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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "function.h"
#include <vespa/vespalib/util/optimized.h>
#include <memory>
#include <cassert>
#include <cmath>
namespace vespalib::eval::gbdt {
/**
* Use modern optimization strategies to improve evaluation
* performance of GBDT forests.
*
* Comparisons must be on the form 'feature < const' or '!(feature >=
* const)'. The inverted form is used to signal that the true branch
* should be selected when the feature value is missing (NaN).
**/
class FastForest
{
protected:
FastForest();
public:
virtual ~FastForest();
using UP = std::unique_ptr<FastForest>;
class Context {
protected:
Context();
public:
virtual ~Context();
using UP = std::unique_ptr<Context>;
};
static UP try_convert(const Function &fun, size_t min_fixed = 8, size_t max_fixed = 64);
virtual vespalib::string impl_name() const = 0;
virtual Context::UP create_context() const = 0;
virtual double eval(Context &context, const float *params) const = 0;
double estimate_cost_us(const std::vector<double> ¶ms, double budget = 5.0) const;
};
}
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