12 DMLC_REGISTRY_FILE_TAG(quantize);
15 scan_thresholds(ASTNode* node,
16 std::vector<std::set<tl_float>>* cut_pts) {
17 NumericalConditionNode* num_cond;
18 CategoricalConditionNode* cat_cond;
19 if ( (num_cond = dynamic_cast<NumericalConditionNode*>(node)) ) {
20 CHECK(!num_cond->quantized) <<
"should not be already quantized";
21 const tl_float threshold = num_cond->threshold.float_val;
22 if (std::isfinite(threshold)) {
23 (*cut_pts)[num_cond->split_index].insert(threshold);
26 for (ASTNode* child : node->children) {
27 scan_thresholds(child, cut_pts);
32 rewrite_thresholds(ASTNode* node,
33 const std::vector<std::vector<tl_float>>& cut_pts) {
34 NumericalConditionNode* num_cond;
35 if ( (num_cond = dynamic_cast<NumericalConditionNode*>(node)) ) {
36 CHECK(!num_cond->quantized) <<
"should not be already quantized";
37 const tl_float threshold = num_cond->threshold.float_val;
38 if (std::isfinite(threshold)) {
39 const auto& v = cut_pts[num_cond->split_index];
40 auto loc = common::binary_search(v.begin(), v.end(), threshold);
41 CHECK(loc != v.end());
42 num_cond->threshold.int_val =
static_cast<size_t>(loc - v.begin()) * 2;
43 num_cond->quantized =
true;
46 for (ASTNode* child : node->children) {
47 rewrite_thresholds(child, cut_pts);
51 void ASTBuilder::QuantizeThresholds() {
52 this->quantize_threshold_flag =
true;
53 std::vector<std::set<tl_float>> cut_pts;
54 std::vector<std::vector<tl_float>> cut_pts_vec;
55 cut_pts.resize(this->num_feature);
56 cut_pts_vec.resize(this->num_feature);
57 scan_thresholds(this->main_node, &cut_pts);
59 for (
int i = 0; i < this->num_feature; ++i) {
60 std::copy(cut_pts[i].begin(), cut_pts[i].end(),
61 std::back_inserter(cut_pts_vec[i]));
65 rewrite_thresholds(this->main_node, cut_pts_vec);
67 CHECK_EQ(this->main_node->children.size(), 1);
68 ASTNode* top_ac_node = this->main_node->children[0];
69 CHECK(dynamic_cast<AccumulatorContextNode*>(top_ac_node));
73 ASTNode* quantizer_node = AddNode<QuantizerNode>(this->main_node,
74 std::move(cut_pts_vec));
75 quantizer_node->children.push_back(top_ac_node);
76 top_ac_node->parent = quantizer_node;
77 this->main_node->children[0] = quantizer_node;
double tl_float
float type to be used internally