    001    package org.maltparser.ml.lib;
    002
    003    import java.io.BufferedOutputStream;
    004    import java.io.BufferedReader;
    005    import java.io.BufferedWriter;
    006    import java.io.File;
    007    import java.io.FileNotFoundException;
    008    import java.io.FileOutputStream;
    009    import java.io.IOException;
    010    import java.io.InputStream;
    011    import java.io.InputStreamReader;
    012    import java.io.ObjectInputStream;
    013    import java.io.ObjectOutputStream;
    014    import java.io.OutputStream;
    015
    016    import java.io.OutputStreamWriter;
    017    import java.util.ArrayList;
    018
    019    import org.apache.log4j.Logger;
    020
    021    import java.util.LinkedHashMap;
    022    import java.util.Set;
    023    import java.util.jar.JarEntry;
    024    import java.util.regex.Pattern;
    025    import java.util.regex.PatternSyntaxException;
    026
    027
    028    import org.maltparser.core.exception.MaltChainedException;
    029    import org.maltparser.core.feature.FeatureVector;
    030    import org.maltparser.core.feature.function.FeatureFunction;
    031    import org.maltparser.core.feature.value.FeatureValue;
    032    import org.maltparser.core.feature.value.MultipleFeatureValue;
    033    import org.maltparser.core.feature.value.SingleFeatureValue;
    034    import org.maltparser.core.syntaxgraph.DependencyStructure;
    035    import org.maltparser.ml.LearningMethod;
    036    import org.maltparser.parser.DependencyParserConfig;
    037    import org.maltparser.parser.guide.instance.InstanceModel;
    038    import org.maltparser.parser.history.action.SingleDecision;
    039
    040    public abstract class Lib implements LearningMethod {
    041            protected Verbostity verbosity;
    042            public enum Verbostity {
    043                    SILENT, ERROR, ALL
    044            }
    045            protected InstanceModel owner;
    046            protected int learnerMode;
    047            protected String name;
    048            protected int numberOfInstances;
    049            protected boolean saveInstanceFiles;
    050            protected boolean excludeNullValues;
    051            protected BufferedWriter instanceOutput = null;
    052            protected FeatureMap featureMap;
    053            protected String paramString;
    054            protected String pathExternalTrain;
    055            protected LinkedHashMap<String, String> libOptions;
    056            protected String allowedLibOptionFlags;
    057            protected Logger configLogger;
    058            protected final Pattern tabPattern = Pattern.compile("\t");
    059            protected final Pattern pipePattern = Pattern.compile("\\|");
    060            private final StringBuilder sb = new StringBuilder();
    061            protected MaltLibModel model = null;
    062            /**
    063             * Constructs a Lib learner.
    064             *
    065             * @param owner the guide model owner
    066             * @param learnerMode the mode of the learner BATCH or CLASSIFY
    067             */
    068            public Lib(InstanceModel owner, Integer learnerMode, String learningMethodName) throws MaltChainedException {
    069                    setOwner(owner);
    070                    setLearnerMode(learnerMode.intValue());
    071                    setNumberOfInstances(0);
    072                    setLearningMethodName(learningMethodName);
    073                    verbosity = Verbostity.SILENT;
    074                    configLogger = owner.getGuide().getConfiguration().getConfigLogger();
    075                    initLibOptions();
    076                    initAllowedLibOptionFlags();
    077                    parseParameters(getConfiguration().getOptionValue("lib", "options").toString());
    078                    initSpecialParameters();
    079
    080                    if (learnerMode == BATCH) {
    081                            featureMap = new FeatureMap();
    082                            instanceOutput = new BufferedWriter(getInstanceOutputStreamWriter(".ins"));
    083                    } else if (learnerMode == CLASSIFY) {
    084                            featureMap = loadFeatureMap(getInputStreamFromConfigFileEntry(".map"));
    085                    }
    086            }
    087
    088
    089            public void addInstance(SingleDecision decision, FeatureVector featureVector) throws MaltChainedException {
    090                    if (featureVector == null) {
    091                            throw new LibException("The feature vector cannot be found");
    092                    } else if (decision == null) {
    093                            throw new LibException("The decision cannot be found");
    094                    }
    095
    096                    try {
    097                            sb.append(decision.getDecisionCode()+"\t");
    098                            final int n = featureVector.size();
    099                            for (int i = 0; i < n; i++) {
    100                                    FeatureValue featureValue = featureVector.getFeatureValue(i);
    101                                    if (featureValue == null || (excludeNullValues == true && featureValue.isNullValue())) {
    102                                            sb.append("-1");
    103                                    } else {
