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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 "gbdt.h"
namespace vespalib {
namespace eval {
namespace gbdt {
/**
* GBDT forest optimizer using a compact tree representation combined
* with a leaf-node search and aggregate evaluation strategy. This
* code is very similar to the old VM instruction for MLR expressions.
**/
class VMForest : public Forest
{
private:
std::vector<uint32_t> _model;
public:
VMForest(std::vector<uint32_t> &&model) : _model(std::move(model)) {}
static Optimize::Result less_only_optimize(const ForestStats &stats,
const std::vector<const nodes::Node *> &trees);
static double less_only_eval(const Forest *forest, const double *);
static Optimize::Result general_optimize(const ForestStats &stats,
const std::vector<const nodes::Node *> &trees);
static double general_eval(const Forest *forest, const double *);
static Optimize::Chain optimize_chain;
};
} // namespace vespalib::eval::gbdt
} // namespace vespalib::eval
} // namespace vespalib
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