private Tree<String> merge(Tree<String> leftTree, Tree<String> rightTree) {
int span = leftTree.getYield().size() + rightTree.getYield().size();
String mostFrequentLabel = spanToCategories.getCounter(span).argMax();
List<Tree<String>> children = new ArrayList<Tree<String>>();
children.add(leftTree);
children.add(rightTree);
return new Tree<String>(mostFrequentLabel, children);
}
public void train(List<Tree<String>> trainTrees) {
lexicon = new Lexicon(trainTrees);
knownParses = new CounterMap<List<String>, Tree<String>>();
spanToCategories = new CounterMap<Integer, String>();
for (Tree<String> trainTree : trainTrees) {
List<String> tags = trainTree.getPreTerminalYield();
knownParses.incrementCount(tags, trainTree, 1.0);
tallySpans(trainTree, 0);
}
}
private void tallyTree(
Tree<String> tree,
Counter<String> symbolCounter,
Counter<UnaryRule> unaryRuleCounter,
Counter<BinaryRule> binaryRuleCounter) {
if (tree.isLeaf()) return;
if (tree.isPreTerminal()) return;
if (tree.getChildren().size() == 1) {
UnaryRule unaryRule = makeUnaryRule(tree);
symbolCounter.incrementCount(tree.getLabel(), 1.0);
unaryRuleCounter.incrementCount(unaryRule, 1.0);
}
if (tree.getChildren().size() == 2) {
BinaryRule binaryRule = makeBinaryRule(tree);
symbolCounter.incrementCount(tree.getLabel(), 1.0);
binaryRuleCounter.incrementCount(binaryRule, 1.0);
}
if (tree.getChildren().size() < 1 || tree.getChildren().size() > 2) {
throw new RuntimeException(
"Attempted to construct a Grammar with an illegal tree: " + tree);
}
for (Tree<String> child : tree.getChildren()) {
tallyTree(child, symbolCounter, unaryRuleCounter, binaryRuleCounter);
}
}
/* Builds a lexicon from the observed tags in a list of training trees. */
public Lexicon(List<Tree<String>> trainTrees) {
for (Tree<String> trainTree : trainTrees) {
List<String> words = trainTree.getYield();
List<String> tags = trainTree.getPreTerminalYield();
for (int position = 0; position < words.size(); position++) {
String word = words.get(position);
String tag = tags.get(position);
tallyTagging(word, tag);
}
}
}
private int tallySpans(Tree<String> tree, int start) {
if (tree.isLeaf() || tree.isPreTerminal()) return 1;
int end = start;
for (Tree<String> child : tree.getChildren()) {
int childSpan = tallySpans(child, end);
end += childSpan;
}
String category = tree.getLabel();
if (!category.equals("ROOT")) spanToCategories.incrementCount(end - start, category, 1.0);
return end - start;
}
private static void testParser(Parser parser, List<Tree<String>> testTrees) {
EnglishPennTreebankParseEvaluator.LabeledConstituentEval<String> eval =
new EnglishPennTreebankParseEvaluator.LabeledConstituentEval<String>(
Collections.singleton("ROOT"),
new HashSet<String>(Arrays.asList(new String[] {"''", "``", ".", ":", ","})));
for (Tree<String> testTree : testTrees) {
List<String> testSentence = testTree.getYield();
if (testSentence.size() > MAX_LENGTH) continue;
Tree<String> guessedTree = parser.getBestParse(testSentence);
System.out.println("Guess:\n" + Trees.PennTreeRenderer.render(guessedTree));
System.out.println("Gold:\n" + Trees.PennTreeRenderer.render(testTree));
eval.evaluate(guessedTree, testTree);
}
eval.display(true);
}
private static Tree<String> binarizeTreeHelper(
Tree<String> tree, int numChildrenGenerated, String intermediateLabel) {
Tree<String> leftTree = tree.getChildren().get(numChildrenGenerated);
List<Tree<String>> children = new ArrayList<Tree<String>>();
children.add(binarizeTree(leftTree));
// Wait! Don't binarize too much. The last child doesn't need to have a new node.
