Java tutorial
/* * Copyright 2013 * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package de.tudarmstadt.lt.lm.app; import java.io.File; import java.io.FileFilter; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintStream; import java.io.Reader; import java.rmi.registry.Registry; import java.util.Arrays; import java.util.List; import org.apache.commons.cli.CommandLine; import org.apache.commons.cli.Option; import org.apache.commons.cli.OptionBuilder; import org.apache.commons.cli.Options; import org.apache.commons.io.LineIterator; import org.apache.commons.lang.StringUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import de.tudarmstadt.lt.lm.service.AbstractStringProvider; import de.tudarmstadt.lt.lm.service.StringProviderMXBean; import de.tudarmstadt.lt.utilities.cli.CliUtils; import de.tudarmstadt.lt.utilities.cli.ExtendedGnuParser; /** * * Get probabilities for provided ngrams * * @author Steffen Remus */ public class NgramProbs implements Runnable { private final static String USAGE_HEADER = "Options"; private final static Logger LOG = LoggerFactory.getLogger(NgramProbs.class); public static void main(String[] args) throws Exception { new NgramProbs(args).run(); } /** * */ @SuppressWarnings("static-access") public NgramProbs(String args[]) { Options opts = new Options(); opts.addOption(new Option("?", "help", false, "display this message")); opts.addOption(OptionBuilder.withLongOpt("port").withArgName("port-number").hasArg() .withDescription( String.format("Specifies the port on which the rmi registry listens (default: %d).", Registry.REGISTRY_PORT)) .create("p")); opts.addOption(OptionBuilder.withLongOpt("host").withArgName("hostname").hasArg() .withDescription("Specifies the hostname on which the rmi registry listens (default: localhost).") .create("h")); opts.addOption(OptionBuilder.withLongOpt("file").withArgName("name").hasArg().withDescription( "Specify the file or directory that contains '.txt' with one ngram per line. Specify '-' to pipe from stdin. (default: '-').") .create("f")); opts.addOption(OptionBuilder.withLongOpt("out").withArgName("name").hasArg() .withDescription("Specify the output file. Specify '-' to use stdout. (default: '-').") .create("o")); opts.addOption(OptionBuilder.withLongOpt("name").withArgName("identifier").isRequired().hasArg() .withDescription("Specify the name of the language model provider that you want to connect to.") .create("i")); try { CommandLine cmd = new ExtendedGnuParser(true).parse(opts, args); if (cmd.hasOption("help")) CliUtils.print_usage_quit(System.err, StartLM.class.getSimpleName(), opts, USAGE_HEADER, null, 0); _host = cmd.getOptionValue("host", "localhost"); _rmiport = Integer.parseInt(cmd.getOptionValue("port", String.valueOf(Registry.REGISTRY_PORT))); _file = cmd.getOptionValue("file", "-"); _out = cmd.getOptionValue("out", "-"); _name = cmd.getOptionValue("name"); _host = cmd.getOptionValue("host", "localhost"); } catch (Exception e) { LOG.error("{}: {}- {}", _rmi_string, e.getClass().getSimpleName(), e.getMessage()); CliUtils.print_usage_quit(System.err, StartLM.class.getSimpleName(), opts, USAGE_HEADER, String.format("%s: %s%n", e.getClass().getSimpleName(), e.getMessage()), 1); } _rmi_string = String.format("rmi://%s:%d/%s", _host, _rmiport, _name); } String _rmi_string; int _rmiport; String _file; String _out; String _host; String _name; PrintStream _pout; double _min_prob = Double.MAX_VALUE; double _max_prob = -Double.MAX_VALUE; List<String> _min_ngram = null; List<String> _max_ngram = null; StringProviderMXBean _lm_prvdr = null; long _oov_terms = 0; long _oov_ngrams = 0; long _num_ngrams = 0; /* (non-Javadoc) * @see java.lang.Runnable#run() */ @Override public void run() { _lm_prvdr = AbstractStringProvider.connectToServer(_host, _rmiport, _name); if (_lm_prvdr == null) { LOG.error("Could not connect to language model at '{}'", _rmi_string); return; } _pout = System.out; if (!"