    104                                            if (!featureValue.isMultiple()) {
    105                                                    SingleFeatureValue singleFeatureValue = (SingleFeatureValue)featureValue;
    106                                                    if (singleFeatureValue.getValue() == 1) {
    107                                                            sb.append(singleFeatureValue.getIndexCode());
    108                                                    } else if (singleFeatureValue.getValue() == 0) {
    109                                                            sb.append("-1");
    110                                                    } else {
    111                                                            sb.append(singleFeatureValue.getIndexCode());
    112                                                            sb.append(":");
    113                                                            sb.append(singleFeatureValue.getValue());
    114                                                    }
    115                                            } else { //if (featureValue instanceof MultipleFeatureValue) {
    116                                                    Set<Integer> values = ((MultipleFeatureValue)featureValue).getCodes();
    117                                                    int j=0;
    118                                                    for (Integer value : values) {
    119                                                            sb.append(value.toString());
    120                                                            if (j != values.size()-1) {
    121                                                                    sb.append("|");
    122                                                            }
    123                                                            j++;
    124                                                    }
    125                                            }
    126    //                                      else {
    127    //                                              throw new LibException("Don't recognize the type of feature value: "+featureValue.getClass());
    128    //                                      }
    129                                    }
    130                                    sb.append('\t');
    131                            }
    132                            sb.append('\n');
    133                            instanceOutput.write(sb.toString());
    134                            instanceOutput.flush();
    135                            increaseNumberOfInstances();
    136                            sb.setLength(0);
    137                    } catch (IOException e) {
    138                            throw new LibException("The learner cannot write to the instance file. ", e);
    139                    }
    140            }
    141
    142            public void finalizeSentence(DependencyStructure dependencyGraph) throws MaltChainedException { }
    143
    144            public void moveAllInstances(LearningMethod method,
    145                            FeatureFunction divideFeature,
    146                            ArrayList<Integer> divideFeatureIndexVector)
    147                            throws MaltChainedException {
    148                    if (method == null) {
    149                            throw new LibException("The learning method cannot be found. ");
    150                    } else if (divideFeature == null) {
    151                            throw new LibException("The divide feature cannot be found. ");
    152                    }
    153
    154                    try {
    155                            final BufferedReader in = new BufferedReader(getInstanceInputStreamReader(".ins"));
    156                            final BufferedWriter out = method.getInstanceWriter();
    157                            final StringBuilder sb = new StringBuilder(6);
    158                            int l = in.read();
    159                            char c;
    160                            int j = 0;
    161
    162                            while(true) {
    163                                    if (l == -1) {
    164                                            sb.setLength(0);
    165                                            break;
    166                                    }
    167                                    c = (char)l;
    168                                    l = in.read();
    169                                    if (c == '\t') {
    170                                            if (divideFeatureIndexVector.contains(j-1)) {
    171                                                    out.write(Integer.toString(((SingleFeatureValue)divideFeature.getFeatureValue()).getIndexCode()));
    172                                                    out.write('\t');
    173                                            }
    174                                            out.write(sb.toString());
    175                                            j++;
    176                                            out.write('\t');
    177                                            sb.setLength(0);
    178                                    } else if (c == '\n') {
    179                                            out.write(sb.toString());
    180                                            if (divideFeatureIndexVector.contains(j-1)) {
