Function ExportModel

catboost/libs/model/model_export/model_exporter.cpp:136–216

    }

    void ExportModel(
        const TFullModel& model,
        const TString& modelFile,
        const EModelType format,
        const TString& userParametersJson,
        bool addFileFormatExtension,
        const TVector<TString>* featureId,
        const THashMap<ui32, TString>* catFeaturesHashToString
    ) {
        //TODO(eermishkina): support non symmetric trees
        CB_ENSURE(model.IsOblivious() || format == EModelType::CatboostBinary || format == EModelType::Json || format == EModelType::Pmml,
            "Can save non symmetric trees only in cbm, Json, or Pmml format");
        //TODO(d-kruchinin): support text features
        CB_ENSURE(
            !model.TextProcessingCollection || format == EModelType::CatboostBinary,
            "Can save model with text features only in cbm format"
        );
        //TODO(akhropov): support embedding features
        CB_ENSURE(
            !model.EmbeddingProcessingCollection || format == EModelType::CatboostBinary,
            "Can save model with embedding features only in cbm format"
        );
        const auto modelFileName = NCatboostOptions::AddExtension(format, modelFile, addFileFormatExtension);
        switch (format) {
            case EModelType::CatboostBinary:
                CB_ENSURE(
                    userParametersJson.empty(),
                    "JSON user params for CatBoost model export are not supported"
                );
                OutputModel(model, modelFileName);
                break;
            case EModelType::AppleCoreML:
                {
                    TStringInput is(userParametersJson);
                    NJson::TJsonValue params;
                    NJson::ReadJsonTree(&is, &params);
                    CB_ENSURE_SCALE_IDENTITY(model.GetScaleAndBias(), "exporting CoreML model");
                    OutputModelCoreML(model, modelFileName, params, catFeaturesHashToString);
                }
                break;
            case EModelType::Json:
                {
                    CB_ENSURE(
                        userParametersJson.empty(),
                        "JSON user params for JSON model export are not supported"
                    );

                    OutputModelJson(model, modelFileName, featureId, catFeaturesHashToString);
                }
                break;
            case EModelType::Onnx:
                {
                    OutputModelOnnx(model, modelFileName, userParametersJson);
                }
                break;
            case EModelType::Pmml:
                {
                    TStringInput is(userParametersJson);