-".equals(_out)) { try { _pout = new PrintStream(new FileOutputStream(new File(_out), true)); } catch (FileNotFoundException e) { LOG.error("Could not open ouput file '{}' for writing.", _out, e); System.exit(1); } } if ("-".equals(_file.trim())) { LOG.info("{}: Processing text from stdin ('{}').", _rmi_string, _file); try { run(new InputStreamReader(System.in, "UTF-8")); } catch (Exception e) { LOG.error("{}: Could not compute perplexity from file '{}'.", _rmi_string, _file, e); } } else { File f_or_d = new File(_file); if (!f_or_d.exists()) throw new Error(String.format("%s: File or directory '%s' not found.", _rmi_string, _file)); if (f_or_d.isFile()) { LOG.info("{}: Processing file '{}'.", _rmi_string, f_or_d.getAbsolutePath()); try { run(new InputStreamReader(new FileInputStream(f_or_d), "UTF-8")); } catch (Exception e) { LOG.error("{}: Could not compute perplexity from file '{}'.", _rmi_string, f_or_d.getAbsolutePath(), e); } } if (f_or_d.isDirectory()) { File[] txt_files = f_or_d.listFiles(new FileFilter() { @Override public boolean accept(File f) { return f.isFile() && f.getName().endsWith(".txt"); } }); for (int i = 0; i < txt_files.length; i++) { File f = txt_files[i]; LOG.info("{}: Processing file '{}' ({}/{}).", _rmi_string, f.getAbsolutePath(), i + 1, txt_files.length); try { run(new InputStreamReader(new FileInputStream(f), "UTF-8")); } catch (Exception e) { LOG.error("{}: Could not compute perplexity from file '{}'.", _rmi_string, f.getAbsolutePath(), e); } } } } String o = String.format("%s\t%s\tMax=%s (%6.3e)\tMin=%s (%6.3e)", _rmi_string, _file, _max_ngram, Math.pow(10, _max_prob), _min_ngram, Math.pow(10, _min_prob)); LOG.info(o); } void run(Reader r) { long l = 0; for (LineIterator liter = new LineIterator(r); liter.hasNext();) { if (++l % 5000 == 0) LOG.info("{}: processing line {}:{}.", _rmi_string, _file, l); String line = liter.next(); if (line.trim().isEmpty()) continue; List<String> ngram = Arrays.asList(line.split(" ")); if (ngram.isEmpty()) continue; _num_ngrams++; try { if (_lm_prvdr.ngramContainsOOV(ngram)) { _oov_ngrams++; if (_lm_prvdr.ngramEndsWithOOV(ngram)) { _oov_terms++; } } double log10prob = _lm_prvdr.getNgramLog10Probability(ngram); write(String.format("%s\t%6.3e\t%s\t%s\t%s%n", StringUtils.join(ngram, ' '), Math.pow(10, log10prob), _rmi_string, _file, StringUtils.join(_lm_prvdr.getNgramAsWords(_lm_prvdr.getNgramAsIds(ngram)), ' '))); if (log10prob > _max_prob) { _max_prob = log10prob; _max_ngram = ngram; } if (log10prob < _min_prob) { _min_prob = log10prob; _min_ngram = ngram; } } catch (Exception e) { LOG.error("{}: Could not add ngram '{}' to perplexity.", _rmi_string, ngram); continue; } } } void write(String towrite) { if ("-".equals(_out)) _pout.print(towrite); else { File lock = new File(_out + ".lock"); while (lock.exists()) try { Thread.sleep(1000); } catch (InterruptedException e) { } try { lock.createNewFile(); } catch (IOException e) { LOG.warn("Could not create lock '{}'.", lock, e); } _pout.print(towrite); lock.delete(); } } }