@Override
public final void doWork() throws OperatorException {
ExampleSet inputExampleSet = exampleSetInput.getData(ExampleSet.class);
ExampleSet applySet = null;
// check for needed copy of original exampleset
if (originalOutput.isConnected() && writesIntoExistingData()) {
int type = DataRowFactory.TYPE_DOUBLE_ARRAY;
if (inputExampleSet.getExampleTable() instanceof MemoryExampleTable) {
DataRowReader dataRowReader = inputExampleSet.getExampleTable().getDataRowReader();
if (dataRowReader.hasNext()) {
type = dataRowReader.next().getType();
}
}
// check if type is supported to be copied
if (type >= 0) {
applySet = MaterializeDataInMemory.materializeExampleSet(inputExampleSet, type);
}
}
if (applySet == null) applySet = (ExampleSet) inputExampleSet.clone();
// we apply on the materialized data, because writing can't take place in views anyway.
ExampleSet result = apply(applySet);
originalOutput.deliver(inputExampleSet);
exampleSetOutput.deliver(result);
}
@Override
public ExampleSet apply(ExampleSet exampleSet) throws OperatorException {
int size = exampleSet.size();
// cannot bootstrap without any examples
if (size < 1) {
throw new UserError(this, 117);
}
RandomGenerator random = RandomGenerator.getRandomGenerator(this);
switch (getParameterAsInt(PARAMETER_SAMPLE)) {
case SAMPLE_ABSOLUTE:
size = getParameterAsInt(PARAMETER_SAMPLE_SIZE);
break;
case SAMPLE_RELATIVE:
size = (int) Math.round(exampleSet.size() * getParameterAsDouble(PARAMETER_SAMPLE_RATIO));
break;
}
int[] mapping = null;
if (getParameterAsBoolean(PARAMETER_USE_WEIGHTS)
&& exampleSet.getAttributes().getWeight() != null) {
mapping = MappedExampleSet.createWeightedBootstrappingMapping(exampleSet, size, random);
} else {
mapping = MappedExampleSet.createBootstrappingMapping(exampleSet, size, random);
}
// create and materialize example set
ExampleSet mappedExampleSet = new MappedExampleSet(exampleSet, mapping, true);
if (getCompatibilityLevel().isAbove(VERSION_6_4_0)) {
int type = DataRowFactory.TYPE_DOUBLE_ARRAY;
if (exampleSet.size() > 0) {
type = exampleSet.getExampleTable().getDataRow(0).getType();
}
mappedExampleSet = MaterializeDataInMemory.materializeExampleSet(mappedExampleSet, type);
}
return mappedExampleSet;
}