validate.cpp
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#include <QFutureSynchronizer>
#include <QtConcurrentRun>
#include <openbr/openbr_plugin.h>
#include <openbr/core/qtutils.h>
namespace br
{
/*!
* \ingroup transforms
* \brief Cross validate a trainable transform.
* \author Josh Klontz \cite jklontz
*/
class CrossValidateTransform : public MetaTransform
{
Q_OBJECT
Q_PROPERTY(QString description READ get_description WRITE set_description RESET reset_description STORED false)
BR_PROPERTY(QString, description, "Identity")
QList<br::Transform*> transforms;
void train(const TemplateList &data)
{
int numPartitions = 0;
QList<int> partitions; partitions.reserve(data.size());
foreach (const File &file, data.files()) {
partitions.append(file.get<int>("Cross_Validation_Partition", 0));
numPartitions = std::max(numPartitions, partitions.last()+1);
}
while (transforms.size() < numPartitions)
transforms.append(make(description));
if (numPartitions < 2) {
transforms.first()->train(data);
return;
}
QFutureSynchronizer<void> futures;
for (int i=0; i<numPartitions; i++) {
TemplateList partitionedData = data;
for (int j=partitionedData.size()-1; j>=0; j--)
// Remove all templates from partition i
if (partitions[j] == i)
partitionedData.removeAt(j);
// Train on the remaining templates
if (Globals->parallelism) futures.addFuture(QtConcurrent::run(transforms[i], &Transform::train, partitionedData));
else transforms[i]->train(partitionedData);
}
QtUtils::releaseAndWait(futures);
}
void project(const Template &src, Template &dst) const
{
transforms[src.file.get<int>("Cross_Validation_Partition", 0)]->project(src, dst);
}
void store(QDataStream &stream) const
{
stream << transforms.size();
foreach (Transform *transform, transforms)
transform->store(stream);
}
void load(QDataStream &stream)
{
int numTransforms;
stream >> numTransforms;
while (transforms.size() < numTransforms)
transforms.append(make(description));
foreach (Transform *transform, transforms)
transform->load(stream);
}
};
BR_REGISTER(Transform, CrossValidateTransform)
/*!
* \ingroup distances
* \brief Cross validate a distance metric.
* \author Josh Klontz \cite jklontz
*/
class CrossValidateDistance : public Distance
{
Q_OBJECT
float compare(const Template &a, const Template &b) const
{
const int partitionA = a.file.get<int>("Cross_Validation_Partition", 0);
const int partitionB = b.file.get<int>("Cross_Validation_Partition", 0);
return (partitionA != partitionB) ? -std::numeric_limits<float>::max() : 0;
}
};
BR_REGISTER(Distance, CrossValidateDistance)
/*!
* \ingroup distances
* \brief Checks target metadata against filters.
* \author Josh Klontz \cite jklontz
*/
class FilterDistance : public Distance
{
Q_OBJECT
float compare(const Template &a, const Template &b) const
{
(void) b; // Query template isn't checked
foreach (const QString &key, Globals->filters.keys()) {
bool keep = false;
const QString metadata = a.file.get<QString>(key, "");
if (metadata.isEmpty() || Globals->filters[key].isEmpty()) continue;
foreach (const QString &value, Globals->filters[key]) {
if (metadata == value) {
keep = true;
break;
}
}
if (!keep) return -std::numeric_limits<float>::max();
}
return 0;
}
};
BR_REGISTER(Distance, FilterDistance)
/*!
* \ingroup distances
* \brief Checks target metadata against query metadata.
* \author Scott Klum \cite sklum
*/
class MetadataDistance : public Distance
{
Q_OBJECT
Q_PROPERTY(QStringList filters READ get_filters WRITE set_filters RESET reset_filters STORED false)
BR_PROPERTY(QStringList, filters, QStringList())
float compare(const Template &a, const Template &b) const
{
foreach (const QString &key, filters) {
const QString aValue = a.file.get<QString>(key, "");
const QString bValue = b.file.get<QString>(key, "");
if (aValue.isEmpty() || bValue.isEmpty()) continue;
bool keep = false;
if (aValue[0] == '(') /* Range */ {
QStringList values = aValue.split(',');
int age = values[0].mid(1).toInt();
values[1].chop(1);
int upperBound = values[1].toInt();
while (age <= upperBound) {
if (aValue == bValue) {
keep = true;
break;
}
}
}
else if (aValue == bValue) keep = true;
if (!keep) return -std::numeric_limits<float>::max();
}
return 0;
}
};
BR_REGISTER(Distance, MetadataDistance)
} // namespace br
#include "validate.moc"