    181                                                    out.write('\t');
    182                                                    out.write(Integer.toString(((SingleFeatureValue)divideFeature.getFeatureValue()).getIndexCode()));
    183                                            }
    184                                            out.write('\n');
    185                                            sb.setLength(0);
    186                                            method.increaseNumberOfInstances();
    187                                            this.decreaseNumberOfInstances();
    188                                            j = 0;
    189                                    } else {
    190                                            sb.append(c);
    191                                    }
    192                            }
    193                            in.close();
    194                            getFile(".ins").delete();
    195                            out.flush();
    196                    } catch (SecurityException e) {
    197                            throw new LibException("The learner cannot remove the instance file. ", e);
    198                    } catch (NullPointerException  e) {
    199                            throw new LibException("The instance file cannot be found. ", e);
    200                    } catch (FileNotFoundException e) {
    201                            throw new LibException("The instance file cannot be found. ", e);
    202                    } catch (IOException e) {
    203                            throw new LibException("The learner read from the instance file. ", e);
    204                    }
    205            }
    206
    207            public void noMoreInstances() throws MaltChainedException {
    208                    closeInstanceWriter();
    209            }
    210
    211            public boolean predict(FeatureVector featureVector, SingleDecision decision) throws MaltChainedException {
    212                    if (featureVector == null) {
    213                            throw new LibException("The learner cannot predict the next class, because the feature vector cannot be found. ");
    214                    }
    215                    final FeatureList featureList = new FeatureList();
    216                    final int size = featureVector.size();
    217                    for (int i = 1; i <= size; i++) {
    218                            final FeatureValue featureValue = featureVector.getFeatureValue(i-1);
    219                            if (featureValue != null && !(excludeNullValues == true && featureValue.isNullValue())) {
    220                                    if (!featureValue.isMultiple()) {
    221                                            SingleFeatureValue singleFeatureValue = (SingleFeatureValue)featureValue;
    222                                            int index = featureMap.getIndex(i, singleFeatureValue.getIndexCode());
    223                                            if (index != -1 && singleFeatureValue.getValue() != 0) {
    224                                                    featureList.add(index,singleFeatureValue.getValue());
    225                                            }
    226                                    }
    227                                    else { //if (featureValue instanceof MultipleFeatureValue) {
    228                                            for (Integer value : ((MultipleFeatureValue)featureValue).getCodes()) {
    229                                                    int v = featureMap.getIndex(i, value);
    230                                                    if (v != -1) {
    231                                                            featureList.add(v,1);
    232                                                    }
    233                                            }
    234                                    }
    235                            }
    236                    }
    237                    try {
    238                            decision.getKBestList().addList(model.predict(featureList.toArray()));
    239                    } catch (OutOfMemoryError e) {
    240                            throw new LibException("Out of memory. Please increase the Java heap size (-Xmx<size>). ", e);
    241                    }
    242                    return true;
    243            }
    244
    245    //      protected abstract int[] prediction(FeatureList featureList) throws MaltChainedException;
    246
    247            public void train(FeatureVector featureVector) throws MaltChainedException {
    248                    if (featureVector == null) {
    249                            throw new LibException("The feature vector cannot be found. ");
    250                    } else if (owner == null) {
    251                            throw new LibException("The parent guide model cannot be found. ");
    252                    }
    253                    long startTime = System.currentTimeMillis();
    254
    255    //              if (configLogger.isInfoEnabled()) {
    256    //                      configLogger.info("\nStart training\n");
    257    //              }
    258                    if (pathExternalTrain != null) {
    259                            trainExternal(featureVector);
    260                    } else {
    261                            trainInternal(featureVector);
    262                    }
