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Check whether current updater can modify a tree. (#5406)

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* Check whether current updater can modify a tree.

* Fix tree model JSON IO for pruned trees.
This commit is contained in:
Jiaming Yuan
2020-03-14 09:24:08 +08:00
committed by GitHub
parent b745b7acce
commit ab7a46a1a4
8 changed files with 99 additions and 4 deletions
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19
tests/cpp/tree/test_tree_model.cc
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@@ -225,8 +225,6 @@ TEST(Tree, JsonIO) {
tree.ExpandNode(0, 0, 0.0f, false, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f);
Json j_tree{Object()};
tree.SaveModel(&j_tree);
std::stringstream ss;
Json::Dump(j_tree, &ss);
auto tparam = j_tree["tree_param"];
ASSERT_EQ(get<String>(tparam["num_feature"]), "0");
@@ -243,6 +241,23 @@ TEST(Tree, JsonIO) {
RegTree loaded_tree;
loaded_tree.LoadModel(j_tree);
ASSERT_EQ(loaded_tree.param.num_nodes, 3);
ASSERT_TRUE(loaded_tree == tree);
auto left = tree[0].LeftChild();
auto right = tree[0].RightChild();
tree.ExpandNode(left, 0, 0.0f, false, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f);
tree.ExpandNode(right, 0, 0.0f, false, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f);
tree.SaveModel(&j_tree);
tree.ChangeToLeaf(1, 1.0f);
ASSERT_EQ(tree[1].LeftChild(), -1);
ASSERT_EQ(tree[1].RightChild(), -1);
tree.SaveModel(&j_tree);
loaded_tree.LoadModel(j_tree);
ASSERT_EQ(loaded_tree[1].LeftChild(), -1);
ASSERT_EQ(loaded_tree[1].RightChild(), -1);
ASSERT_TRUE(tree.Equal(loaded_tree));
}
} // namespace xgboost