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JPMML class model evaluator
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/*
* Copyright (c) 2016 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 extends ModelManager implements Evaluator {
private Configuration configuration = null;
private InputMapper inputMapper = null;
private ResultMapper resultMapper = null;
private ValueFactory valueFactory = null;
private Boolean parentCompatible = null;
private Boolean pure = null;
private Integer numberOfVisibleFields = null;
protected ModelEvaluator(){
}
protected ModelEvaluator(PMML pmml, M model){
super(pmml, model);
MathContext mathContext = model.getMathContext();
switch(mathContext){
case FLOAT:
case DOUBLE:
break;
default:
throw new UnsupportedAttributeException(model, mathContext);
}
}
/**
*
* Configures the runtime behaviour of this model evaluator.
*
*
*
* Must be called once before the first evaluation.
* May be called any number of times between subsequent evaluations.
*
*/
public void configure(Configuration configuration){
setConfiguration(configuration);
setValueFactory(null);
resetInputFields();
resetResultFields();
}
/**
*
* Indicates if this model evaluator is compatible with its parent model evaluator.
*
*
*
* A parent compatible model evaluator inherits {@link DataField} declarations unchanged,
* which makes it possible to propagate {@link DataField} and global {@link DerivedField} values between evaluation contexts during evaluation.
*
*/
public boolean isParentCompatible(){
if(this.parentCompatible == null){
this.parentCompatible = assessParentCompatibility();
}
return this.parentCompatible;
}
/**
*
* Indicates if this model evaluator represents a pure function.
*
*
*
* A pure model evaluator does not tamper with the evaluation context during evaluation.
*
*/
public boolean isPure(){
if(this.pure == null){
this.pure = assessPurity();
}
return this.pure;
}
protected int getNumberOfVisibleFields(){
if(this.numberOfVisibleFields == null){
ListMultimap> visibleFields = getVisibleFields();
this.numberOfVisibleFields = visibleFields.size();
}
return this.numberOfVisibleFields;
}
@Override
public ModelEvaluator verify(){
M model = getModel();
ModelVerification modelVerification = model.getModelVerification();
if(modelVerification == null){
return this;
}
VerificationBatch batch = parseModelVerification(modelVerification);
List> records = batch.getRecords();
List inputFields = getInputFields();
if(this instanceof HasGroupFields){
HasGroupFields hasGroupFields = (HasGroupFields)this;
records = EvaluatorUtil.groupRows(hasGroupFields, records);
}
List targetFields = getTargetFields();
List outputFields = getOutputFields();
SetView intersection = Sets.intersection(batch.keySet(), new LinkedHashSet<>(Lists.transform(outputFields, OutputField::getFieldName)));
boolean disjoint = intersection.isEmpty();
for(Map record : records){
Map arguments = new LinkedHashMap<>();
for(InputField inputField : inputFields){
String name = inputField.getFieldName();
FieldValue value = inputField.prepare(record.get(name));
arguments.put(name, value);
}
ModelEvaluationContext context = createEvaluationContext();
context.setArguments(arguments);
Map results = evaluateInternal(context);
// "If there exist VerificationField elements that refer to OutputField elements,
// then any VerificationField element that refers to a MiningField element whose "usageType=target" should be ignored,
// because they are considered to represent a dependent variable from the training data set, not an expected output"
if(!disjoint){
for(OutputField outputField : outputFields){
String name = outputField.getFieldName();
VerificationField verificationField = batch.get(name);
if(verificationField == null){
continue;
}
verify(record.get(name), results.get(name), verificationField.getPrecision(), verificationField.getZeroThreshold());
}
} else
// "If there are no such VerificationField elements,
// then any VerificationField element that refers to a MiningField element whose "usageType=target" should be considered to represent an expected output"
{
for(TargetField targetField : targetFields){
String name = targetField.getFieldName();
VerificationField verificationField = batch.get(name);
if(verificationField == null){
continue;
}
Number precision = verificationField.getPrecision();
Number zeroThreshold = verificationField.getZeroThreshold();
verify(record.get(name), EvaluatorUtil.decode(results.get(name)), precision, zeroThreshold);
}
}
}
return this;
}
private void verify(Object expected, Object actual, Number precision, Number zeroThreshold){
if(expected == null){
return;
} // End if
if(actual instanceof Collection){
// Ignored
} else
{
DataType dataType = TypeUtil.getDataType(actual);
expected = TypeUtil.parseOrCast(dataType, expected);
}
boolean acceptable = VerificationUtil.acceptable(expected, actual, precision.doubleValue(), zeroThreshold.doubleValue());
if(!acceptable){
throw new EvaluationException("Values " + EvaluationException.formatValue(expected) + " and " + EvaluationException.formatValue(actual) + " do not match");
