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package com.expleague.ml.data.tools;
import com.expleague.commons.func.Computable;
import com.expleague.commons.math.Func;
import com.expleague.commons.math.Trans;
import com.expleague.commons.math.metrics.Metric;
import com.expleague.commons.math.metrics.impl.CosineDVectorMetric;
import com.expleague.commons.math.vectors.Mx;
import com.expleague.commons.math.vectors.Vec;
import com.expleague.commons.math.vectors.VecTools;
import com.expleague.commons.math.vectors.impl.vectors.ArrayVec;
import com.expleague.commons.seq.IntSeq;
import com.expleague.ml.data.set.VecDataSet;
import com.expleague.ml.func.FuncEnsemble;
import com.expleague.ml.func.FuncJoin;
import com.expleague.ml.loss.blockwise.BlockwiseMLLLogit;
import com.expleague.ml.loss.multiclass.MCMicroF1Score;
import com.expleague.ml.meta.items.QURLItem;
import com.expleague.ml.models.multiclass.JoinedBinClassModel;
import com.expleague.ml.models.multiclass.MCModel;
import com.expleague.commons.math.vectors.impl.mx.VecBasedMx;
import com.expleague.commons.text.StringUtils;
import com.expleague.commons.util.ArrayTools;
import com.expleague.commons.util.Pair;
import com.expleague.ml.func.Ensemble;
import com.expleague.ml.loss.L2;
import com.expleague.ml.loss.multiclass.util.ConfusionMatrix;
import gnu.trove.iterator.TIntIterator;
import gnu.trove.list.TDoubleList;
import gnu.trove.list.TIntList;
import gnu.trove.list.array.TIntArrayList;
import gnu.trove.list.linked.TIntLinkedList;
import gnu.trove.map.TIntIntMap;
import gnu.trove.map.TIntObjectMap;
import gnu.trove.map.hash.TIntIntHashMap;
import gnu.trove.map.hash.TIntObjectHashMap;
import java.io.IOException;
import java.util.Arrays;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import static java.lang.Math.max;
/**
* User: qdeee
* Date: 04.06.14
*/
public class MCTools {
public static int countClasses(final IntSeq target) {
int classesCount = 0;
for (int i = 0; i < target.length(); i++) {
classesCount = max(target.at(i) + 1, classesCount);
}
return classesCount;
}
/**
* calculate classes entries counts
* @param target normalized(!) target with class labels from {0,...,K-1}
* @return array with counts
*/
public static int[] classEntriesCounts(final IntSeq target) {
final int[] counts = new int[countClasses(target)];
for (int i = 0; i < target.length(); i++) {
counts[target.arr[i]]++;
}
return counts;
}
public static int classEntriesCount(final IntSeq target, final int classNo) {
int result = 0;
for (int i = 0; i < target.length(); i++) {
if (target.at(i) == classNo)
result++;
}
return result;
}
public static Vec extractClassForBinary(final IntSeq target, final int classNo) {
final Vec result = new ArrayVec(target.length());
for (int i = 0; i < target.length(); i++)
result.set(i, (target.at(i) == classNo) ? 1. : -1.);
return result;
}
/**
*
* @param target MC target with any classes labels
* @return classes labels corresponding their order (uniq)
*/
public static int[] getClassesLabels(final IntSeq target) {
final TIntList labels = new TIntArrayList();
for (int i = 0; i < target.length(); i++) {
final int label = target.at(i);
if (!labels.contains(label)) {
labels.add(label);
}
}
return labels.toArray();
}
public static int[] getClassLabels(final Vec target) {
final TIntList labels = new TIntArrayList();
for (int i = 0; i < target.length(); i++) {
final int label = target.at(i).intValue();
if (!labels.contains(label)) {
labels.add(label);
}
}
return labels.toArray();
}
/**
* Normalization of multiclass target. Target may contain any labels. Notice that error class (-1) will be mapped to the class K.
* Example: if target contains {10, 10, 6, 4, -1, -1} then result is {2, 2, 1, 0, 3, 3} and map will be filled {(4->0), (6->1), (10->2), (-1->3)}
* @param target Target vec with any class labels.
* @param labelsMap Empty map which will be filled here by pairs (label, normalizedLabel).
* @return new target with classes labels from {0..K}.
