ClickHouse/src/Interpreters/CatBoostModel.h
2021-10-02 11:39:26 +03:00

90 lines
2.4 KiB
C++

#pragma once
#include <Interpreters/IExternalLoadable.h>
#include <Columns/IColumn.h>
#include <Columns/ColumnsNumber.h>
namespace DB
{
/// CatBoost wrapper interface functions.
struct CatBoostWrapperAPI;
class CatBoostWrapperAPIProvider
{
public:
virtual ~CatBoostWrapperAPIProvider() = default;
virtual const CatBoostWrapperAPI & getAPI() const = 0;
};
/// CatBoost model interface.
class ICatBoostModel
{
public:
virtual ~ICatBoostModel() = default;
/// Evaluate model. Use first `float_features_count` columns as float features,
/// the others `cat_features_count` as categorical features.
virtual ColumnPtr evaluate(const ColumnRawPtrs & columns) const = 0;
virtual size_t getFloatFeaturesCount() const = 0;
virtual size_t getCatFeaturesCount() const = 0;
virtual size_t getTreeCount() const = 0;
};
class IDataType;
using DataTypePtr = std::shared_ptr<const IDataType>;
/// General ML model evaluator interface.
class IModel : public IExternalLoadable
{
public:
virtual ColumnPtr evaluate(const ColumnRawPtrs & columns) const = 0;
virtual std::string getTypeName() const = 0;
virtual DataTypePtr getReturnType() const = 0;
};
class CatBoostModel : public IModel
{
public:
CatBoostModel(std::string name, std::string model_path,
std::string lib_path, const ExternalLoadableLifetime & lifetime);
ColumnPtr evaluate(const ColumnRawPtrs & columns) const override;
std::string getTypeName() const override { return "catboost"; }
size_t getFloatFeaturesCount() const;
size_t getCatFeaturesCount() const;
size_t getTreeCount() const;
DataTypePtr getReturnType() const override;
/// IExternalLoadable interface.
const ExternalLoadableLifetime & getLifetime() const override;
const std::string & getLoadableName() const override { return name; }
bool supportUpdates() const override { return true; }
bool isModified() const override;
std::shared_ptr<const IExternalLoadable> clone() const override;
private:
const std::string name;
std::string model_path;
std::string lib_path;
ExternalLoadableLifetime lifetime;
std::shared_ptr<CatBoostWrapperAPIProvider> api_provider;
const CatBoostWrapperAPI * api;
std::unique_ptr<ICatBoostModel> model;
size_t float_features_count;
size_t cat_features_count;
size_t tree_count;
void init();
};
}