}
}
public ModelEvaluationContext createEvaluationContext(){
return new ModelEvaluationContext(this);
}
@Override
public Map evaluate(Map arguments){
Configuration configuration = ensureConfiguration();
SymbolTable prevDerivedFieldGuard = null;
SymbolTable derivedFieldGuard = configuration.getDerivedFieldGuard();
SymbolTable prevFunctionGuard = null;
SymbolTable functionGuard = configuration.getFunctionGuard();
arguments = processArguments(arguments);
ModelEvaluationContext context = createEvaluationContext();
context.setArguments(arguments);
Map results;
try {
if(derivedFieldGuard != null){
prevDerivedFieldGuard = EvaluationContext.DERIVEDFIELD_GUARD_PROVIDER.get();
EvaluationContext.DERIVEDFIELD_GUARD_PROVIDER.set(derivedFieldGuard.fork());
} // End if
if(functionGuard != null){
prevFunctionGuard = EvaluationContext.FUNCTION_GUARD_PROVIDER.get();
EvaluationContext.FUNCTION_GUARD_PROVIDER.set(functionGuard.fork());
}
results = evaluateInternal(context);
} finally {
if(derivedFieldGuard != null){
EvaluationContext.DERIVEDFIELD_GUARD_PROVIDER.set(prevDerivedFieldGuard);
} // End if
if(functionGuard != null){
EvaluationContext.FUNCTION_GUARD_PROVIDER.set(prevFunctionGuard);
}
}
results = processResults(results);
return results;
}
protected Map processArguments(Map arguments){
InputMapper inputMapper = getInputMapper();
if(inputMapper != null){
Map remappedArguments = new AbstractMap(){
@Override
public Object get(Object key){
return arguments.get(inputMapper.apply((String)key));
}
@Override
public Set> entrySet(){
throw new UnsupportedOperationException();
}
};
return remappedArguments;
}
return arguments;
}
protected Map processResults(Map results){
ResultMapper resultMapper = getResultMapper();
if(results instanceof OutputMap){
OutputMap outputMap = (OutputMap)results;
outputMap.clearPrivate();
} // End if
if(resultMapper != null){
if(results.isEmpty()){
return results;
} else
if(results.size() == 1){
Map.Entry entry = Iterables.getOnlyElement(results.entrySet());
return Collections.singletonMap(resultMapper.apply(entry.getKey()), entry.getValue());
}
Map remappedResults = new LinkedHashMap<>(2 * results.size());
Collection> entries = results.entrySet();
for(Map.Entry entry : entries){
remappedResults.put(resultMapper.apply(entry.getKey()), entry.getValue());
}
return remappedResults;
}
return results;
}
@Override
protected List filterInputFields(List inputFields){
InputMapper inputMapper = getInputMapper();
if(inputMapper != null){
inputFields = updateNames(inputFields, inputMapper);
}
return inputFields;
}
@Override
protected List filterTargetFields(List targetFields){
ResultMapper resultMapper = getResultMapper();
if(resultMapper != null){
targetFields = updateNames(targetFields, resultMapper);
}
return targetFields;
}
@Override
protected List filterOutputFields(List outputFields){
ResultMapper resultMapper = getResultMapper();
if(!outputFields.isEmpty()){
OutputFilter outputFilter = ensureOutputFilter();
for(Iterator it = outputFields.iterator(); it.hasNext(); ){
OutputField outputField = it.next();
org.dmg.pmml.OutputField pmmlOutputField = outputField.getField();
if(!outputFilter.test(pmmlOutputField)){
it.remove();
}
}
} // End if
if(resultMapper != null){
outputFields = updateNames(outputFields, resultMapper);
}
return outputFields;
}
public Map evaluateInternal(ModelEvaluationContext context){
M model = getModel();
if(!model.isScorable()){
throw new EvaluationException("Model is not scorable", model);
}
ValueFactory valueFactory;
MathContext mathContext = model.getMathContext();
switch(mathContext){
case FLOAT:
case DOUBLE:
valueFactory = ensureValueFactory();
break;
default:
throw new UnsupportedAttributeException(model, mathContext);
}
Map predictions;
MiningFunction miningFunction = model.requireMiningFunction();
switch(miningFunction){
case REGRESSION:
predictions = evaluateRegression(valueFactory, context);
break;
case CLASSIFICATION:
predictions = evaluateClassification(valueFactory, context);
break;
case CLUSTERING:
predictions = evaluateClustering(valueFactory, context);
break;
case ASSOCIATION_RULES:
predictions = evaluateAssociationRules(valueFactory, context);
break;
case SEQUENCES:
predictions = evaluateSequences(valueFactory, context);
break;
case TIME_SERIES:
predictions = evaluateTimeSeries(valueFactory, context);
break;
case MIXED:
predictions = evaluateMixed(valueFactory, context);
break;
default:
throw new UnsupportedAttributeException(model, miningFunction);
}
return OutputUtil.evaluate(predictions, context);
}
protected Map evaluateRegression(ValueFactory valueFactory, EvaluationContext context){
return evaluateDefault();
}
protected Map evaluateClassification(ValueFactory valueFactory, EvaluationContext context){
return evaluateDefault();
}
protected Map evaluateClustering(ValueFactory valueFactory, EvaluationContext context){
return evaluateDefault();
}
protected Map evaluateAssociationRules(ValueFactory valueFactory, EvaluationContext context){
return evaluateDefault();
}
