/**
* A helper to add a single word to a given dependency tree
*
* @param toModify The tree to add the word to.
* @param root The root of the tree where we should be adding the word.
* @param rel The relation to add the word with.
* @param coreLabel The word to add.
*/
@SuppressWarnings("UnusedDeclaration")
private static void addWord(
SemanticGraph toModify, IndexedWord root, String rel, CoreLabel coreLabel) {
IndexedWord dependent = new IndexedWord(coreLabel);
toModify.addVertex(dependent);
toModify.addEdge(
root,
dependent,
GrammaticalRelation.valueOf(Language.English, rel),
Double.NEGATIVE_INFINITY,
false);
}
/**
* Parse a CoNLL formatted tree into a SemanticGraph object (along with a list of tokens).
*
* @param conll The CoNLL formatted tree.
* @return A pair of a SemanticGraph and a token list, corresponding to the parse of the sentence
* and to tokens in the sentence.
*/
protected Pair<SemanticGraph, List<CoreLabel>> mkTree(String conll) {
List<CoreLabel> sentence = new ArrayList<>();
SemanticGraph tree = new SemanticGraph();
for (String line : conll.split("\n")) {
if (line.trim().equals("")) {
continue;
}
String[] fields = line.trim().split("\\s+");
int index = Integer.parseInt(fields[0]);
String word = fields[1];
CoreLabel label = IETestUtils.mkWord(word, index);
sentence.add(label);
if (fields[2].equals("0")) {
tree.addRoot(new IndexedWord(label));
} else {
tree.addVertex(new IndexedWord(label));
}
if (fields.length > 4) {
label.setTag(fields[4]);
}
if (fields.length > 5) {
label.setNER(fields[5]);
}
if (fields.length > 6) {
label.setLemma(fields[6]);
}
}
int i = 0;
for (String line : conll.split("\n")) {
if (line.trim().equals("")) {
continue;
}
String[] fields = line.trim().split("\\s+");
int parent = Integer.parseInt(fields[2]);
String reln = fields[3];
if (parent > 0) {
tree.addEdge(
new IndexedWord(sentence.get(parent - 1)),
new IndexedWord(sentence.get(i)),
new GrammaticalRelation(Language.UniversalEnglish, reln, null, null),
1.0,
false);
}
i += 1;
}
return Pair.makePair(tree, sentence);
}
/**
* A helper to add an entire subtree to a given dependency tree.
*
* @param toModify The tree to add the subtree to.
* @param root The root of the tree where we should be adding the subtree.
* @param rel The relation to add the subtree with.
* @param originalTree The orignal tree (i.e., {@link ClauseSplitterSearchProblem#tree}).
* @param subject The root of the clause to add.
* @param ignoredEdges The edges to ignore adding when adding this subtree.
*/
private static void addSubtree(
SemanticGraph toModify,
IndexedWord root,
String rel,
SemanticGraph originalTree,
IndexedWord subject,
Collection<SemanticGraphEdge> ignoredEdges) {
if (toModify.containsVertex(subject)) {
return; // This subtree already exists.
}
Queue<IndexedWord> fringe = new LinkedList<>();
Collection<IndexedWord> wordsToAdd = new ArrayList<>();
Collection<SemanticGraphEdge> edgesToAdd = new ArrayList<>();
// Search for subtree to add
for (SemanticGraphEdge edge : originalTree.outgoingEdgeIterable(subject)) {
if (!ignoredEdges.contains(edge)) {
if (toModify.containsVertex(edge.getDependent())) {
// Case: we're adding a subtree that's not disjoint from toModify. This is bad news.
return;
}
edgesToAdd.add(edge);
fringe.add(edge.getDependent());
}
}
while (!fringe.isEmpty()) {
IndexedWord node = fringe.poll();
wordsToAdd.add(node);
for (SemanticGraphEdge edge : originalTree.outgoingEdgeIterable(node)) {
if (!ignoredEdges.contains(edge)) {
if (toModify.containsVertex(edge.getDependent())) {
// Case: we're adding a subtree that's not disjoint from toModify. This is bad news.
return;
}
edgesToAdd.add(edge);
fringe.add(edge.getDependent());
}
}
}
// Add subtree
// (add subject)
toModify.addVertex(subject);
toModify.addEdge(
root,
subject,
GrammaticalRelation.valueOf(Language.English, rel),
Double.NEGATIVE_INFINITY,
false);
// (add nodes)
wordsToAdd.forEach(toModify::addVertex);
// (add edges)
for (SemanticGraphEdge edge : edgesToAdd) {
assert !toModify.incomingEdgeIterator(edge.getDependent()).hasNext();
toModify.addEdge(
edge.getGovernor(),
edge.getDependent(),
edge.getRelation(),
edge.getWeight(),
edge.isExtra());
}
}