Revision: 52538
Author: daniel
Date: 2009-06-29 11:29:14 +0000 (Mon, 29 Jun 2009)
Log Message:
-----------
documenting filter architecture
Modified Paths:
--------------
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/AbstractIntegratorApp.java
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/FilterConceptAssociations.java
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/FilterConceptMappings.java
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/FilteredAssociationCursor.java
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/FilteredMappingCandidateCursor.java
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/BestMappingCandidateSelector.java
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateFilter.java
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateMultiScorer.java
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateScorer.java
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateSelector.java
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateSelectorFilter.java
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateThresholdFilter.java
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/UniqueMappingCandidateSelector.java
Added Paths:
-----------
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateFeatureScorer.java
Removed Paths:
-------------
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/ConceptAssociationFilter.java
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidatePropertyScorer.java
Modified:
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/AbstractIntegratorApp.java
===================================================================
---
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/AbstractIntegratorApp.java
2009-06-29 11:27:58 UTC (rev 52537)
+++
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/AbstractIntegratorApp.java
2009-06-29 11:29:14 UTC (rev 52538)
@@ -281,7 +281,9 @@
fsc = new TsvFeatureSetCursor(lines, chunker);
- if (sourceDescriptor.getSkipBadRows())
((TsvFeatureSetCursor)fsc).setParseErrorHandler( new
LoggingErrorHandler<ChunkingCursor, ParseException, PersistenceException>(out));
+ if (sourceDescriptor.getSkipBadRows()) {
+
((TsvFeatureSetCursor)fsc).setParseErrorHandler( new
LoggingErrorHandler<ChunkingCursor, ParseException, PersistenceException>(out));
+ }
if (fields!=null) {
if (sourceDescriptor.getSkipHeader())
((TsvFeatureSetCursor)fsc).readFields();
Modified:
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/FilterConceptAssociations.java
===================================================================
---
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/FilterConceptAssociations.java
2009-06-29 11:27:58 UTC (rev 52537)
+++
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/FilterConceptAssociations.java
2009-06-29 11:29:14 UTC (rev 52538)
@@ -1,9 +1,9 @@
package de.brightbyte.wikiword.integrator;
import de.brightbyte.data.cursor.DataCursor;
+import de.brightbyte.data.filter.Filter;
import de.brightbyte.wikiword.integrator.data.Association;
import de.brightbyte.wikiword.integrator.data.FilteredAssociationCursor;
-import de.brightbyte.wikiword.integrator.data.filter.ConceptAssociationFilter;
import de.brightbyte.wikiword.integrator.store.AssociationFeatureStoreBuilder;
public class FilterConceptAssociations extends BuildConceptAssociations {
@@ -28,7 +28,7 @@
}
- protected ConceptAssociationFilter
createAssociationFilter(FeatureSetSourceDescriptor sourceDescriptor) {
+ protected Filter<Association>
createAssociationFilter(FeatureSetSourceDescriptor sourceDescriptor) {
throw new UnsupportedOperationException("no implementations of
ConceptAssociationFilter are implemented yet."); //TODO: implement filters
}
Modified:
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/FilterConceptMappings.java
===================================================================
---
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/FilterConceptMappings.java
2009-06-29 11:27:58 UTC (rev 52537)
+++
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/FilterConceptMappings.java
2009-06-29 11:29:14 UTC (rev 52538)
@@ -19,7 +19,7 @@
import de.brightbyte.wikiword.integrator.data.MappingCandidates;
import
de.brightbyte.wikiword.integrator.data.filter.BestMappingCandidateSelector;
import de.brightbyte.wikiword.integrator.data.filter.MappingCandidateFilter;
-import
de.brightbyte.wikiword.integrator.data.filter.MappingCandidatePropertyScorer;