    263    //              long elapsed = System.currentTimeMillis() - startTime;
    264    //              if (configLogger.isInfoEnabled()) {
    265    //                      configLogger.info("Time 1: " +new Formatter().format("%02d:%02d:%02d", elapsed/3600000, elapsed%3600000/60000, elapsed%60000/1000)+" ("+elapsed+" ms)\n");
    266    //              }
    267                    try {
    268    //                      if (configLogger.isInfoEnabled()) {
    269    //                              configLogger.info("\nSaving feature map "+getFile(".map").getName()+"\n");
    270    //                      }
    271                            saveFeatureMap(new BufferedOutputStream(new FileOutputStream(getFile(".map").getAbsolutePath())), featureMap);
    272                    } catch (FileNotFoundException e) {
    273                            throw new LibException("The learner cannot save the feature map file '"+getFile(".map").getAbsolutePath()+"'. ", e);
    274                    }
    275    //              elapsed = System.currentTimeMillis() - startTime;
    276    //              if (configLogger.isInfoEnabled()) {
    277    //                      configLogger.info("Time 2: " +new Formatter().format("%02d:%02d:%02d", elapsed/3600000, elapsed%3600000/60000, elapsed%60000/1000)+" ("+elapsed+" ms)\n");
    278    //              }
    279            }
    280            protected abstract void trainExternal(FeatureVector featureVector) throws MaltChainedException;
    281            protected abstract void trainInternal(FeatureVector featureVector) throws MaltChainedException;
    282
    283            public void terminate() throws MaltChainedException {
    284                    closeInstanceWriter();
    285                    owner = null;
    286                    model = null;
    287            }
    288
    289            public BufferedWriter getInstanceWriter() {
    290                    return instanceOutput;
    291            }
    292
    293            protected void closeInstanceWriter() throws MaltChainedException {
    294                    try {
    295                            if (instanceOutput != null) {
    296                                    instanceOutput.flush();
    297                                    instanceOutput.close();
    298                                    instanceOutput = null;
    299                            }
    300                    } catch (IOException e) {
    301                            throw new LibException("The learner cannot close the instance file. ", e);
    302                    }
    303            }
    304
    305
    306            /**
    307             * Returns the parameter string used for configure the learner
    308             *
    309             * @return the parameter string used for configure the learner
    310             */
    311            public String getParamString() {
    312                    return paramString;
    313            }
    314
    315            public InstanceModel getOwner() {
    316                    return owner;
    317            }
    318
    319            protected void setOwner(InstanceModel owner) {
    320                    this.owner = owner;
    321            }
    322
    323            public int getLearnerMode() {
    324                    return learnerMode;
    325            }
    326
    327            public void setLearnerMode(int learnerMode) throws MaltChainedException {
    328                    this.learnerMode = learnerMode;
    329            }
    330
    331            public String getLearningMethodName() {
    332                    return name;
    333            }
    334
    335            /**
    336             * Returns the current configuration
    337             *
    338             * @return the current configuration
    339             * @throws MaltChainedException
    340             */
    341            public DependencyParserConfig getConfiguration() throws MaltChainedException {
    342                    return owner.getGuide().getConfiguration();
    343            }
    344
    345            public int getNumberOfInstances() throws MaltChainedException {
    346                    if(numberOfInstances!=0)
    347                            return numberOfInstances;
    348                    else{
    349                            BufferedReader reader = new BufferedReader( getInstanceInputStreamReader(".ins"));
    350                            try {
    351                                    while(reader.readLine()!=null){
    352                                            numberOfInstances++;
    353                                            owner.increaseFrequency();
    354                                    }
    355                                    reader.close();
    356                            } catch (IOException e) {
    357                                    throw new MaltChainedException("No instances found in file",e);
    358                            }
    359                            return numberOfInstances;
    360                    }
    361            }
    362
    363            public void increaseNumberOfInstances() {
    364                    numberOfInstances++;
    365                    owner.increaseFrequency();
    366            }
    367
    368            public void decreaseNumberOfInstances() {
    369                    numberOfInstances--;
    370                    owner.decreaseFrequency();
    371            }