protected Map evaluateSequences(ValueFactory valueFactory, EvaluationContext context){
return evaluateDefault();
}
protected Map evaluateTimeSeries(ValueFactory valueFactory, EvaluationContext context){
return evaluateDefault();
}
protected Map evaluateMixed(ValueFactory valueFactory, EvaluationContext context){
return evaluateDefault();
}
private Map evaluateDefault(){
Model model = getModel();
MiningFunction miningFunction = model.requireMiningFunction();
throw new InvalidAttributeException(model, miningFunction);
}
protected Classification createClassification(ValueMap values){
Set resultFeatures = getResultFeatures();
if(resultFeatures.contains(ResultFeature.PROBABILITY) || resultFeatures.contains(ResultFeature.RESIDUAL)){
return new ProbabilityDistribution<>(values);
} else
if(resultFeatures.contains(ResultFeature.CONFIDENCE)){
return new ConfidenceDistribution<>(values);
} else
{
return new VoteDistribution<>(values);
}
}
protected boolean assessParentCompatibility(){
List inputFields = getInputFields();
for(InputField inputField : inputFields){
Field field = inputField.getField();
MiningField miningField = inputField.getMiningField();
if(!(field instanceof DataField)){
continue;
} // End if
if(!InputFieldUtil.isDefault(field, miningField)){
return false;
}
}
return true;
}
protected boolean assessPurity(){
List inputFields = getInputFields();
for(InputField inputField : inputFields){
Field field = inputField.getField();
MiningField miningField = inputField.getMiningField();
if(!InputFieldUtil.isDefault(field, miningField)){
return false;
}
}
if(hasLocalDerivedFields() || hasOutputFields()){
return false;
}
return true;
}
protected Configuration ensureConfiguration(){
Configuration configuration = getConfiguration();
if(this.configuration == null){
throw new IllegalStateException();
}
return this.configuration;
}
protected ModelEvaluatorFactory ensureModelEvaluatorFactory(){
Configuration configuration = ensureConfiguration();
return configuration.getModelEvaluatorFactory();
}
protected ValueFactoryFactory ensureValueFactoryFactory(){
Configuration configuration = ensureConfiguration();
return configuration.getValueFactoryFactory();
}
protected OutputFilter ensureOutputFilter(){
Configuration configuration = ensureConfiguration();
return configuration.getOutputFilter();
}
protected ValueFactory ensureValueFactory(){
ValueFactory valueFactory = getValueFactory();
if(valueFactory == null){
ValueFactoryFactory valueFactoryFactory = ensureValueFactoryFactory();
MathContext mathContext = getMathContext();
valueFactory = valueFactoryFactory.newValueFactory(mathContext);
setValueFactory(valueFactory);
}
return valueFactory;
}
public Configuration getConfiguration(){
return this.configuration;
}
private void setConfiguration(Configuration configuration){
this.configuration = Objects.requireNonNull(configuration);
}
public InputMapper getInputMapper(){
return this.inputMapper;
}
void setInputMapper(InputMapper inputMapper){
this.inputMapper = inputMapper;
resetInputFields();
}
public ResultMapper getResultMapper(){
return this.resultMapper;
}
void setResultMapper(ResultMapper resultMapper){
this.resultMapper = resultMapper;
resetResultFields();
}
private ValueFactory getValueFactory(){
return this.valueFactory;
}
private void setValueFactory(ValueFactory valueFactory){
this.valueFactory = valueFactory;
}
static
private List updateNames(List fields, com.google.common.base.Function mapper){
for(F field : fields){
String name = field.getFieldName();
String mappedName = mapper.apply(name);
if(mappedName != null && !Objects.equals(mappedName, name)){
field.setName(mappedName);
}
}
return fields;
}
static
private VerificationBatch parseModelVerification(ModelVerification modelVerification){
VerificationBatch result = new VerificationBatch();
VerificationFields verificationFields = modelVerification.requireVerificationFields();
for(VerificationField verificationField : verificationFields){
result.put(verificationField.requireField(), verificationField);
}
InlineTable inlineTable = modelVerification.requireInlineTable();
Table table = InlineTableUtil.getContent(inlineTable);
List> records = new ArrayList<>();
Set rowKeys = table.rowKeySet();
for(Integer rowKey : rowKeys){
Map row = table.row(rowKey);
Map record = new LinkedHashMap<>();
for(VerificationField verificationField : verificationFields){
String fieldName = verificationField.requireField();
String column = verificationField.getColumn();
if(column == null){
column = fieldName;
} // End if
if(!row.containsKey(column)){
continue;
}
record.put(fieldName, row.get(column));
}
records.add(record);
}
Integer recordCount = modelVerification.getRecordCount();
if(recordCount != null && recordCount != records.size()){
throw new InvalidElementException(modelVerification);
}
result.setRecords(records);
return result;
}
static
private class VerificationBatch extends LinkedHashMap {
private List> records = null;
public List> getRecords(){
return this.records;
}
private void setRecords(List> records){
this.records = records;
}
}
}