+import
de.brightbyte.wikiword.integrator.data.filter.MappingCandidateFeatureScorer;
import de.brightbyte.wikiword.integrator.data.filter.MappingCandidateScorer;
import de.brightbyte.wikiword.integrator.data.filter.MappingCandidateSelector;
import
de.brightbyte.wikiword.integrator.data.filter.MappingCandidateSelectorFilter;
@@ -78,7 +78,7 @@
}
if (filter==null && selector==null && scorer==null &&
accessor!=null) {
- scorer = new MappingCandidatePropertyScorer(accessor);
+ scorer = new MappingCandidateFeatureScorer(accessor);
}
if (filter==null && selector==null && scorer!=null) {
Modified:
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/FilteredAssociationCursor.java
===================================================================
---
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/FilteredAssociationCursor.java
2009-06-29 11:27:58 UTC (rev 52537)
+++
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/FilteredAssociationCursor.java
2009-06-29 11:29:14 UTC (rev 52538)
@@ -1,15 +1,15 @@
package de.brightbyte.wikiword.integrator.data;
import de.brightbyte.data.cursor.DataCursor;
+import de.brightbyte.data.filter.Filter;
import de.brightbyte.util.PersistenceException;
-import de.brightbyte.wikiword.integrator.data.filter.ConceptAssociationFilter;
public class FilteredAssociationCursor implements DataCursor<Association> {
protected DataCursor<Association> cursor;
- protected ConceptAssociationFilter filter;
+ protected Filter<Association> filter;
- public FilteredAssociationCursor(DataCursor<Association> cursor,
ConceptAssociationFilter filter) {
+ public FilteredAssociationCursor(DataCursor<Association> cursor,
Filter<Association> filter) {
if (filter==null) throw new NullPointerException();
if (cursor==null) throw new NullPointerException();
@@ -26,7 +26,7 @@
while (true) {
a = cursor.next();
if (a==null) return null;
- if (!filter.acceptAssociation(a)) continue;
+ if (!filter.matches(a)) continue;
break;
}
Modified:
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/FilteredMappingCandidateCursor.java
===================================================================
---
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/FilteredMappingCandidateCursor.java
2009-06-29 11:27:58 UTC (rev 52537)
+++
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/FilteredMappingCandidateCursor.java
2009-06-29 11:29:14 UTC (rev 52538)
@@ -7,7 +7,7 @@
import de.brightbyte.util.PersistenceException;
import
de.brightbyte.wikiword.integrator.data.filter.BestMappingCandidateSelector;
import de.brightbyte.wikiword.integrator.data.filter.MappingCandidateFilter;
-import
de.brightbyte.wikiword.integrator.data.filter.MappingCandidatePropertyScorer;
+import
de.brightbyte.wikiword.integrator.data.filter.MappingCandidateFeatureScorer;
import de.brightbyte.wikiword.integrator.data.filter.MappingCandidateScorer;
import de.brightbyte.wikiword.integrator.data.filter.MappingCandidateSelector;
import
de.brightbyte.wikiword.integrator.data.filter.MappingCandidateSelectorFilter;
@@ -27,11 +27,11 @@
}
public FilteredMappingCandidateCursor(DataCursor<MappingCandidates>
cursor, PropertyAccessor<FeatureSet, ? extends Number> accessor) {
- this(cursor, new MappingCandidatePropertyScorer(accessor));
+ this(cursor, new MappingCandidateFeatureScorer(accessor));
}
public FilteredMappingCandidateCursor(DataCursor<MappingCandidates>
cursor, PropertyAccessor<FeatureSet, ? extends Number> accessor, int threshold)
{
- this(cursor, new MappingCandidatePropertyScorer(accessor),
threshold);
+ this(cursor, new MappingCandidateFeatureScorer(accessor),
threshold);
}
public FilteredMappingCandidateCursor(DataCursor<MappingCandidates>
cursor, MappingCandidateScorer scorer) {
Modified:
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/BestMappingCandidateSelector.java
===================================================================
---
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/BestMappingCandidateSelector.java
2009-06-29 11:27:58 UTC (rev 52537)
+++
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/BestMappingCandidateSelector.java
2009-06-29 11:29:14 UTC (rev 52538)
@@ -3,6 +3,12 @@
import de.brightbyte.wikiword.integrator.data.FeatureSet;
import de.brightbyte.wikiword.integrator.data.MappingCandidates;
+/**
+ * MappingCandidateSelector selecting the candidate with the highest score, as
determined
+ * by a given MappingCandidateScorer.
