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CrossTransform.java
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/
CrossTransform.java
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package com.airbnb.aerosolve.core.transforms;
import com.airbnb.aerosolve.core.FeatureVector;
import com.typesafe.config.Config;
import java.util.HashSet;
import java.util.Set;
import java.util.Map;
/**
* Created by hector_yee on 8/25/14.
* Takes the cross product of stringFeatures named in field1 and field2
* and places it in a stringFeature with family name specified in output.
*/
public class CrossTransform extends Transform {
private String fieldName1;
private String fieldName2;
private String outputName;
@Override
public void configure(Config config, String key) {
fieldName1 = config.getString(key + ".field1");
fieldName2 = config.getString(key + ".field2");
outputName = config.getString(key + ".output");
}
@Override
public void doTransform(FeatureVector featureVector) {
Map<String, Set<String>> stringFeatures = featureVector.getStringFeatures();
if (stringFeatures == null) return;
Set<String> set1 = stringFeatures.get(fieldName1);
if (set1 == null || set1.isEmpty()) return;
Set<String> set2 = stringFeatures.get(fieldName2);
if (set2 == null || set2.isEmpty()) return;
Set<String> output = stringFeatures.get(outputName);
if (output == null) {
output = new HashSet<>();
stringFeatures.put(outputName, output);
}
cross(set1, set2, output);
}
public static void cross(Set<String> set1, Set<String> set2, Set<String> output) {
for (String s1 : set1) {
String prefix = s1 + '^';
for (String s2 : set2) {
output.add(prefix + s2);
}
}
}
}