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LocalSearch does not seem to benefit from any kind of paralleism and most time is spent in the initial transliterator/indexing step (which also doesn't get much faster with parallel processing)

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This commit is contained in:
Reinhard Pointner 2016-04-08 22:59:15 +00:00
parent 0fa1d0f26f
commit d5bacdcb23
1 changed files with 21 additions and 74 deletions
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95
source/net/filebot/web/LocalSearch.java
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@ -1,107 +1,54 @@
package net.filebot.web;
import static java.util.Collections.*;
import static java.util.Comparator.*;
import static java.util.stream.Collectors.*;
import static net.filebot.similarity.Normalization.*;
import java.util.AbstractList;
import java.util.AbstractMap.SimpleEntry;
import java.util.AbstractMap.SimpleImmutableEntry;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
import java.util.HashSet;
import java.util.List;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.stream.IntStream;
import com.ibm.icu.text.Transliterator;
import uk.ac.shef.wit.simmetrics.similaritymetrics.AbstractStringMetric;
import uk.ac.shef.wit.simmetrics.similaritymetrics.QGramsDistance;
import com.ibm.icu.text.Transliterator;
public class LocalSearch<T> {
private static final ExecutorService localThreadPool = Executors.newWorkStealingPool();
private final AbstractStringMetric metric = new QGramsDistance();
private AbstractStringMetric metric = new QGramsDistance();
private float resultMinimumSimilarity = 0.5f;
private int resultSetSize = 20;
private final Transliterator transliterator = Transliterator.getInstance("Any-Latin;Latin-ASCII;[:Diacritic:]remove");
private Transliterator transliterator = Transliterator.getInstance("Any-Latin;Latin-ASCII;[:Diacritic:]remove");
private final List<T> objects;
private final List<Set<String>> fields;
private List<T> objects;
private List<Set<String>> fields;
public LocalSearch(Collection<? extends T> data) {
objects = new ArrayList<T>(data);
fields = new ArrayList<Set<String>>(objects.size());
for (int i = 0; i < objects.size(); i++) {
fields.add(i, getFields(objects.get(i)));
}
fields = objects.stream().map(this::getFields).collect(toList());
}
public List<T> search(String query) throws ExecutionException, InterruptedException {
final String q = normalize(query);
List<Callable<Entry<T, Float>>> tasks = new ArrayList<Callable<Entry<T, Float>>>(objects.size());
public List<T> search(String q) throws ExecutionException, InterruptedException {
String query = normalize(q);
for (int i = 0; i < objects.size(); i++) {
final int index = i;
tasks.add(new Callable<Entry<T, Float>>() {
return IntStream.range(0, objects.size()).mapToObj(i -> {
T object = objects.get(i);
Set<String> field = fields.get(i);
@Override
public Entry<T, Float> call() throws Exception {
float similarity = 0;
boolean match = false;
boolean match = field.stream().anyMatch(it -> it.contains(query));
double similarity = field.stream().mapToDouble(it -> metric.getSimilarity(query, it)).max().orElse(0);
for (String field : fields.get(index)) {
match |= field.contains(q);
similarity = Math.max(metric.getSimilarity(q, field), similarity);
}
return match || similarity > resultMinimumSimilarity ? new SimpleEntry<T, Float>(objects.get(index), similarity) : null;
}
});
}
final List<Entry<T, Float>> resultSet = new ArrayList<Entry<T, Float>>(objects.size());
for (Future<Entry<T, Float>> entry : localThreadPool.invokeAll(tasks)) {
if (entry.get() != null) {
resultSet.add(entry.get());
}
if (Thread.interrupted()) {
throw new InterruptedException();
}
}
// sort by similarity descending (best matches first)
sort(resultSet, new Comparator<Entry<T, Float>>() {
@Override
public int compare(Entry<T, Float> o1, Entry<T, Float> o2) {
return o2.getValue().compareTo(o1.getValue());
}
});
// view for the first 20 search results
return new AbstractList<T>() {
@Override
public T get(int index) {
return resultSet.get(index).getKey();
}
@Override
public int size() {
return Math.min(resultSetSize, resultSet.size());
}
};
return match || similarity > resultMinimumSimilarity ? new SimpleImmutableEntry<T, Double>(object, similarity) : null;
}).filter(Objects::nonNull).sorted(reverseOrder(comparing(Entry::getValue))).limit(resultSetSize).map(Entry::getKey).collect(toList());
}
public void setResultMinimumSimilarity(float resultMinimumSimilarity) {