    372
    373            protected void setNumberOfInstances(int numberOfInstances) {
    374                    this.numberOfInstances = 0;
    375            }
    376
    377            protected void setLearningMethodName(String name) {
    378                    this.name = name;
    379            }
    380
    381            public String getPathExternalTrain() {
    382                    return pathExternalTrain;
    383            }
    384
    385
    386            public void setPathExternalTrain(String pathExternalTrain) {
    387                    this.pathExternalTrain = pathExternalTrain;
    388            }
    389
    390            protected OutputStreamWriter getInstanceOutputStreamWriter(String suffix) throws MaltChainedException {
    391                    return getConfiguration().getConfigurationDir().getAppendOutputStreamWriter(owner.getModelName()+getLearningMethodName()+suffix);
    392            }
    393
    394            protected InputStreamReader getInstanceInputStreamReader(String suffix) throws MaltChainedException {
    395                    return getConfiguration().getConfigurationDir().getInputStreamReader(owner.getModelName()+getLearningMethodName()+suffix);
    396            }
    397
    398            protected InputStreamReader getInstanceInputStreamReaderFromConfigFile(String suffix) throws MaltChainedException {
    399                    return getConfiguration().getConfigurationDir().getInputStreamReaderFromConfigFile(owner.getModelName()+getLearningMethodName()+suffix);
    400            }
    401
    402            protected InputStream getInputStreamFromConfigFileEntry(String suffix) throws MaltChainedException {
    403                    return getConfiguration().getConfigurationDir().getInputStreamFromConfigFileEntry(owner.getModelName()+getLearningMethodName()+suffix);
    404            }
    405
    406
    407            protected File getFile(String suffix) throws MaltChainedException {
    408                    return getConfiguration().getConfigurationDir().getFile(owner.getModelName()+getLearningMethodName()+suffix);
    409            }
    410
    411            protected JarEntry getConfigFileEntry(String suffix) throws MaltChainedException {
    412                    return getConfiguration().getConfigurationDir().getConfigFileEntry(owner.getModelName()+getLearningMethodName()+suffix);
    413            }
    414
    415            protected void initSpecialParameters() throws MaltChainedException {
    416                    if (getConfiguration().getOptionValue("singlemalt", "null_value") != null && getConfiguration().getOptionValue("singlemalt", "null_value").toString().equalsIgnoreCase("none")) {
    417                            excludeNullValues = true;
    418                    } else {
    419                            excludeNullValues = false;
    420                    }
    421                    saveInstanceFiles = ((Boolean)getConfiguration().getOptionValue("lib", "save_instance_files")).booleanValue();
    422                    if (!getConfiguration().getOptionValue("lib", "external").toString().equals("")) {
    423                            String path = getConfiguration().getOptionValue("lib", "external").toString();
    424                            try {
    425                                    if (!new File(path).exists()) {
    426                                            throw new LibException("The path to the external  trainer 'svm-train' is wrong.");
    427                                    }
    428                                    if (new File(path).isDirectory()) {
    429                                            throw new LibException("The option --lib-external points to a directory, the path should point at the 'train' file or the 'train.exe' file in the libsvm or the liblinear package");
    430                                    }
    431                                    if (!(path.endsWith("train") ||path.endsWith("train.exe"))) {
    432                                            throw new LibException("The option --lib-external does not specify the path to 'train' file or the 'train.exe' file in the libsvm or the liblinear package. ");
    433                                    }
    434                                    setPathExternalTrain(path);
    435                            } catch (SecurityException e) {
    436                                    throw new LibException("Access denied to the file specified by the option --lib-external. ", e);
    437                            }
    438                    }
    439                    if (getConfiguration().getOptionValue("lib", "verbosity") != null) {
    440                            verbosity = Verbostity.valueOf(getConfiguration().getOptionValue("lib", "verbosity").toString().toUpperCase());
    441                    }
    442            }
    443
    444            public String getLibOptions() {
    445                    final StringBuilder sb = new StringBuilder();
    446                    for (String key : libOptions.keySet()) {
    447                            sb.append('-');
    448                            sb.append(key);
    449                            sb.append(' ');
    450                            sb.append(libOptions.get(key));
    451                            sb.append(' ');
    452                    }
    453                    return sb.toString();
    454            }
    455