// It can be paired with the 2nd to last child!
if (numChildrenGenerated == tree.getChildren().size() - 2) {
children.add(binarizeTree(tree.getChildren().get(numChildrenGenerated + 1)));
} else if (numChildrenGenerated < tree.getChildren().size() - 1) {
Tree<String> rightTree =
binarizeTreeHelper(
tree, numChildrenGenerated + 1, intermediateLabel + "_" + leftTree.getLabel());
children.add(rightTree);
}
return new Tree<String>(intermediateLabel, children);
}
private static Tree<String> markovizeTree(Tree<String> tree, String parentLabel) {
String label = tree.getLabel();
// Tried using ^ but unannotate didn't remove it. Instead using - since that is properly
// removed
if (parentLabel != null) {
label = label + "-" + parentLabel;
}
// If you're a preterminal, don't bother markovizing
if (tree.isPreTerminal()) return tree;
List<Tree<String>> children = new ArrayList<Tree<String>>();
for (Tree<String> child : tree.getChildren()) {
children.add(markovizeTree(child, tree.getLabel()));
}
Tree<String> newTree = new Tree<String>(label, children);
return newTree;
}
private static Tree<String> binarizeTree(Tree<String> tree) {
String label = tree.getLabel();
if (tree.isLeaf()) return new Tree<String>(label);
if (tree.getChildren().size() == 1) {
return new Tree<String>(
label, Collections.singletonList(binarizeTree(tree.getChildren().get(0))));
}
// I think it tries to binarize a binary tree. This is silly. Just binarize the subtrees.
if (tree.getChildren().size() == 2) {
List<Tree<String>> children = new ArrayList<Tree<String>>();
children.add(binarizeTree(tree.getChildren().get(0)));
children.add(binarizeTree(tree.getChildren().get(1)));
return new Tree<String>(label, children);
}
// otherwise, it's a TERNARY-or-more local tree,
// so decompose it into a sequence of binary and unary trees.
String intermediateLabel = "@" + label + "->";
Tree<String> intermediateTree = binarizeTreeHelper(tree, 0, intermediateLabel);
return new Tree<String>(label, intermediateTree.getChildren());
}
private BinaryRule makeBinaryRule(Tree<String> tree) {
return new BinaryRule(
tree.getLabel(),
tree.getChildren().get(0).getLabel(),
tree.getChildren().get(1).getLabel());
}
private Tree<String> getBestKnownParse(List<String> tags, List<String> sentence) {
Tree<String> parse = knownParses.getCounter(tags).argMax().deepCopy();
parse.setWords(sentence);
return parse;
}
public Tree<String> getParseTreeOld(
List<String> sentence,
HashMap<String, Triplet<Integer, String, String>> backHash,
int begin,
int end,
String parent) {
// Start from the root and keep going down till you reach the leafs.
// System.out.println("In recursion!!");
if (begin == end - 1) {
if ((begin + " " + end).equals("0 1")) {
// System.out.println("CounterMap");
// System.out.println(parseScores.getCounter(begin+" "+end).toString());
// backHash.get(begin+ " " + end+ " "+parent);
}
// String parent = parseScores.getCounter(begin+" "+end).argMax();
// System.out.println("Terminal cond :"+begin+ " "+ end+ " "+parent);
Triplet<Integer, String, String> triplet = backHash.get(begin + " " + end + " " + parent);
int split = -1;
if (triplet != null) {
split = triplet.getFirst();
}
if ((begin + " " + end).equals("0 1")) {
// System.out.println("CounterMap");
// System.out.println(parseScores.getCounter(begin+" "+end).toString());
// System.out.println(backHash.get(begin+ " " + end+ " "+parent).toString());
}
Tree<String> topTree = new Tree<String>(parent);
Tree<String> tree = topTree;
while (triplet != null && split == -1) {
Tree<String> singleTree = new Tree<String>(triplet.getSecond());
tree.setChildren(Collections.singletonList(singleTree));
triplet = backHash.get(begin + " " + end + " " + triplet.getSecond());
if (triplet != null) {
split = triplet.getFirst();
}
tree = tree.getChildren().get(0);
}
// return new Tree<String>(tree.getLabel(), ));
tree.setChildren(Collections.singletonList(new Tree<String>(sentence.get(begin))));
