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Java library and command-line application for converting LightGBM models to PMML

There is a newer version: 1.5.5

/*
 * Copyright (c) 2017 Villu Ruusmann
 *
 * This file is part of JPMML-LightGBM
 *
 * JPMML-LightGBM is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JPMML-LightGBM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with JPMML-LightGBM.  If not, see .
 */
package org.jpmml.lightgbm;

import java.util.List;

import org.dmg.pmml.DataField;
import org.dmg.pmml.DataType;
import org.dmg.pmml.FieldName;
import org.dmg.pmml.OpType;
import org.jpmml.converter.CategoricalLabel;
import org.jpmml.converter.Label;
import org.jpmml.converter.LabelUtil;
import org.jpmml.converter.PMMLEncoder;

abstract
public class Classification extends ObjectiveFunction {

	private int num_class_;


	public Classification(boolean average_output, int num_class){
		super(average_output);

		this.num_class_ = num_class;
	}

	@Override
	public Label encodeLabel(FieldName targetField, List targetCategories, PMMLEncoder encoder){
		DataField dataField;

		if(targetCategories == null){
			targetCategories = LabelUtil.createTargetCategories(this.num_class_);

			dataField = encoder.createDataField(targetField, OpType.CATEGORICAL, DataType.INTEGER, targetCategories);
		} else

		{
			if(targetCategories.size() != this.num_class_){
				throw new IllegalArgumentException("Expected " + this.num_class_ + " target categories, got " + targetCategories.size() + " target categories");
			}

			dataField = encoder.createDataField(targetField, OpType.CATEGORICAL, DataType.STRING, targetCategories);
		}

		return new CategoricalLabel(dataField);
	}

	public int getNumClass(){
		return this.num_class_;
	}
}