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JPMML class model evaluator
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/*
* Copyright (c) 2017 Villu Ruusmann
*
* This file is part of JPMML-Evaluator
*
* JPMML-Evaluator 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-Evaluator 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-Evaluator. If not, see predictions){
switch(multipleModelMethod){
case SELECT_FIRST:
case SELECT_ALL:
case MODEL_CHAIN:
case MULTI_MODEL_CHAIN:
{
if(predictions instanceof SegmentResult){
SegmentResult segmentResult = (SegmentResult)predictions;
return segmentResult;
}
}
break;
default:
break;
}
return null;
}
static
public Value aggregateValues(ValueFactory valueFactory, Segmentation.MultipleModelMethod multipleModelMethod, Segmentation.MissingPredictionTreatment missingPredictionTreatment, Number missingThreshold, List segmentResults){
ValueAggregator aggregator;
switch(multipleModelMethod){
case AVERAGE:
case SUM:
aggregator = new ValueAggregator.UnivariateStatistic<>(valueFactory);
break;
case MEDIAN:
aggregator = new ValueAggregator.Median<>(valueFactory, segmentResults.size());
break;
case WEIGHTED_AVERAGE:
case WEIGHTED_SUM:
aggregator = new ValueAggregator.WeightedUnivariateStatistic<>(valueFactory);
break;
case WEIGHTED_MEDIAN:
aggregator = new ValueAggregator.WeightedMedian<>(valueFactory, segmentResults.size());
break;
default:
throw new IllegalArgumentException();
}
Fraction missingFraction = null;
segmentResults:
for(SegmentResult segmentResult : segmentResults){
Object targetValue = EvaluatorUtil.decode(segmentResult.getTargetValue());
if(targetValue == null){
switch(missingPredictionTreatment){
case RETURN_MISSING:
return null;
case SKIP_SEGMENT:
if(missingFraction == null){
missingFraction = new Fraction<>(valueFactory, segmentResults);
} // End if
if(missingFraction.update(segmentResult, missingThreshold)){
return null;
}
continue segmentResults;
case CONTINUE:
return null;
default:
throw new IllegalArgumentException();
}
}
Number value;
try {
if(targetValue instanceof Number){
value = (Number)targetValue;
} else
{
value = (Number)TypeUtil.cast(DataType.DOUBLE, targetValue);
}
} catch(TypeCheckException tce){
throw tce.ensureContext(segmentResult.getSegment());
}
switch(multipleModelMethod){
case AVERAGE:
case SUM:
case MEDIAN:
aggregator.add(value);
break;
case WEIGHTED_AVERAGE:
case WEIGHTED_SUM:
case WEIGHTED_MEDIAN:
Number weight = segmentResult.getWeight();
aggregator.add(value, weight);
break;
default:
throw new IllegalArgumentException();
}
}
switch(multipleModelMethod){
case AVERAGE:
return aggregator.average();
case WEIGHTED_AVERAGE:
return aggregator.weightedAverage();
case SUM:
return aggregator.sum();
case WEIGHTED_SUM:
return aggregator.weightedSum();
case MEDIAN:
return aggregator.median();
case WEIGHTED_MEDIAN:
return aggregator.weightedMedian();
default:
throw new IllegalArgumentException();
}
}
static
public ValueMap aggregateVotes(ValueFactory valueFactory, Segmentation.MultipleModelMethod multipleModelMethod, Segmentation.MissingPredictionTreatment missingPredictionTreatment, Number missingThreshold, List segmentResults){
VoteAggregator aggregator = new VoteAggregator<>(valueFactory);
Fraction missingFraction = null;
segmentResults:
for(SegmentResult segmentResult : segmentResults){
Object targetValue = EvaluatorUtil.decode(segmentResult.getTargetValue());
if(targetValue == null){
switch(missingPredictionTreatment){
case RETURN_MISSING:
return null;
case SKIP_SEGMENT:
case CONTINUE:
if(missingFraction == null){
missingFraction = new Fraction<>(valueFactory, segmentResults);
} // End if
if(missingFraction.update(segmentResult, missingThreshold)){