return topTree;
}
/*if((begin +" " + end).equals("1 5")){
System.out.println("CounterMap");
System.out.println(parseScores.getCounter(begin+" "+end).toString());
//backHash.get(begin+ " " + end+ " "+parent);
}*/
// String parent = parseScores.getCounter(begin+" "+end).argMax();
// System.out.println(parent);
Triplet<Integer, String, String> triplet = backHash.get(begin + " " + end + " " + parent);
// System.out.println(triplet.getSecond() + " " + triplet.getFirst());
if ((begin + " " + end).equals("0 6")) {
// System.out.println("CounterMap");
// System.out.println(parent);
// System.out.println(backHash.get(begin+ " " + end+ " "+parent).toString());
}
if (triplet == null) {
System.out.println(begin + " " + end + " " + parent);
}
int split = triplet.getFirst();
Tree<String> topTree = new Tree<String>(parent);
Tree<String> tree = topTree;
// System.out.println("parent : " +parent);
while (split == -1) {
// System.out.println(tree.toString());
Tree<String> singleTree = new Tree<String>(triplet.getSecond());
// System.out.println(triplet.getSecond());
tree.setChildren(Collections.singletonList(singleTree));
// System.out.println(tree.toString());
// System.out.println("XXXXXXXXXXXXXXXXXXXXXXXXXXXxx");
// System.out.println(triplet.getSecond());
triplet = backHash.get(begin + " " + end + " " + triplet.getSecond());
if (triplet != null) {
split = triplet.getFirst();
}
tree = tree.getChildren().get(0);
}
// System.out.println(tree.toString());
Tree<String> leftTree =
getParseTreeOld(sentence, backHash, begin, split, triplet.getSecond());
Tree<String> rightTree = getParseTreeOld(sentence, backHash, split, end, triplet.getThird());
// System.out.println("leftTree: "+ leftTree.toString());
// System.out.println("rightTree :" +rightTree.toString());
// System.out.println("topTree :"+topTree.toString());
List<Tree<String>> children = new ArrayList<Tree<String>>();
children.add(leftTree);
children.add(rightTree);
tree.setChildren(children);
return topTree;
}
public Tree<String> getParseTree(
List<String> sentence,
HashMap<Triplet<Integer, Integer, String>, Triplet<Integer, String, String>> backHash,
int begin,
int end,
String parent) {
// Start from the root and keep going down till you reach the leafs.
if (begin == end - 1) {
Triplet<Integer, String, String> triplet =
backHash.get(new Triplet<Integer, Integer, String>(begin, end, parent));
int split = -1;
if (triplet != null) {
split = triplet.getFirst();
}
Tree<String> topTree = new Tree<String>(parent);
Tree<String> tree = topTree;
while (triplet != null && split == -1) {
Tree<String> singleTree = new Tree<String>(triplet.getSecond());
tree.setChildren(Collections.singletonList(singleTree));
triplet =
backHash.get(new Triplet<Integer, Integer, String>(begin, end, triplet.getSecond()));
if (triplet != null) {
split = triplet.getFirst();
}
tree = tree.getChildren().get(0);
}
tree.setChildren(Collections.singletonList(new Tree<String>(sentence.get(begin))));
return topTree;
}
Triplet<Integer, String, String> triplet =
backHash.get(new Triplet<Integer, Integer, String>(begin, end, parent));
if (triplet == null) {
System.out.println(begin + " " + end + " " + parent);
}
int split = triplet.getFirst();
Tree<String> topTree = new Tree<String>(parent);
Tree<String> tree = topTree;
while (split == -1) {
Tree<String> singleTree = new Tree<String>(triplet.getSecond());
tree.setChildren(Collections.singletonList(singleTree));
triplet =
backHash.get(new Triplet<Integer, Integer, String>(begin, end, triplet.getSecond()));
if (triplet != null) {
split = triplet.getFirst();
}
tree = tree.getChildren().get(0);
}
Tree<String> leftTree = getParseTree(sentence, backHash, begin, split, triplet.getSecond());
Tree<String> rightTree = getParseTree(sentence, backHash, split, end, triplet.getThird());
List<Tree<String>> children = new ArrayList<Tree<String>>();
children.add(leftTree);
children.add(rightTree);
tree.setChildren(children);
return topTree;
}