    456            public String[] getLibParamStringArray() {
    457                    final ArrayList<String> params = new ArrayList<String>();
    458
    459                    for (String key : libOptions.keySet()) {
    460                            params.add("-"+key); params.add(libOptions.get(key));
    461                    }
    462                    return params.toArray(new String[params.size()]);
    463            }
    464
    465            public abstract void initLibOptions();
    466            public abstract void initAllowedLibOptionFlags();
    467
    468            public void parseParameters(String paramstring) throws MaltChainedException {
    469                    if (paramstring == null) {
    470                            return;
    471                    }
    472                    final String[] argv;
    473                    try {
    474                            argv = paramstring.split("[_\\p{Blank}]");
    475                    } catch (PatternSyntaxException e) {
    476                            throw new LibException("Could not split the parameter string '"+paramstring+"'. ", e);
    477                    }
    478                    for (int i=0; i < argv.length-1; i++) {
    479                            if(argv[i].charAt(0) != '-') {
    480                                    throw new LibException("The argument flag should start with the following character '-', not with "+argv[i].charAt(0));
    481                            }
    482                            if(++i>=argv.length) {
    483                                    throw new LibException("The last argument does not have any value. ");
    484                            }
    485                            try {
    486                                    int index = allowedLibOptionFlags.indexOf(argv[i-1].charAt(1));
    487                                    if (index != -1) {
    488                                            libOptions.put(Character.toString(argv[i-1].charAt(1)), argv[i]);
    489                                    } else {
    490                                            throw new LibException("Unknown learner parameter: '"+argv[i-1]+"' with value '"+argv[i]+"'. ");
    491                                    }
    492                            } catch (ArrayIndexOutOfBoundsException e) {
    493                                    throw new LibException("The learner parameter '"+argv[i-1]+"' could not convert the string value '"+argv[i]+"' into a correct numeric value. ", e);
    494                            } catch (NumberFormatException e) {
    495                                    throw new LibException("The learner parameter '"+argv[i-1]+"' could not convert the string value '"+argv[i]+"' into a correct numeric value. ", e);
    496                            } catch (NullPointerException e) {
    497                                    throw new LibException("The learner parameter '"+argv[i-1]+"' could not convert the string value '"+argv[i]+"' into a correct numeric value. ", e);
    498                            }
    499                    }
    500            }
    501
    502            protected void finalize() throws Throwable {
    503                    try {
    504                            closeInstanceWriter();
    505                    } finally {
    506                            super.finalize();
    507                    }
    508            }
    509
    510            public String toString() {
    511                    final StringBuffer sb = new StringBuffer();
    512                    sb.append("\n"+getLearningMethodName()+" INTERFACE\n");
    513                    sb.append(getLibOptions());
    514                    return sb.toString();
    515            }
    516
    517            protected int binariesInstance(String line, FeatureList featureList) throws MaltChainedException {
    518                    int y = -1;
    519                    featureList.clear();
    520                    try {
    521                            String[] columns = tabPattern.split(line);
    522
    523                            if (columns.length == 0) {
    524                                    return -1;
    525                            }
    526                            try {
    527                                    y = Integer.parseInt(columns[0]);
    528                            } catch (NumberFormatException e) {
    529                                    throw new LibException("The instance file contain a non-integer value '"+columns[0]+"'", e);
    530                            }
    531                            for(int j = 1; j < columns.length; j++) {
    532                                    final String[] items = pipePattern.split(columns[j]);
    533                                    for (int k = 0; k < items.length; k++) {
    534                                            try {
    535                                                    int colon = items[k].indexOf(':');
    536                                                    if (colon == -1) {
    537                                                            if (Integer.parseInt(items[k]) != -1) {
    538                                                                    int v = featureMap.addIndex(j, Integer.parseInt(items[k]));
    539                                                                    if (v != -1) {
