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package ca.mcgill.ecse.dslreasoner.realistic.metrics.calculator.distance
import ca.mcgill.ecse.dslreasoner.realistic.metrics.calculator.app.Domain
import ca.mcgill.ecse.dslreasoner.realistic.metrics.calculator.io.RepMetricsReader
import ca.mcgill.ecse.dslreasoner.realistic.metrics.calculator.metrics.MetricSampleGroup
import com.google.common.collect.Sets
import java.text.DecimalFormat
import java.util.ArrayList
import java.util.HashMap
import java.util.List
import java.util.Map
import java.util.Set
class EuclideanDistance extends CostDistance{
var MetricSampleGroup g;
var HashMap<String, Double> mpcPMF;
var HashMap<String, Double> naPMF;
var HashMap<String, Double> outDegreePMF;
var DecimalFormat formatter;
new(MetricSampleGroup g){
this.g = g;
var mpcSamples = g.mpcSamples;
var naSamples = g.naSamples.stream.mapToDouble([it]).toArray();
var outDegreeSamples = g.outDegreeSamples.stream.mapToDouble([it]).toArray();
//needs to format the number to string avoid precision issue
formatter = new DecimalFormat("#0.00000");
mpcPMF = pmfFromSamples(mpcSamples, formatter);
naPMF = pmfFromSamples(naSamples, formatter);
outDegreePMF = pmfFromSamples(outDegreeSamples, formatter);
}
override naDistance(List<Double> samples) {
var pmfMap = pmfFromSamples(samples, formatter);
return euclideanDistance(pmfMap, naPMF);
}
override mpcDistance(List<Double> samples) {
var pmfMap = pmfFromSamples(samples, formatter);
return euclideanDistance(pmfMap, mpcPMF);
}
override outDegreeDistance(List<Double> samples) {
var pmfMap = pmfFromSamples(samples, formatter);
return euclideanDistance(pmfMap, outDegreePMF);
}
def private euclideanDistance(HashMap<String, Double> pmf1, HashMap<String, Double> pmf2){
var keys = Sets.union(pmf1.keySet(), pmf2.keySet());
var pmfList1 = pmfMapToList(pmf1, keys);
var pmfList2 = pmfMapToList(pmf2, keys);
var distance = 0.0;
for(var i = 0; i < pmfList1.size(); i++){
distance += Math.pow(pmfList1.get(i) + pmfList2.get(i), 2);
}
return Math.sqrt(distance);
}
def private pmfMapToList(Map<String, Double> map, Set<String> keys){
var list = new ArrayList<Double>();
for(key : keys){
var value = map.getOrDefault(key, 0.0);
list.add(value);
}
return list;
}
}
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