/**
* Constructor.
*
* @param user user whose model is created.
*/
public FeatureUserIntentModel(U user) {
Object2DoubleOpenHashMap<F> auxProb = new Object2DoubleOpenHashMap<>();
auxProb.defaultReturnValue(0.0);
int[] norm = {0};
totalData
.getUserPreferences(user)
.forEach(
iv -> {
featureData
.getItemFeatures(iv.id)
.forEach(
fv -> {
auxProb.addTo(fv.id, 1.0);
norm[0]++;
});
});
if (norm[0] == 0) {
norm[0] = featureData.numFeatures();
featureData.getAllFeatures().sequential().forEach(f -> auxProb.put(f, 1.0));
}
auxProb
.object2DoubleEntrySet()
.forEach(
e -> {
e.setValue(e.getDoubleValue() / norm[0]);
});
this.prob = auxProb;
}
@Override
public ItemAspectModel<I, F> getItemAspectModel(List<Tuple2od<I>> items) {
Object2DoubleOpenHashMap<F> probNorm = new Object2DoubleOpenHashMap<>();
items.forEach(
iv -> {
getItemIntents(iv.v1)
.forEach(
f -> {
if (iv.v2 > probNorm.getOrDefault(f, 0.0)) {
probNorm.put(f, iv.v2);
}
});
});
return (iv, f) -> (Math.pow(2, iv.v2 / probNorm.getDouble(f)) - 1) / 2.0;
}