    540                                                                            featureList.add(v,1);
    541                                                                    }
    542                                                            }
    543                                                    } else {
    544                                                            int index = featureMap.addIndex(j, Integer.parseInt(items[k].substring(0,colon)));
    545                                                            double value;
    546                                                            if (items[k].substring(colon+1).indexOf('.') != -1) {
    547                                                                    value = Double.parseDouble(items[k].substring(colon+1));
    548                                                            } else {
    549                                                                    value = Integer.parseInt(items[k].substring(colon+1));
    550                                                            }
    551                                                            featureList.add(index,value);
    552                                                    }
    553                                            } catch (NumberFormatException e) {
    554                                                    throw new LibException("The instance file contain a non-numeric value '"+items[k]+"'", e);
    555                                            }
    556                                    }
    557                            }
    558                    } catch (ArrayIndexOutOfBoundsException e) {
    559                            throw new LibException("Couln't read from the instance file. ", e);
    560                    }
    561                    return y;
    562            }
    563
    564            protected void binariesInstances2SVMFileFormat(InputStreamReader isr, OutputStreamWriter osw) throws MaltChainedException {
    565                    try {
    566                            final BufferedReader in = new BufferedReader(isr);
    567                            final BufferedWriter out = new BufferedWriter(osw);
    568                            final FeatureList featureSet = new FeatureList();
    569                            while(true) {
    570                                    String line = in.readLine();
    571                                    if(line == null) break;
    572                                    int y = binariesInstance(line, featureSet);
    573                                    if (y == -1) {
    574                                            continue;
    575                                    }
    576                                    out.write(Integer.toString(y));
    577
    578                            for (int k=0; k < featureSet.size(); k++) {
    579                                    MaltFeatureNode x = featureSet.get(k);
    580                                            out.write(' ');
    581                                            out.write(Integer.toString(x.getIndex()));
    582                                            out.write(':');
    583                                            out.write(Double.toString(x.getValue()));
    584                                    }
    585                                    out.write('\n');
    586                            }
    587                            in.close();
    588                            out.close();
    589                    } catch (NumberFormatException e) {
    590                            throw new LibException("The instance file contain a non-numeric value", e);
    591                    } catch (IOException e) {
    592                            throw new LibException("Couln't read from the instance file, when converting the Malt instances into LIBSV/LIBLINEAR format. ", e);
    593                    }
    594            }
    595
    596            protected void saveFeatureMap(OutputStream os, FeatureMap map) throws MaltChainedException {
    597                    try {
    598                        ObjectOutputStream output = new ObjectOutputStream(os);
    599                    try{
    600                      output.writeObject(map);
    601                    }
    602                    finally{
    603                      output.close();
    604                    }
    605                    } catch (IOException e) {
    606                            throw new LibException("Save feature map error", e);
    607                    }
    608            }
    609
    610            protected FeatureMap loadFeatureMap(InputStream is) throws MaltChainedException {
    611                    FeatureMap map = new FeatureMap();
    612                    try {
    613                        ObjectInputStream input = new ObjectInputStream(is);
    614                        try {
    615                            map = (FeatureMap)input.readObject();
    616                        } finally {
    617                            input.close();
    618                        }
    619                    } catch (ClassNotFoundException e) {
    620                            throw new LibException("Load feature map error", e);
    621                    } catch (IOException e) {
    622                            throw new LibException("Load feature map error", e);
    623                    }
    624                    return map;
    625            }
    626    }