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JPMML class model evaluator
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/*
* Copyright (c) 2013 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 Value evaluateSimilarity(ValueFactory valueFactory, ComparisonMeasure comparisonMeasure, List> comparisonFields, BitSet flags, BitSet referenceFlags){
Similarity measure = TypeUtil.cast(Similarity.class, comparisonMeasure.requireMeasure());
int a11 = 0;
int a10 = 0;
int a01 = 0;
int a00 = 0;
for(int i = 0, max = comparisonFields.size(); i < max; i++){
if(flags.get(i)){
if(referenceFlags.get(i)){
a11 += 1;
} else
{
a10 += 1;
}
} else
{
if(referenceFlags.get(i)){
a01 += 1;
} else
{
a00 += 1;
}
}
}
Value numerator = valueFactory.newValue();
Value denominator = valueFactory.newValue();
if(measure instanceof SimpleMatching){
numerator.add(a11 + a00);
denominator.add(a11 + a10 + a01 + a00);
} else
if(measure instanceof Jaccard){
numerator.add(a11);
denominator.add(a11 + a10 + a01);
} else
if(measure instanceof Tanimoto){
numerator.add(a11 + a00);
denominator
.add(a11)
.add(Numbers.DOUBLE_TWO, (a10 + a01))
.add(a00);
} else
if(measure instanceof BinarySimilarity){
BinarySimilarity binarySimilarity = (BinarySimilarity)measure;
Number c00 = binarySimilarity.requireC00Parameter();
Number c01 = binarySimilarity.requireC01Parameter();
Number c10 = binarySimilarity.requireC10Parameter();
Number c11 = binarySimilarity.requireC11Parameter();
numerator
.add(c11, a11)
.add(c10, a10)
.add(c01, a01)
.add(c00, a00);
Number d00 = binarySimilarity.requireD00Parameter();
Number d01 = binarySimilarity.requireD01Parameter();
Number d10 = binarySimilarity.requireD10Parameter();
Number d11 = binarySimilarity.requireD11Parameter();
denominator
.add(d11, a11)
.add(d10, a10)
.add(d01, a01)
.add(d00, a00);
} else
{
throw new UnsupportedElementException(measure);
} // End if
if(denominator.isZero()){
throw new UndefinedResultException();
}
return numerator.divide(denominator);
}
static
public BitSet toBitSet(List values){
BitSet result = new BitSet(values.size());
for(int i = 0, max = values.size(); i < max; i++){
FieldValue value = values.get(i);
if(value.equalsValue(Boolean.FALSE)){
result.set(i, false);
} else
if(value.equalsValue(Boolean.TRUE)){
result.set(i, true);
} else
{
throw new EvaluationException("Expected " + EvaluationException.formatValue(Boolean.FALSE) + " or " + EvaluationException.formatValue(Boolean.TRUE) + ", got " + EvaluationException.formatValue(value));
}
}
return result;
}
static
public Value evaluateDistance(ValueFactory valueFactory, ComparisonMeasure comparisonMeasure, List> comparisonFields, List values, List referenceValues, Value adjustment){
Distance measure = TypeUtil.cast(Distance.class, comparisonMeasure.requireMeasure());
Number innerPower;
Number outerPower;
if(measure instanceof Euclidean){
innerPower = outerPower = Numbers.DOUBLE_TWO;
} else
if(measure instanceof SquaredEuclidean){
innerPower = Numbers.DOUBLE_TWO;
outerPower = Numbers.DOUBLE_ONE;
} else
if(measure instanceof Chebychev || measure instanceof CityBlock){
innerPower = outerPower = Numbers.DOUBLE_ONE;
} else
if(measure instanceof Minkowski){
Minkowski minkowski = (Minkowski)measure;
Number p = minkowski.requirePParameter();
if(p.doubleValue() < 0d){
throw new InvalidAttributeException(minkowski, PMMLAttributes.MINKOWSKI_PPARAMETER, p);
}
innerPower = outerPower = p;
} else
{
