com.arosbio.ml.metrics.cp.regression.MedianPredictionIntervalWidth Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of confai Show documentation

Conformal AI package, including all data IO, transformations, machine learning models and predictor classes. Without inclusion of chemistry-dependent code.

There is a newer version: 2.0.0

Show newest version

/*
 * Copyright (C) Aros Bio AB.
 *
 * CPSign is an Open Source Software that is dual licensed to allow you to choose a license that best suits your requirements:
 *
 * 1) GPLv3 (GNU General Public License Version 3) with Additional Terms, including an attribution clause as well as a limitation to use the software for commercial purposes.
 *
 * 2) CPSign Proprietary License that allows you to use CPSign for commercial activities, such as in a revenue-generating operation or environment, or integrate CPSign in your proprietary software without worrying about disclosing the source code of your proprietary software, which is required if you choose to use the software under GPLv3 license. See arosbio.com/cpsign/commercial-license for details.
 */
package com.arosbio.ml.metrics.cp.regression;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import com.arosbio.commons.MathUtils;
import com.arosbio.commons.mixins.Aliased;
import com.arosbio.commons.mixins.Described;
import com.arosbio.ml.metrics.SingleValuedMetric;
import com.arosbio.ml.metrics.cp.ConfidenceDependentMetric;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Range;

public class MedianPredictionIntervalWidth implements SingleValuedMetric, 
	CPRegressionMetric, Aliased, Described {

	public static final String METRIC_NAME = "Median prediction-interval width";
	public static final String METRIC_ALIAS = "MedianPredWidth";
	public final static String METRIC_DESCRIPTION = "The median prediction interval width at a fixed confidence level. The metric should be minimized for the highest informational efficiency.";
	
	private List predIntervals=new ArrayList<>();
	private double confidenceLevel;
	
	public MedianPredictionIntervalWidth() {
		this(ConfidenceDependentMetric.DEFAULT_CONFIDENCE);
	}
	
	public MedianPredictionIntervalWidth(double confidenceLevel) {
		this.confidenceLevel = confidenceLevel;
	}
	
	@Override
	public String getName() {
		return METRIC_NAME;
	}
	
	@Override
	public String getDescription() {
		return METRIC_DESCRIPTION;
	}
	
	@Override
	public String[] getAliases() {
		return new String[]{METRIC_ALIAS};
	}

	@Override
	public int getNumExamples() {
		return predIntervals.size();
	}

	@Override
	public void clear() {
		predIntervals.clear();
	}

	@Override
	public boolean goalIsMinimization() {
		return true;
	}

	@Override
	public void addPrediction(double trueLabel, Range predictedInterval) {
		predIntervals.add(predictedInterval.upperEndpoint()-predictedInterval.lowerEndpoint());
	}
	
	@Override
	public double getConfidence() {
		return confidenceLevel;
	}
	
	@Override
	public void setConfidence(double confidence) {
		if (confidence< 0 || confidence > 1)
			throw new IllegalArgumentException("Confidence must be in the range [0,1]");
		if (!predIntervals.isEmpty())
			throw new IllegalStateException("Cannot change the confidence when predictions has been added");
		this.confidenceLevel = confidence;
	}

	@Override
	public double getScore() {
		if (predIntervals.isEmpty())
			return Double.NaN;
		return MathUtils.median(predIntervals);
	}

	@Override
	public Map asMap() {
		return ImmutableMap.of(METRIC_NAME,getScore());
	}

	@Override
	public MedianPredictionIntervalWidth clone() {
		return new MedianPredictionIntervalWidth(confidenceLevel);
	}

	public String toString() {
		return SingleValuedMetric.toString(this);
	}

}