Example usage for org.apache.lucene.search.similarities LMDirichletSimilarity LMDirichletSimilarity

Introduction

In this page you can find the example usage for org.apache.lucene.search.similarities LMDirichletSimilarity LMDirichletSimilarity.

Prototype

public LMDirichletSimilarity(CollectionModel collectionModel) 

Source Link

Document

Instantiates the similarity with the default μ value of 2000.

Usage

From source file:cc.twittertools.search.api.TrecSearchHandler.java

License:Apache License

public TrecSearchHandler(File indexPath, @Nullable Map<String, String> credentials) throws IOException {
    Preconditions.checkNotNull(indexPath);
    Preconditions.checkArgument(indexPath.exists());

    // Can be null, in which case we don't check for credentials.
    this.credentials = credentials;

    IndexReader reader = DirectoryReader.open(FSDirectory.open(indexPath));
    searcher = new IndexSearcher(reader);
    searcher.setSimilarity(new LMDirichletSimilarity(2500.0f));
}

---

From source file:cc.twittertools.search.api.TrecSearchThriftServer.java

License:Apache License

@SuppressWarnings("static-access")
public static void main(String[] args) throws Exception {
    Options options = new Options();

    options.addOption(new Option(HELP_OPTION, "show help"));
    options.addOption(OptionBuilder.withArgName("port").hasArg().withDescription("port").create(PORT_OPTION));
    options.addOption(/*  w  ww . j  a  v a2 s .co  m*/
            OptionBuilder.withArgName("index").hasArg().withDescription("index location").create(INDEX_OPTION));
    options.addOption(OptionBuilder.withArgName("num").hasArg()
            .withDescription("max number of threads in thread pool").create(MAX_THREADS_OPTION));
    options.addOption(OptionBuilder.withArgName("file").hasArg()
            .withDescription("file containing access tokens").create(CREDENTIALS_OPTION));

    CommandLine cmdline = null;
    CommandLineParser parser = new GnuParser();
    try {
        cmdline = parser.parse(options, args);
    } catch (ParseException exp) {
        System.err.println("Error parsing command line: " + exp.getMessage());
        System.exit(-1);
    }

    if (cmdline.hasOption(HELP_OPTION) || !cmdline.hasOption(INDEX_OPTION)) {
        HelpFormatter formatter = new HelpFormatter();
        formatter.printHelp(TrecSearchThriftServer.class.getName(), options);
        System.exit(-1);
    }

    int port = cmdline.hasOption(PORT_OPTION) ? Integer.parseInt(cmdline.getOptionValue(PORT_OPTION))
            : DEFAULT_PORT;
    int maxThreads = cmdline.hasOption(MAX_THREADS_OPTION)
            ? Integer.parseInt(cmdline.getOptionValue(MAX_THREADS_OPTION))
            : DEFAULT_MAX_THREADS;
    File index = new File(cmdline.getOptionValue(INDEX_OPTION));

    Map<String, String> credentials = null;
    if (cmdline.hasOption(CREDENTIALS_OPTION)) {
        credentials = Maps.newHashMap();
        File cfile = new File(cmdline.getOptionValue(CREDENTIALS_OPTION));
        if (!cfile.exists()) {
            System.err.println("Error: " + cfile + " does not exist!");
            System.exit(-1);
        }
        for (String s : Files.readLines(cfile, Charsets.UTF_8)) {
            try {
                String[] arr = s.split(":");
                credentials.put(arr[0], arr[1]);
            } catch (Exception e) {
                // Catch any exceptions from parsing file contain access tokens
                System.err.println("Error reading access tokens from " + cfile + "!");
                System.exit(-1);
            }
        }
    }

    if (!index.exists()) {
        System.err.println("Error: " + index + " does not exist!");
        System.exit(-1);
    }

    IndexReader reader = DirectoryReader.open(MMapDirectory.open(index));
    IndexSearcher searcher = new IndexSearcher(reader);
    searcher.setSimilarity(new LMDirichletSimilarity(DEFAULT_MU));

    QueryLikelihoodModel qlModel = new QueryLikelihoodModel(DEFAULT_MU);

    TServerSocket serverSocket = new TServerSocket(port);
    TrecSearch.Processor<TrecSearch.Iface> searchProcessor = new TrecSearch.Processor<TrecSearch.Iface>(
            new TrecSearchHandler(searcher, qlModel, credentials));