return null;
}
break;
default:
throw new IllegalArgumentException();
} // End switch
switch(missingPredictionTreatment){
case SKIP_SEGMENT:
continue segmentResults;
case CONTINUE:
break;
default:
throw new IllegalArgumentException();
}
}
switch(multipleModelMethod){
case MAJORITY_VOTE:
aggregator.add(targetValue);
break;
case WEIGHTED_MAJORITY_VOTE:
Number weight = segmentResult.getWeight();
aggregator.add(targetValue, weight);
break;
default:
throw new IllegalArgumentException();
}
}
ValueMap result = aggregator.sumMap();
switch(missingPredictionTreatment){
case CONTINUE:
// Remove the "missing" pseudo-category
Value missingVoteSum = result.remove(null);
if(missingVoteSum != null){
Collection> voteSums = result.values();
// "The missing result is returned if it gets the most (possibly weighted) votes"
if(!voteSums.isEmpty() && (missingVoteSum).compareTo(Collections.max(voteSums)) > 0){
return null;
}
}
break;
default:
break;
}
return result;
}
static
public ValueMap aggregateProbabilities(ValueFactory valueFactory, Segmentation.MultipleModelMethod multipleModelMethod, Segmentation.MissingPredictionTreatment missingPredictionTreatment, Number missingThreshold, List categories, List segmentResults){
ProbabilityAggregator aggregator;
switch(multipleModelMethod){
case AVERAGE:
aggregator = new ProbabilityAggregator.Average<>(valueFactory);
break;
case WEIGHTED_AVERAGE:
aggregator = new ProbabilityAggregator.WeightedAverage<>(valueFactory);
break;
case MEDIAN:
aggregator = new ProbabilityAggregator.Median<>(valueFactory, segmentResults.size());
break;
case MAX:
aggregator = new ProbabilityAggregator.Max<>(valueFactory, segmentResults.size());
break;
default:
throw new IllegalArgumentException();
}
Fraction missingFraction = null;
segmentResults:
for(SegmentResult segmentResult : segmentResults){
Object targetValue = segmentResult.getTargetValue();
if(targetValue == null){
switch(missingPredictionTreatment){
case RETURN_MISSING:
return null;
case SKIP_SEGMENT:
if(missingFraction == null){
missingFraction = new Fraction<>(valueFactory, segmentResults);
} // End if
if(missingFraction.update(segmentResult, missingThreshold)){
return null;
}
continue segmentResults;
case CONTINUE:
return null;
default:
throw new IllegalArgumentException();
}
}
HasProbability hasProbability;
try {
hasProbability = TypeUtil.cast(HasProbability.class, targetValue);
} catch(TypeCheckException tce){
throw tce.ensureContext(segmentResult.getSegment());
}
switch(multipleModelMethod){
case AVERAGE:
case MEDIAN:
case MAX:
aggregator.add(hasProbability);
break;
case WEIGHTED_AVERAGE:
Number weight = segmentResult.getWeight();
aggregator.add(hasProbability, weight);
break;
default:
throw new IllegalArgumentException();
}
}
switch(multipleModelMethod){
case AVERAGE:
return aggregator.averageMap();
case WEIGHTED_AVERAGE:
return aggregator.weightedAverageMap();
case MEDIAN:
return aggregator.medianMap(categories);
case MAX:
return aggregator.maxMap(categories);
default:
throw new IllegalArgumentException();
}
}
static
private class Fraction {
private Value weightSum = null;
private Value missingWeightSum = null;
private Fraction(ValueFactory valueFactory, List segmentResults){
this.weightSum = valueFactory.newValue();
this.missingWeightSum = valueFactory.newValue();
for(int i = 0, max = segmentResults.size(); i < max; i++){
SegmentResult segmentResult = segmentResults.get(i);
this.weightSum.add(segmentResult.getWeight());
}
}
public boolean update(SegmentResult segmentResult, Number missingThreshold){
this.missingWeightSum.add(segmentResult.getWeight());
return (this.missingWeightSum.doubleValue() / this.weightSum.doubleValue()) > missingThreshold.doubleValue();
}
}
}