public static List<String> toTagList(List<State> states) {
List<String> tags = new ArrayList<String>();
if (states.size() > 0) {
tags.add(states.get(0).getPreviousPreviousTag());
for (State state : states) {
tags.add(state.getPreviousTag());
}
}
return tags;
}
public List<S> getBestPath(Trellis<S> trellis) {
List<S> states = new ArrayList<S>();
S currentState = trellis.getStartState();
states.add(currentState);
while (!currentState.equals(trellis.getEndState())) {
Counter<S> transitions = trellis.getForwardTransitions(currentState);
S nextState = transitions.argMax();
states.add(nextState);
currentState = nextState;
}
return states;
}
private static List<TaggedSentence> readTaggedSentences(String path, boolean hasTags)
throws Exception {
List<TaggedSentence> taggedSentences = new ArrayList<TaggedSentence>();
BufferedReader reader = new BufferedReader(new FileReader(path));
String line = "";
List<String> words = new LinkedList<String>();
List<String> tags = new LinkedList<String>();
while ((line = reader.readLine()) != null) {
if (line.equals("")) {
taggedSentences.add(
new TaggedSentence(
new BoundedList<String>(words, START_WORD, STOP_WORD),
new BoundedList<String>(tags, START_WORD, STOP_WORD)));
words = new LinkedList<String>();
tags = new LinkedList<String>();
} else {
String[] fields = line.split("\\s+");
words.add(fields[0]);
tags.add(hasTags ? fields[1] : "");
}
}
System.out.println("Read " + taggedSentences.size() + " sentences.");
return taggedSentences;
}
private static List<String> getBaseFileNames(String path) {
List<File> englishFiles = IOUtils.getFilesUnder(path, new FileFilter() {
public boolean accept(File pathname) {
if (pathname.isDirectory())
return true;
String name = pathname.getName();
return name.endsWith(ENGLISH_EXTENSION);
}
});
List<String> baseFileNames = new ArrayList<String>();
for (File englishFile : englishFiles) {
String baseFileName = chop(englishFile.getAbsolutePath(), "."+ENGLISH_EXTENSION);
baseFileNames.add(baseFileName);
}
return baseFileNames;
}
private static Pair<Integer, List<String>> readSentence(String line) {
int id = -1;
List<String> words = new ArrayList<String>();
String[] tokens = line.split("\\s+");
for (int i = 0; i < tokens.length; i++) {
String token = tokens[i];
if (token.equals("<s")) continue;
if (token.equals("</s>")) continue;
if (token.startsWith("snum=")) {
String idString = token.substring(5,token.length()-1);
id = Integer.parseInt(idString);
continue;
}
words.add(token.intern());
}
return new Pair<Integer, List<String>>(id, words);
}
private List<LabeledLocalTrigramContext> extractLabeledLocalTrigramContexts(
TaggedSentence taggedSentence) {
List<LabeledLocalTrigramContext> labeledLocalTrigramContexts =
new ArrayList<LabeledLocalTrigramContext>();
List<String> words =
new BoundedList<String>(taggedSentence.getWords(), START_WORD, STOP_WORD);
List<String> tags = new BoundedList<String>(taggedSentence.getTags(), START_TAG, STOP_TAG);
for (int position = 0; position <= taggedSentence.size() + 1; position++) {
labeledLocalTrigramContexts.add(
new LabeledLocalTrigramContext(
words,
position,
tags.get(position - 2),
tags.get(position - 1),
tags.get(position)));
}
return labeledLocalTrigramContexts;
}
private static List<SentencePair> readSentencePairs(String baseFileName) {
List<SentencePair> sentencePairs = new ArrayList<SentencePair>();
String englishFileName = baseFileName + "." + ENGLISH_EXTENSION;
String frenchFileName = baseFileName + "." + FRENCH_EXTENSION;
try {
BufferedReader englishIn = new BufferedReader(new FileReader(englishFileName));
//BufferedReader frenchIn = new BufferedReader(new FileReader(frenchFileName));
BufferedReader frenchIn = new BufferedReader(new InputStreamReader(
new FileInputStream(frenchFileName), StandardCharsets.ISO_8859_1));
while (englishIn.ready() && frenchIn.ready()) {
String englishLine = englishIn.readLine();
String frenchLine = frenchIn.readLine();
Pair<Integer,List<String>> englishSentenceAndID = readSentence(englishLine);
Pair<Integer,List<String>> frenchSentenceAndID = readSentence(frenchLine);
if (! englishSentenceAndID.getFirst().equals(frenchSentenceAndID.getFirst()))
throw new RuntimeException("Sentence ID confusion in file "+baseFileName+", lines were:\n\t"+englishLine+"\n\t"+frenchLine);
sentencePairs.add(new SentencePair(englishSentenceAndID.getFirst(), baseFileName, englishSentenceAndID.getSecond(), frenchSentenceAndID.getSecond()));
}
} catch (IOException e) {
throw new RuntimeException(e);
}
return sentencePairs;
}