+ *
+ * @author daniel
+ */
public class BestMappingCandidateSelector implements MappingCandidateSelector {
protected MappingCandidateScorer scorer;
Deleted:
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/ConceptAssociationFilter.java
===================================================================
---
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/ConceptAssociationFilter.java
2009-06-29 11:27:58 UTC (rev 52537)
+++
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/ConceptAssociationFilter.java
2009-06-29 11:29:14 UTC (rev 52538)
@@ -1,7 +0,0 @@
-package de.brightbyte.wikiword.integrator.data.filter;
-
-import de.brightbyte.wikiword.integrator.data.Association;
-
-public interface ConceptAssociationFilter {
- public boolean acceptAssociation(Association assoc);
-}
Copied:
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateFeatureScorer.java
(from rev 52334,
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidatePropertyScorer.java)
===================================================================
---
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateFeatureScorer.java
(rev 0)
+++
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateFeatureScorer.java
2009-06-29 11:29:14 UTC (rev 52538)
@@ -0,0 +1,41 @@
+package de.brightbyte.wikiword.integrator.data.filter;
+
+import de.brightbyte.abstraction.PropertyAccessor;
+import de.brightbyte.wikiword.integrator.data.FeatureSet;
+import de.brightbyte.wikiword.integrator.data.FeatureSets;
+
+/**
+ * MappingCandidateScorer that determins the score directly from each
FeatureSet's features,
+ * using a given accessor.
+ *
+ * @author daniel
+ */
+public class MappingCandidateFeatureScorer implements MappingCandidateScorer {
+
+ protected PropertyAccessor<FeatureSet, ? extends Number> accessor;
+
+ /**
+ * Creates a MappingCandidateFeatureScorer that uses the givenfeature's
value as the
+ * candidate's score.
+ *
+ * @param field feature
+ */
+ public MappingCandidateFeatureScorer(String feature) {
+ this(FeatureSets.fieldAccessor(feature, Number.class));
+ }
+
+ /**
+ * Creates a MappingCandidateFeatureScorer that determins the score
using the given accessor.
+ * @param field accessor
+ */
+ public MappingCandidateFeatureScorer(PropertyAccessor<FeatureSet, ?
extends Number> accessor) {
+ if (accessor==null) throw new NullPointerException();
+ this.accessor = accessor;
+ }
+
+ public int getCandidateScore(FeatureSet subject, FeatureSet candidate) {
+ Number score = accessor.getValue(candidate);
+ return score.intValue();
+ }
+
+}
Property changes on:
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateFeatureScorer.java
___________________________________________________________________
Added: svn:mergeinfo
+
Modified:
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateFilter.java
===================================================================
---
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateFilter.java
2009-06-29 11:27:58 UTC (rev 52537)
+++
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateFilter.java
2009-06-29 11:29:14 UTC (rev 52538)
@@ -5,6 +5,12 @@
import de.brightbyte.wikiword.integrator.data.FeatureSet;
import de.brightbyte.wikiword.integrator.data.MappingCandidates;
+/**
+ * Interface for filters that apply to the set of candidates in a
MappingCandidates object.
+ * Can be used to reduce the number of possible mappings for a given subject.
+ *
+ * @author daniel
+ */
public interface MappingCandidateFilter {
public Collection<FeatureSet> filterCandidates(MappingCandidates
candidates);
}
Modified:
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateMultiScorer.java
===================================================================
---
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateMultiScorer.java
2009-06-29 11:27:58 UTC (rev 52537)
+++
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateMultiScorer.java
2009-06-29 11:29:14 UTC (rev 52538)
@@ -6,6 +6,12 @@
import de.brightbyte.data.Functor2;
import de.brightbyte.wikiword.integrator.data.FeatureSet;
+/**
+ * MappingCandidateScorer that accumulates the scores from multiple
MappingCandidateScorers into a single score,
+ * using a aggregator functor (usually the sum or maximum, as implemented by
Functors.Integer.sum resp. Functors.Integer.max).
+ *
+ * @author daniel
+ */
public class MappingCandidateMultiScorer implements MappingCandidateScorer {
protected Collection<MappingCandidateScorer> scorers = new
ArrayList<MappingCandidateScorer>();
Deleted:
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidatePropertyScorer.java
===================================================================
---
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidatePropertyScorer.java
2009-06-29 11:27:58 UTC (rev 52537)
+++
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidatePropertyScorer.java
2009-06-29 11:29:14 UTC (rev 52538)
@@ -1,25 +0,0 @@
-package de.brightbyte.wikiword.integrator.data.filter;
-
-import de.brightbyte.abstraction.PropertyAccessor;
-import de.brightbyte.wikiword.integrator.data.FeatureSet;
-import de.brightbyte.wikiword.integrator.data.FeatureSets;
-
-public class MappingCandidatePropertyScorer implements MappingCandidateScorer {
-
- protected PropertyAccessor<FeatureSet, ? extends Number> accessor;
-
- public MappingCandidatePropertyScorer(String field) {
- this(FeatureSets.fieldAccessor(field, Number.class));
- }
-
- public MappingCandidatePropertyScorer(PropertyAccessor<FeatureSet, ?