*/
public static IntSeq normalizeTarget(final IntSeq target, final TIntIntMap labelsMap) {
for (int i = 0; i < target.length(); i++) {
labelsMap.putIfAbsent(target.arr[i], 0);
}
labelsMap.remove(-1);
final int[] labels = labelsMap.keys();
Arrays.sort(labels);
for (int i = 0; i < labels.length; i++) {
labelsMap.put(labels[i], i);
}
labelsMap.put(-1, labels.length);
final int[] newTarget = new int[target.length()];
for (int i = 0; i < target.length(); i++) {
newTarget[i] = labelsMap.get(target.arr[i]);
}
return new IntSeq(newTarget);
}
public static TIntObjectMap splitClassesIdxs(final IntSeq target) {
final TIntObjectMap indexes = new TIntObjectHashMap();
for (int i = 0; i < target.length(); i++) {
final int label = target.at(i);
if (indexes.containsKey(label)) {
indexes.get(label).add(i);
}
else {
final TIntList newClassIdxs = new TIntLinkedList();
newClassIdxs.add(i);
indexes.put(label, newClassIdxs);
}
}
return indexes;
}
private static double normalizeRelevance(final double y) {
if (y <= 0.0)
return 0.;
// else if (y < 0.14)
// return 1.;
// else if (y < 0.41)
// return 2.;
// else if (y < 0.61)
// return 3.;
// else
// return 4.;
return 1.;
}
public static IntSeq transformRegressionToMC(final Vec regressionTarget, final int classCount, final TDoubleList borders) throws IOException {
final double[] target = regressionTarget.toArray();
final int[] idxs = ArrayTools.sequence(0, target.length);
ArrayTools.parallelSort(target, idxs);
if (borders.size() == 0) {
final double min = target[0];
final double max = target[target.length - 1];
final double delta = (max - min) / classCount;
for (int i = 0; i < classCount; i++) {
borders.add(delta * (i + 1));
}
}
final int[] resultTarget = new int[target.length];
int targetCursor = 0;
for (int borderCursor = 0; borderCursor < borders.size(); borderCursor++){
while (targetCursor < target.length && target[targetCursor] <= borders.get(borderCursor)) {
resultTarget[idxs[targetCursor]] = borderCursor;
targetCursor++;
}
}
return new IntSeq(resultTarget);
}
public static Pair loadRegressionAsMC(final String file, final int classCount, final TDoubleList borders) throws IOException{
final Pool pool = DataTools.loadFromFeaturesTxt(file);
return Pair.create(pool.vecData(), transformRegressionToMC(pool.target(L2.class).target, classCount, borders));
}
public static Mx createSimilarityMatrixParallels(final VecDataSet learn, final IntSeq target, final Metric metric) {
final ExecutorService executor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
final TIntObjectMap indexes = splitClassesIdxs(target);
final int k = indexes.keys().length;
final Mx S = new VecBasedMx(k, k);
for (int i = 0; i < k; i++) {
final TIntList classIdxsI = indexes.get(i);
for (int j = i; j < k; j++) {
final TIntList classIdxsJ = indexes.get(j);
final int iCopy = i;
final int jCopy = j;
executor.submit(new Runnable() {
@Override
public void run() {
double value = 0.;
for (final TIntIterator iterI = classIdxsI.iterator(); iterI.hasNext(); ) {
final int i1 = iterI.next();
for (final TIntIterator iterJ = classIdxsJ.iterator(); iterJ.hasNext(); ) {
final int i2 = iterJ.next();
value += 1 - metric.distance(learn.data().row(i1), learn.data().row(i2));
}
}
value /= classIdxsI.size() * classIdxsJ.size();
S.set(iCopy, jCopy, value);
S.set(jCopy, iCopy, value);
}
});
}
}
executor.shutdown();
try {
executor.awaitTermination(1000, TimeUnit.HOURS);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
return S;
}
public static Mx createSimilarityMatrix(final VecDataSet learn, final IntSeq target) {
final TIntObjectMap indexes = splitClassesIdxs(target);
final Metric metric = new CosineDVectorMetric();
final int k = indexes.keys().length;
final Mx S = new VecBasedMx(k, k);
for (int i = 0; i < k; i++) {
final TIntList classIdxsI = indexes.get(i);
for (int j = i; j < k; j++) {
final TIntList classIdxsJ = indexes.get(j);
double value = 0.;
for (final TIntIterator iterI = classIdxsI.iterator(); iterI.hasNext(); ) {
final int i1 = iterI.next();
for (final TIntIterator iterJ = classIdxsJ.iterator(); iterJ.hasNext(); ) {
final int i2 = iterJ.next();
value += 1 - metric.distance(learn.data().row(i1), learn.data().row(i2));