    TThreadPoolServer.Args serverArgs = new TThreadPoolServer.Args(serverSocket);
    serverArgs.maxWorkerThreads(maxThreads);
    TServer thriftServer = new TThreadPoolServer(
            serverArgs.processor(searchProcessor).protocolFactory(new TBinaryProtocol.Factory()));

    thriftServer.serve();
}

---

From source file:cc.twittertools.search.local.RunQueries.java

License:Apache License

@SuppressWarnings("static-access")
public static void main(String[] args) throws Exception {
    Options options = new Options();

    options.addOption(//from  w ww  .  jav  a 2 s  .c  o  m
            OptionBuilder.withArgName("path").hasArg().withDescription("index location").create(INDEX_OPTION));
    options.addOption(OptionBuilder.withArgName("num").hasArg().withDescription("number of results to return")
            .create(NUM_RESULTS_OPTION));
    options.addOption(OptionBuilder.withArgName("file").hasArg()
            .withDescription("file containing topics in TREC format").create(QUERIES_OPTION));
    options.addOption(OptionBuilder.withArgName("similarity").hasArg()
            .withDescription("similarity to use (BM25, LM)").create(SIMILARITY_OPTION));
    options.addOption(
            OptionBuilder.withArgName("string").hasArg().withDescription("runtag").create(RUNTAG_OPTION));
    options.addOption(new Option(VERBOSE_OPTION, "print out complete document"));

    CommandLine cmdline = null;
    CommandLineParser parser = new GnuParser();
    try {
        cmdline = parser.parse(options, args);
    } catch (ParseException exp) {
        System.err.println("Error parsing command line: " + exp.getMessage());
        System.exit(-1);
    }

    if (!cmdline.hasOption(QUERIES_OPTION) || !cmdline.hasOption(INDEX_OPTION)) {
        HelpFormatter formatter = new HelpFormatter();
        formatter.printHelp(RunQueries.class.getName(), options);
        System.exit(-1);
    }

    File indexLocation = new File(cmdline.getOptionValue(INDEX_OPTION));
    if (!indexLocation.exists()) {
        System.err.println("Error: " + indexLocation + " does not exist!");
        System.exit(-1);
    }

    String runtag = cmdline.hasOption(RUNTAG_OPTION) ? cmdline.getOptionValue(RUNTAG_OPTION) : DEFAULT_RUNTAG;

    String topicsFile = cmdline.getOptionValue(QUERIES_OPTION);

    int numResults = 1000;
    try {
        if (cmdline.hasOption(NUM_RESULTS_OPTION)) {
            numResults = Integer.parseInt(cmdline.getOptionValue(NUM_RESULTS_OPTION));
        }
    } catch (NumberFormatException e) {
        System.err.println("Invalid " + NUM_RESULTS_OPTION + ": " + cmdline.getOptionValue(NUM_RESULTS_OPTION));
        System.exit(-1);
    }

    String similarity = "LM";
    if (cmdline.hasOption(SIMILARITY_OPTION)) {
        similarity = cmdline.getOptionValue(SIMILARITY_OPTION);
    }

    boolean verbose = cmdline.hasOption(VERBOSE_OPTION);

    PrintStream out = new PrintStream(System.out, true, "UTF-8");

    IndexReader reader = DirectoryReader.open(FSDirectory.open(indexLocation));
    IndexSearcher searcher = new IndexSearcher(reader);

    if (similarity.equalsIgnoreCase("BM25")) {
        searcher.setSimilarity(new BM25Similarity());
    } else if (similarity.equalsIgnoreCase("LM")) {
        searcher.setSimilarity(new LMDirichletSimilarity(2500.0f));
    }

    QueryParser p = new QueryParser(Version.LUCENE_43, StatusField.TEXT.name, IndexStatuses.ANALYZER);

    TrecTopicSet topics = TrecTopicSet.fromFile(new File(topicsFile));
    for (TrecTopic topic : topics) {
        Query query = p.parse(topic.getQuery());
        Filter filter = NumericRangeFilter.newLongRange(StatusField.ID.name, 0L, topic.getQueryTweetTime(),
                true, true);