extends Number> accessor) {
- if (accessor==null) throw new NullPointerException();
- this.accessor = accessor;
- }
-
- public int getCandidateScore(FeatureSet subject, FeatureSet candidate) {
- Number score = accessor.getValue(candidate);
- return score.intValue();
- }
-
-}
Modified:
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateScorer.java
===================================================================
---
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateScorer.java
2009-06-29 11:27:58 UTC (rev 52537)
+++
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateScorer.java
2009-06-29 11:29:14 UTC (rev 52538)
@@ -2,6 +2,12 @@
import de.brightbyte.wikiword.integrator.data.FeatureSet;
+/**
+ * Determines a score value for a mapping between two given FeatureSets, the
+ * subject and the candidate (object).
+ *
+ * @author daniel
+ */
public interface MappingCandidateScorer {
public int getCandidateScore(FeatureSet subject, FeatureSet candidate);
}
Modified:
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateSelector.java
===================================================================
---
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateSelector.java
2009-06-29 11:27:58 UTC (rev 52537)
+++
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateSelector.java
2009-06-29 11:29:14 UTC (rev 52538)
@@ -3,6 +3,20 @@
import de.brightbyte.wikiword.integrator.data.FeatureSet;
import de.brightbyte.wikiword.integrator.data.MappingCandidates;
+/**
+ * Selects a candidate from a set of MappingCandidates. Used to determin the
"best" mapping.
+ *
+ * @author daniel
+ */
public interface MappingCandidateSelector {
+
+ /**
+ * returns the "best" candidate from the given MappingCandidates
instance, according to
+ * whatever logic the implementation chooses. May also return null to
indicate that no
+ * suitable candidate was found.
+ *
+ * @param candidates
+ * @return the best candidate, or null to indicate that no sufficiently
good candidate was found.
+ */
public FeatureSet selectCandidate(MappingCandidates candidates);
}
Modified:
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateSelectorFilter.java
===================================================================
---
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateSelectorFilter.java
2009-06-29 11:27:58 UTC (rev 52537)
+++
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateSelectorFilter.java
2009-06-29 11:29:14 UTC (rev 52538)
@@ -6,6 +6,12 @@
import de.brightbyte.wikiword.integrator.data.FeatureSet;
import de.brightbyte.wikiword.integrator.data.MappingCandidates;
+/**
+ * MappingCandidateFilter using a MappingCandidateSelector to reduce the set
of
+ * candidate mappings to a single "best" candidate (or possibly none).
+ *
+ * @author daniel
+ */
public class MappingCandidateSelectorFilter implements MappingCandidateFilter {
protected MappingCandidateSelector selector;
Modified:
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateThresholdFilter.java
===================================================================
---
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateThresholdFilter.java
2009-06-29 11:27:58 UTC (rev 52537)
+++
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/MappingCandidateThresholdFilter.java
2009-06-29 11:29:14 UTC (rev 52538)
@@ -6,6 +6,12 @@
import de.brightbyte.wikiword.integrator.data.FeatureSet;
import de.brightbyte.wikiword.integrator.data.MappingCandidates;
+/**
+ * MappingCandidateFilter using a MappingCandidateScorer to reduce the set of
+ * candidate mappings to those who's score pass a given threshold.
+ *
+ * @author daniel
+ */
public class MappingCandidateThresholdFilter implements MappingCandidateFilter
{
protected MappingCandidateScorer scorer;
Modified:
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/UniqueMappingCandidateSelector.java
===================================================================
---
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/UniqueMappingCandidateSelector.java
2009-06-29 11:27:58 UTC (rev 52537)
+++
trunk/WikiWord/WikiWordIntegrator/src/main/java/de/brightbyte/wikiword/integrator/data/filter/UniqueMappingCandidateSelector.java
2009-06-29 11:29:14 UTC (rev 52538)
@@ -5,6 +5,12 @@
import de.brightbyte.wikiword.integrator.data.FeatureSet;
import de.brightbyte.wikiword.integrator.data.MappingCandidates;
+/**
+ * MappingCandidateSelector that only returns unique mapping candidates - that
is, it returns null
+ * if there is more than once candidate. If there is only one, that candidate
is returned.
+ *
+ * @author daniel
+ */
public class UniqueMappingCandidateSelector implements
MappingCandidateSelector {
public FeatureSet selectCandidate(MappingCandidates candidates) {
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