throw new UnsupportedElementException(measure);
}
Vector distances = valueFactory.newVector(0);
for(int i = 0, max = comparisonFields.size(); i < max; i++){
ComparisonField comparisonField = comparisonFields.get(i);
FieldValue value = values.get(i);
if(FieldValueUtil.isMissing(value)){
continue;
}
FieldValue referenceValue = referenceValues.get(i);
Value distance = evaluateInnerFunction(valueFactory, comparisonMeasure, comparisonField, value, referenceValue, innerPower);
distances.add(distance);
}
if(measure instanceof Euclidean || measure instanceof SquaredEuclidean || measure instanceof CityBlock || measure instanceof Minkowski){
Value result = distances.sum()
.multiply(adjustment)
.inversePower(outerPower);
return result;
} else
if(measure instanceof Chebychev){
Value result = distances.max()
.multiply(adjustment);
return result;
} else
{
throw new UnsupportedElementException(measure);
}
}
static
private Value evaluateInnerFunction(ValueFactory valueFactory, ComparisonMeasure comparisonMeasure, ComparisonField comparisonField, FieldValue value, FieldValue referenceValue, Number power){
CompareFunction compareFunction = comparisonField.getCompareFunction();
if(compareFunction == null){
compareFunction = comparisonMeasure.getCompareFunction();
// The ComparisonMeasure element is limited to "attribute-less" comparison functions
switch(compareFunction){
case ABS_DIFF:
case DELTA:
case EQUAL:
break;
case GAUSS_SIM:
case TABLE:
throw new InvalidAttributeException(comparisonMeasure, compareFunction);
default:
throw new UnsupportedAttributeException(comparisonMeasure, compareFunction);
}
}
Value distance;
switch(compareFunction){
case ABS_DIFF:
{
distance = valueFactory.newValue(value.asNumber())
.subtract(referenceValue.asNumber())
.abs();
}
break;
case GAUSS_SIM:
{
Number similarityScale = comparisonField.getSimilarityScale();
if(similarityScale == null){
throw new InvalidElementException(comparisonField);
}
distance = valueFactory.newValue(value.asNumber())
.subtract(referenceValue.asNumber())
.gaussSim(similarityScale);
}
break;
case DELTA:
{
boolean equals = (value).equalsValue(referenceValue);
distance = valueFactory.newValue(equals ? Numbers.DOUBLE_ZERO : Numbers.DOUBLE_ONE);
}
break;
case EQUAL:
{
boolean equals = (value).equalsValue(referenceValue);
distance = valueFactory.newValue(equals ? Numbers.DOUBLE_ONE : Numbers.DOUBLE_ZERO);
}
break;
case TABLE:
throw new UnsupportedAttributeException(comparisonField, compareFunction);
default:
throw new UnsupportedAttributeException(comparisonField, compareFunction);
}
distance.power(power);
Number fieldWeight = comparisonField.getFieldWeight();
if(fieldWeight != null){
distance.multiply(fieldWeight);
}
return distance;
}
static
public Value calculateAdjustment(ValueFactory valueFactory, List values){
return calculateAdjustment(valueFactory, values, null);
}
static
public Value calculateAdjustment(ValueFactory valueFactory, List values, List adjustmentValues){
Value sum = valueFactory.newValue();
Value nonmissingSum = valueFactory.newValue();
for(int i = 0, max = values.size(); i < max; i++){
FieldValue value = values.get(i);
Number adjustmentValue = (adjustmentValues != null ? adjustmentValues.get(i) : Numbers.DOUBLE_ONE);
sum.add(adjustmentValue);
if(!FieldValueUtil.isMissing(value)){
nonmissingSum.add(adjustmentValue);
}
}
if(nonmissingSum.isZero()){
throw new UndefinedResultException();
}
return sum.divide(nonmissingSum);
}
}