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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_OMNIBOX_BROWSER_AUTOCOMPLETE_SCORING_MODEL_HANDLER_H_
#define COMPONENTS_OMNIBOX_BROWSER_AUTOCOMPLETE_SCORING_MODEL_HANDLER_H_
#include <optional>
#include "base/gtest_prod_util.h"
#include "base/task/sequenced_task_runner.h"
#include "components/omnibox/browser/autocomplete_scoring_model_executor.h"
#include "components/optimization_guide/core/delivery/optimization_guide_model_provider.h"
#include "components/optimization_guide/core/inference/model_handler.h"
#include "components/optimization_guide/proto/autocomplete_scoring_model_metadata.pb.h"
#include "components/optimization_guide/proto/models.pb.h"
#include "third_party/metrics_proto/omnibox_scoring_signals.pb.h"
// Implements optimization_guide::ModelHandler for autocomplete scoring.
// Keeps scoring model in memory.
class AutocompleteScoringModelHandler
: public optimization_guide::ModelHandler<
AutocompleteScoringModelExecutor::ModelOutput,
AutocompleteScoringModelExecutor::ModelInput> {
public:
using ScoringSignals = ::metrics::OmniboxScoringSignals;
AutocompleteScoringModelHandler(
optimization_guide::OptimizationGuideModelProvider* model_provider,
scoped_refptr<base::SequencedTaskRunner> model_executor_task_runner,
std::unique_ptr<AutocompleteScoringModelExecutor> model_executor,
optimization_guide::proto::OptimizationTarget optimization_target,
const std::optional<optimization_guide::proto::Any>& model_metadata);
~AutocompleteScoringModelHandler() override;
// Disallow copy/assign.
AutocompleteScoringModelHandler(const AutocompleteScoringModelHandler&) =
delete;
AutocompleteScoringModelHandler& operator=(
const AutocompleteScoringModelHandler&) = delete;
// Construct the model input from scoring signals. Signals are appended to the
// input vector in the same order as signal specifications in the metadata.
// Checks validness of signals and applies transformation if configured in
// metadata. Returns nullopt if the model or metadata is missing.
std::optional<std::vector<float>> GetModelInput(
const ScoringSignals& scoring_signals);
// Construct a batch model input from a vector of scoring signals.
std::optional<std::vector<std::vector<float>>> GetBatchModelInput(
const std::vector<const ScoringSignals*>& scoring_signals_vec);
private:
FRIEND_TEST_ALL_PREFIXES(AutocompleteScoringModelHandlerTest,
ExtractInputFromScoringSignalsTest);
// Extracts the model input from scoring signals according to the model
// metadata.
std::vector<float> ExtractInputFromScoringSignals(
const ScoringSignals& scoring_signals,
const optimization_guide::proto::AutocompleteScoringModelMetadata&
metadata);
};
#endif // COMPONENTS_OMNIBOX_BROWSER_AUTOCOMPLETE_SCORING_MODEL_HANDLER_H_
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