}
}
value /= classIdxsI.size() * classIdxsJ.size();
S.set(i, j, value);
S.set(j, i, value);
}
System.out.println("class " + i + " is finished!");
}
return S;
}
public static String evalModel(final MCModel model, final Pool ds, final String prefixComment, final boolean oneLine) {
final Vec predict = model.bestClassAll(ds.vecData().data());
final TIntIntMap labelsMap = new TIntIntHashMap();
final ConfusionMatrix confusionMatrix = new ConfusionMatrix(
normalizeTarget(ds.target(BlockwiseMLLLogit.class).labels(), labelsMap),
mapTarget(VecTools.toIntSeq(predict), labelsMap)
);
if (oneLine) {
return prefixComment + confusionMatrix.debug();
} else {
return "\n==========" + prefixComment +
StringUtils.repeatWithDelimeter("", "=", 100 - 10 - prefixComment.length()) + "\n" +
confusionMatrix.toSummaryString() + "\n" +
confusionMatrix.toClassDetailsString() +
StringUtils.repeatWithDelimeter("", "=", 100);
}
}
//only for FuncJoin models
public static FuncJoin joinBoostingResult(final Ensemble ensemble) {
if (ensemble.last() instanceof FuncJoin) {
final int modelsCount = ensemble.ydim();
final Func[] joinedModels = new Func[modelsCount];
final Func[][] transpose = new Func[modelsCount][ensemble.size()];
for (int iter = 0; iter < ensemble.size(); iter++) {
final FuncJoin model = (FuncJoin) ensemble.models[iter];
final Func[] sourceFunctions = model.dirs();
for (int c = 0; c < modelsCount; c++) {
transpose[c][iter] = sourceFunctions[c];
}
}
for (int i = 0; i < joinedModels.length; i++) {
joinedModels[i] = new FuncEnsemble(transpose[i], ensemble.weights);
}
return new FuncJoin(joinedModels);
}
else
throw new ClassCastException("Ensemble object does not contain FuncJoin objects");
}
public static IntSeq mapTarget(final IntSeq intTarget, final TIntIntMap mapping) {
final int[] mapped = new int[intTarget.length()];
for (int i = 0; i < intTarget.length(); i++) {
mapped[i] = mapping.get(intTarget.at(i));
}
return new IntSeq(mapped);
}
public static void makeOneVsRestReport(final Pool learn, final Pool test, final JoinedBinClassModel joinedBinClassModel, final int period) {
if (!(joinedBinClassModel.getInternModel().dirs[0] instanceof FuncEnsemble)) {
throw new IllegalArgumentException("Provided model must contain array of FuncEnsemble objects");
}
final IntSeq learnLabels = learn.target(MCMicroF1Score.class).labels();
final IntSeq testLabels = test.target(MCMicroF1Score.class).labels();
final FuncEnsemble[] perClassModels = ArrayTools.map(joinedBinClassModel.getInternModel().dirs, FuncEnsemble.class, new Computable() {
@Override
public FuncEnsemble compute(final Trans argument) {
return (FuncEnsemble) argument;
}
});
final int ensembleSize = perClassModels[0].size();
final int classesCount = perClassModels.length;
final Mx learnCache = new VecBasedMx(learn.size(), classesCount);
final Mx testCache = new VecBasedMx(test.size(), classesCount);
for (int t = 0; t < ensembleSize; t += period) {
final Func[] functions = new Func[classesCount];
for (int c = 0; c < classesCount; c++) {
functions[c] = new FuncEnsemble<>(
Arrays.copyOfRange(perClassModels[c].models, t, Math.min(t + period, ensembleSize), Func[].class),
perClassModels[c].weights.sub(0, t)
);
}
final FuncJoin deltaFuncJoin = new FuncJoin(functions);
VecTools.append(learnCache, deltaFuncJoin.transAll(learn.vecData().data()));
VecTools.append(testCache, deltaFuncJoin.transAll(test.vecData().data()));
final IntSeq learnPredict = convertTransOneVsRestResults(learnCache);
final IntSeq testPredict = convertTransOneVsRestResults(testCache);
final ConfusionMatrix learnConfusionMatrix = new ConfusionMatrix(learnLabels, learnPredict);
final ConfusionMatrix testConfusionMatrix = new ConfusionMatrix(testLabels, testPredict);
System.out.print("\t" + learnConfusionMatrix.oneLineReport());
System.out.print("\t" + testConfusionMatrix.oneLineReport());
System.out.println();
}
}
private static IntSeq convertTransOneVsRestResults(final Mx trans) {
final int[] result = new int[trans.rows()];
for (int i = 0; i < trans.rows(); i++) {
final Vec row = trans.row(i);
result[i] = VecTools.argmax(row);
}
return new IntSeq(result);
}
}