        TopDocs rs = searcher.search(query, filter, numResults);

        int i = 1;
        for (ScoreDoc scoreDoc : rs.scoreDocs) {
            Document hit = searcher.doc(scoreDoc.doc);
            out.println(String.format("%s Q0 %s %d %f %s", topic.getId(),
                    hit.getField(StatusField.ID.name).numericValue(), i, scoreDoc.score, runtag));
            if (verbose) {
                out.println("# " + hit.toString().replaceAll("[\\n\\r]+", " "));
            }
            i++;
        }
    }
    reader.close();
    out.close();
}

---

From source file:cc.twittertools.search.local.SearchStatuses.java

License:Apache License

@SuppressWarnings("static-access")
public static void main(String[] args) throws Exception {
    Options options = new Options();
    options.addOption(//w w w.  j  ava 2  s. co m
            OptionBuilder.withArgName("path").hasArg().withDescription("index location").create(INDEX_OPTION));
    options.addOption(
            OptionBuilder.withArgName("string").hasArg().withDescription("query id").create(QID_OPTION));
    options.addOption(
            OptionBuilder.withArgName("string").hasArg().withDescription("query text").create(QUERY_OPTION));
    options.addOption(
            OptionBuilder.withArgName("string").hasArg().withDescription("runtag").create(RUNTAG_OPTION));
    options.addOption(OptionBuilder.withArgName("num").hasArg().withDescription("maxid").create(MAX_ID_OPTION));
    options.addOption(OptionBuilder.withArgName("num").hasArg().withDescription("number of results to return")
            .create(NUM_RESULTS_OPTION));
    options.addOption(OptionBuilder.withArgName("similarity").hasArg()
            .withDescription("similarity to use (BM25, LM)").create(SIMILARITY_OPTION));
    options.addOption(new Option(VERBOSE_OPTION, "print out complete document"));

    CommandLine cmdline = null;
    CommandLineParser parser = new GnuParser();
    try {
        cmdline = parser.parse(options, args);
    } catch (ParseException exp) {
        System.err.println("Error parsing command line: " + exp.getMessage());
        System.exit(-1);
    }

    if (!cmdline.hasOption(QUERY_OPTION) || !cmdline.hasOption(INDEX_OPTION)) {
        HelpFormatter formatter = new HelpFormatter();
        formatter.printHelp(SearchStatuses.class.getName(), options);
        System.exit(-1);
    }

    File indexLocation = new File(cmdline.getOptionValue(INDEX_OPTION));
    if (!indexLocation.exists()) {
        System.err.println("Error: " + indexLocation + " does not exist!");
        System.exit(-1);
    }

    String qid = cmdline.hasOption(QID_OPTION) ? cmdline.getOptionValue(QID_OPTION) : DEFAULT_QID;
    String queryText = cmdline.hasOption(QUERY_OPTION) ? cmdline.getOptionValue(QUERY_OPTION) : DEFAULT_Q;
    String runtag = cmdline.hasOption(RUNTAG_OPTION) ? cmdline.getOptionValue(RUNTAG_OPTION) : DEFAULT_RUNTAG;
    long maxId = cmdline.hasOption(MAX_ID_OPTION) ? Long.parseLong(cmdline.getOptionValue(MAX_ID_OPTION))
            : DEFAULT_MAX_ID;
    int numResults = cmdline.hasOption(NUM_RESULTS_OPTION)
            ? Integer.parseInt(cmdline.getOptionValue(NUM_RESULTS_OPTION))
            : DEFAULT_NUM_RESULTS;
    boolean verbose = cmdline.hasOption(VERBOSE_OPTION);

    String similarity = "LM";
    if (cmdline.hasOption(SIMILARITY_OPTION)) {
        similarity = cmdline.getOptionValue(SIMILARITY_OPTION);
    }

    PrintStream out = new PrintStream(System.out, true, "UTF-8");

    IndexReader reader = DirectoryReader.open(FSDirectory.open(indexLocation));
    IndexSearcher searcher = new IndexSearcher(reader);

    if (similarity.equalsIgnoreCase("BM25")) {
        searcher.setSimilarity(new BM25Similarity());
    } else if (similarity.equalsIgnoreCase("LM")) {
        searcher.setSimilarity(new LMDirichletSimilarity(2500.0f));
    }

    QueryParser p = new QueryParser(Version.LUCENE_43, IndexStatuses.StatusField.TEXT.name,
            IndexStatuses.ANALYZER);
    Query query = p.parse(queryText);
    Filter filter = NumericRangeFilter.newLongRange(StatusField.ID.name, 0L, maxId, true, true);

