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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/navigation_predictor/preloading_model_keyed_service.h"
#include "chrome/browser/optimization_guide/optimization_guide_keyed_service.h"
#include "components/optimization_guide/machine_learning_tflite_buildflags.h"
#if BUILDFLAG(BUILD_WITH_TFLITE_LIB)
#include "chrome/browser/navigation_predictor/preloading_model_handler.h"
#endif
namespace {
// The model takes all of its inputs as floats, so this is a convenience
// function for turning various types into floats.
template <typename T>
constexpr float ToInput(T val) {
return static_cast<float>(val);
}
template <>
constexpr float ToInput(base::TimeDelta val) {
return static_cast<float>(val.InMillisecondsF());
}
static_assert(1.0f == ToInput(true));
} // namespace
PreloadingModelKeyedService::Inputs::Inputs() = default;
PreloadingModelKeyedService::Inputs::Inputs(const Inputs& other) = default;
PreloadingModelKeyedService::Inputs&
PreloadingModelKeyedService::Inputs::operator=(const Inputs& other) = default;
PreloadingModelKeyedService::PreloadingModelKeyedService(
OptimizationGuideKeyedService* optimization_guide_keyed_service) {
#if BUILDFLAG(BUILD_WITH_TFLITE_LIB)
auto* model_provider =
static_cast<optimization_guide::OptimizationGuideModelProvider*>(
optimization_guide_keyed_service);
if (model_provider) {
preloading_model_handler_ =
std::make_unique<PreloadingModelHandler>(model_provider);
}
#endif
}
PreloadingModelKeyedService::~PreloadingModelKeyedService() = default;
void PreloadingModelKeyedService::AddOnModelUpdatedCallbackForTesting(
base::OnceClosure callback) {
#if BUILDFLAG(BUILD_WITH_TFLITE_LIB)
CHECK(preloading_model_handler_);
preloading_model_handler_->AddOnModelUpdatedCallback(std::move(callback));
#endif
}
void PreloadingModelKeyedService::Score(base::CancelableTaskTracker* tracker,
const Inputs& inputs,
ResultCallback result_callback) {
#if BUILDFLAG(BUILD_WITH_TFLITE_LIB)
if (!preloading_model_handler_ ||
!preloading_model_handler_->ModelAvailable()) {
std::move(result_callback).Run(std::nullopt);
return;
}
std::vector<float> model_input{
/* input 0 */ ToInput(inputs.contains_image),
/* input 1 */ ToInput(inputs.font_size),
/* input 2 */ ToInput(inputs.has_text_sibling),
/* input 3 */ ToInput(inputs.is_bold),
/* input 4 */ ToInput(inputs.is_in_iframe),
/* input 5 */ ToInput(inputs.is_url_incremented_by_one),
/* input 6 */
ToInput(inputs.navigation_start_to_link_logged),
/* input 7 */ ToInput(inputs.path_depth),
/* input 8 */ ToInput(inputs.path_length),
/* input 9 */ ToInput(inputs.percent_clickable_area),
/* input 10*/ ToInput(inputs.percent_vertical_distance),
/* input 11*/ ToInput(inputs.is_same_host),
/* input 12*/ ToInput(inputs.is_in_viewport),
/* input 13*/ ToInput(inputs.is_pointer_hovering_over),
/* input 14*/
ToInput(inputs.entered_viewport_to_left_viewport),
/* input 15*/
ToInput(inputs.hover_dwell_time),
/* input 16*/ ToInput(inputs.pointer_hovering_over_count)};
preloading_model_handler_->ExecuteModelWithInput(
tracker, std::move(result_callback), model_input);
#else
std::move(result_callback).Run(std::nullopt);
#endif
}
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