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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/dom_distiller/core/distillable_page_detector.h"
#include <stddef.h>
#include <utility>
#include "base/check.h"
#include "components/grit/components_resources.h"
#include "ui/base/resource/resource_bundle.h"
namespace dom_distiller {
const DistillablePageDetector* DistillablePageDetector::GetNewModel() {
static DistillablePageDetector* detector = nullptr;
if (!detector) {
std::string serialized_proto =
ui::ResourceBundle::GetSharedInstance().LoadDataResourceString(
IDR_DISTILLABLE_PAGE_SERIALIZED_MODEL_NEW);
std::unique_ptr<AdaBoostProto> proto(new AdaBoostProto);
CHECK(proto->ParseFromString(serialized_proto));
detector = new DistillablePageDetector(std::move(proto));
}
return detector;
}
const DistillablePageDetector* DistillablePageDetector::GetLongPageModel() {
static DistillablePageDetector* detector = nullptr;
if (!detector) {
std::string serialized_proto =
ui::ResourceBundle::GetSharedInstance().LoadDataResourceString(
IDR_LONG_PAGE_SERIALIZED_MODEL);
std::unique_ptr<AdaBoostProto> proto(new AdaBoostProto);
CHECK(proto->ParseFromString(serialized_proto));
detector = new DistillablePageDetector(std::move(proto));
}
return detector;
}
DistillablePageDetector::DistillablePageDetector(
std::unique_ptr<AdaBoostProto> proto)
: proto_(std::move(proto)), threshold_(0.0) {
CHECK(proto_->num_stumps() == proto_->stump_size());
for (int i = 0; i < proto_->num_stumps(); ++i) {
const StumpProto& stump = proto_->stump(i);
CHECK(stump.feature_number() >= 0);
CHECK(stump.feature_number() < proto_->num_features());
threshold_ += stump.weight() / 2.0;
}
}
DistillablePageDetector::~DistillablePageDetector() = default;
bool DistillablePageDetector::Classify(
const std::vector<double>& features) const {
return Score(features) > threshold_;
}
double DistillablePageDetector::Score(
const std::vector<double>& features) const {
if (features.size() != size_t(proto_->num_features())) {
return 0.0;
}
double score = 0.0;
for (int i = 0; i < proto_->num_stumps(); ++i) {
const StumpProto& stump = proto_->stump(i);
if (features[stump.feature_number()] > stump.split()) {
score += stump.weight();
}
}
return score;
}
double DistillablePageDetector::GetThreshold() const {
return threshold_;
}
} // namespace dom_distiller
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