    TopDocs rs = searcher.search(query, filter, numResults);

    int i = 1;
    for (ScoreDoc scoreDoc : rs.scoreDocs) {
        Document hit = searcher.doc(scoreDoc.doc);

        out.println(String.format("%s Q0 %s %d %f %s", qid, hit.getField(StatusField.ID.name).numericValue(), i,
                scoreDoc.score, runtag));
        if (verbose) {
            out.println("# " + hit.toString().replaceAll("[\\n\\r]+", " "));
        }
        i++;
    }

    reader.close();
    out.close();
}

---

From source file:cc.wikitools.lucene.WikipediaSearcher.java

License:Apache License

protected void init() {
    searcher = new IndexSearcher(reader);
    searcher.setSimilarity(new LMDirichletSimilarity(2500.0f));

    parserArticle = new QueryParser(Version.LUCENE_43, IndexField.TEXT.name, IndexWikipediaDump.ANALYZER);
    parserTitle = new QueryParser(Version.LUCENE_43, IndexField.TITLE.name, IndexWikipediaDump.ANALYZER);
}

---

From source file:io.anserini.search.SearchCollection.java

License:Apache License

public SearchCollection(SearchArgs args) throws IOException {
    this.args = args;
    Path indexPath = Paths.get(args.index);

    if (!Files.exists(indexPath) || !Files.isDirectory(indexPath) || !Files.isReadable(indexPath)) {
        throw new IllegalArgumentException(args.index + " does not exist or is not a directory.");
    }/*from  w  ww .  j  a v  a2 s . c o m*/

    LOG.info("Reading index at " + args.index);
    this.reader = DirectoryReader.open(FSDirectory.open(indexPath));

    // Figure out which scoring model to use.
    if (args.ql) {
        LOG.info("Using QL scoring model");
        this.similarity = new LMDirichletSimilarity(args.mu);
    } else if (args.bm25) {
        LOG.info("Using BM25 scoring model");
        this.similarity = new BM25Similarity(args.k1, args.b);
    } else if (args.f2log) {
        LOG.info("Using F2Log scoring model");
        this.similarity = new F2LogSimilarity(args.f2log_s);
    } else {
        throw new IllegalArgumentException("Error: Must specify scoring model!");
    }

    // Are we searching tweets?
    if (args.searchtweets) {
        analyzer = new TweetAnalyzer();
    } else {
        analyzer = args.keepstop ? new EnglishAnalyzer(CharArraySet.EMPTY_SET) : new EnglishAnalyzer();
    }

    isRerank = args.rm3 || args.axiom;

    // Set up the ranking cascade.
    cascade = new RerankerCascade();
    if (args.rm3) {
        cascade.add(new Rm3Reranker(analyzer, FIELD_BODY, args));
    } else if (args.axiom) {
        cascade.add(new AxiomReranker(FIELD_BODY, args));
    }

    cascade.add(new ScoreTiesAdjusterReranker());
}

---

From source file:io.anserini.search.SearchTweets.java

License:Apache License

public static void main(String[] args) throws Exception {
    long curTime = System.nanoTime();
    SearchArgs searchArgs = new SearchArgs();
    CmdLineParser parser = new CmdLineParser(searchArgs, ParserProperties.defaults().withUsageWidth(90));

    try {//from   w w w  . j a v a 2 s .c om
        parser.parseArgument(args);
    } catch (CmdLineException e) {
        System.err.println(e.getMessage());
        parser.printUsage(System.err);
        System.err.println("Example: SearchTweets" + parser.printExample(OptionHandlerFilter.REQUIRED));
        return;
    }

    LOG.info("Reading index at " + searchArgs.index);
    Directory dir;
    if (searchArgs.inmem) {
        LOG.info("Using MMapDirectory with preload");
        dir = new MMapDirectory(Paths.get(searchArgs.index));
        ((MMapDirectory) dir).setPreload(true);
    } else {
        LOG.info("Using default FSDirectory");
        dir = FSDirectory.open(Paths.get(searchArgs.index));
    }

