), 5);
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EXPECT_EQ(tree[1].LeafValue(), 0.1f);
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EXPECT_TRUE(tree[1].IsLeaf());
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}
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} // namespace xgboost
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