    IndexReader reader = DirectoryReader.open(dir);
    IndexSearcher searcher = new IndexSearcher(reader);

    if (searchArgs.ql) {
        LOG.info("Using QL scoring model");
        searcher.setSimilarity(new LMDirichletSimilarity(searchArgs.mu));
    } else if (searchArgs.bm25) {
        LOG.info("Using BM25 scoring model");
        searcher.setSimilarity(new BM25Similarity(searchArgs.k1, searchArgs.b));
    } else {
        LOG.error("Error: Must specify scoring model!");
        System.exit(-1);
    }

    RerankerCascade cascade = new RerankerCascade();
    if (searchArgs.rm3) {
        cascade.add(new Rm3Reranker(IndexTweets.ANALYZER, StatusField.TEXT.name,
                "src/main/resources/io/anserini/rerank/rm3/rm3-stoplist.twitter.txt"));
        cascade.add(new RemoveRetweetsTemporalTiebreakReranker());
    } else {
        cascade.add(new RemoveRetweetsTemporalTiebreakReranker());
    }

    MicroblogTopicSet topics = MicroblogTopicSet.fromFile(new File(searchArgs.topics));

    PrintStream out = new PrintStream(new FileOutputStream(new File(searchArgs.output)));
    LOG.info("Writing output to " + searchArgs.output);

    LOG.info("Initialized complete! (elapsed time = " + (System.nanoTime() - curTime) / 1000000 + "ms)");
    long totalTime = 0;
    int cnt = 0;
    for (MicroblogTopic topic : topics) {
        long curQueryTime = System.nanoTime();

        Filter filter = NumericRangeFilter.newLongRange(StatusField.ID.name, 0L, topic.getQueryTweetTime(),
                true, true);
        Query query = AnalyzerUtils.buildBagOfWordsQuery(StatusField.TEXT.name, IndexTweets.ANALYZER,
                topic.getQuery());

        TopDocs rs = searcher.search(query, filter, searchArgs.hits);

        RerankerContext context = new RerankerContext(searcher, query, topic.getId(), topic.getQuery(),
                Sets.newHashSet(AnalyzerUtils.tokenize(IndexTweets.ANALYZER, topic.getQuery())), filter);
        ScoredDocuments docs = cascade.run(ScoredDocuments.fromTopDocs(rs, searcher), context);

        for (int i = 0; i < docs.documents.length; i++) {
            String qid = topic.getId().replaceFirst("^MB0*", "");
            out.println(String.format("%s Q0 %s %d %f %s", qid,
                    docs.documents[i].getField(StatusField.ID.name).numericValue(), (i + 1), docs.scores[i],
                    searchArgs.runtag));
        }
        long qtime = (System.nanoTime() - curQueryTime) / 1000000;
        LOG.info("Query " + topic.getId() + " (elapsed time = " + qtime + "ms)");
        totalTime += qtime;
        cnt++;
    }

    LOG.info("All queries completed!");
    LOG.info("Total elapsed time = " + totalTime + "ms");
    LOG.info("Average query latency = " + (totalTime / cnt) + "ms");

    reader.close();
    out.close();
}

---

From source file:io.anserini.search.SearchWebCollection.java

License:Apache License

public static void main(String[] args) throws IOException, ParseException {

    long curTime = System.nanoTime();
    SearchArgs searchArgs = new SearchArgs();
    CmdLineParser parser = new CmdLineParser(searchArgs, ParserProperties.defaults().withUsageWidth(90));

    try {//ww  w .java  2 s. com
        parser.parseArgument(args);
    } catch (CmdLineException e) {
        System.err.println(e.getMessage());
        parser.printUsage(System.err);
        System.err.println("Example: SearchWebCollection" + parser.printExample(OptionHandlerFilter.REQUIRED));
        return;
    }

    LOG.info("Reading index at " + searchArgs.index);
    Directory dir;
    if (searchArgs.inmem) {
        LOG.info("Using MMapDirectory with preload");
        dir = new MMapDirectory(Paths.get(searchArgs.index));
        ((MMapDirectory) dir).setPreload(true);
    } else {
        LOG.info("Using default FSDirectory");
        dir = FSDirectory.open(Paths.get(searchArgs.index));
    }

    Similarity similarity = null;

    if (searchArgs.ql) {
        LOG.info("Using QL scoring model");
        similarity = new LMDirichletSimilarity(searchArgs.mu);
    } else if (searchArgs.bm25) {
        LOG.info("Using BM25 scoring model");
        similarity = new BM25Similarity(searchArgs.k1, searchArgs.b);
    } else {
        LOG.error("Error: Must specify scoring model!");
        System.exit(-1);
    }

    RerankerCascade cascade = new RerankerCascade();
    if (searchArgs.rm3) {
        cascade.add(new Rm3Reranker(new EnglishAnalyzer(), "body",
                "src/main/resources/io/anserini/rerank/rm3/rm3-stoplist.gov2.txt"));
    } else {
        cascade.add(new IdentityReranker());
    }

    Path topicsFile = Paths.get(searchArgs.topics);

    if (!Files.exists(topicsFile) || !Files.isRegularFile(topicsFile) || !Files.isReadable(topicsFile)) {
        throw new IllegalArgumentException(
                "Topics file : " + topicsFile + " does not exist or is not a (readable) file.");
    }

    SortedMap<Integer, String> topics = io.anserini.document.Collection.GOV2.equals(searchArgs.collection)
            ? readTeraByteTackQueries(topicsFile)
            : readWebTrackQueries(topicsFile);

    SearchWebCollection searcher = new SearchWebCollection(searchArgs.index);
    searcher.search(topics, searchArgs.output, similarity, searchArgs.hits);
    searcher.close();
}

---

From source file:io.anserini.search.SimpleSearcher.java

License:Apache License

public SimpleSearcher(String indexDir) throws IOException {
    Path indexPath = Paths.get(indexDir);

    if (!Files.exists(indexPath) || !Files.isDirectory(indexPath) || !Files.isReadable(indexPath)) {
        throw new IllegalArgumentException(indexDir + " does not exist or is not a directory.");
    }//from   w w w .  j  a  v a2  s.  c  o m

    this.reader = DirectoryReader.open(FSDirectory.open(indexPath));
    this.similarity = new LMDirichletSimilarity(1000.0f);
    this.analyzer = new EnglishAnalyzer();
}

---

From source file:ir.ac.ut.engine.FeaturedRetriever.java

public static ScoreDoc[] search(String query, String qId, String field) throws IOException {
    float mu = (float) 1000;
    query = query.toLowerCase();//from   ww  w .j av a2  s.  com
    BooleanQuery.setMaxClauseCount(query.length());

    Analyzer analyzer;
    if (field.equals(IndexedDocument.FIELD_REAL_ID)) {
        analyzer = new SimpleAnalyzer(Version.LUCENE_CURRENT);
    } else if (field.equals(IndexedDocument.FIELD_NAMED_ENTITIES)) {
        analyzer = (new MyAnalyzer(false)).MyNgramAnalyzer();
    } else if (field.equals(IndexedDocument.FIELD_SORTED_BIGRAMS)) {
        analyzer = (new MyAnalyzer(false)).MyNgramAnalyzer();
    } else if (field.equals(IndexedDocument.FIELD_SORTED_TRIGRAMS)) {
        analyzer = (new MyAnalyzer(false)).MyNgramAnalyzer();
    } else if (field.equals(IndexedDocument.FIELD_STOPWORDS3Gram)) {
        analyzer = (new MyAnalyzer(false)).MyNgramAnalyzer();
    } else if (field.equals(IndexedDocument.FIELD_POS3GRAM)) {
        analyzer = (new MyAnalyzer(false)).MyNgramAnalyzer();
    } else {
        analyzer = (new MyAnalyzer(false)).MyDefaultAnalyzer();
    }

    QueryParser qParser = new QueryParser(Version.LUCENE_47, field, analyzer);
    Query q = null;
    try {
        q = qParser.parse(QueryParser.escape(query));
    } catch (org.apache.lucene.queryparser.classic.ParseException e) {
        e.printStackTrace();
        System.out.println("Exceptional Query:" + qId);
        return new ScoreDoc[0];
    }

    Similarity simFunction = new LMDirichletSimilarity(mu);
    // Similarity simFunction = new BM25Similarity();
    IndexSearcher isearcher = new IndexSearcher(ireader);
    isearcher.setSimilarity(simFunction);
    TopFieldCollector tfc = TopFieldCollector.create(Sort.RELEVANCE, ireader.numDocs(), true, true, true,
            false);
    isearcher.search(q, tfc);

    TopDocs results = tfc.topDocs();
    ScoreDoc[] hits = results.scoreDocs;
    reportInTREC(hits, qId);
    return hits;
}

---

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