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Stanford Parser processes raw text in English, Chinese, German, Arabic, and French, and extracts constituency parse trees.
package edu.stanford.nlp.parser.lexparser;
import java.util.*;
import edu.stanford.nlp.ling.CategoryWordTag;
import edu.stanford.nlp.ling.CoreLabel;
import edu.stanford.nlp.ling.HasContext;
import edu.stanford.nlp.ling.HasWord;
import edu.stanford.nlp.ling.Label;
import edu.stanford.nlp.math.SloppyMath;
import edu.stanford.nlp.parser.KBestViterbiParser;
import edu.stanford.nlp.trees.Tree;
import edu.stanford.nlp.trees.TreeFactory;
import edu.stanford.nlp.trees.LabeledScoredTreeFactory;
import edu.stanford.nlp.util.*;
/** Implements Eisner and Satta style algorithms for bilexical
* PCFG parsing. The basic class provides O(n4)
* parsing, with the passed in PCFG and dependency parsers
* providing outside scores in an efficient A* search.
*
* @author Dan Klein
*/
public class BiLexPCFGParser implements KBestViterbiParser {
protected static final boolean VERBOSE = false;
protected static final boolean VERY_VERBOSE = false;
protected HookChart chart;
protected Heap- agenda;
protected int length;
protected int[] words;
protected Edge goal;
protected Interner interner;
protected Scorer scorer;
protected ExhaustivePCFGParser fscorer;
protected ExhaustiveDependencyParser dparser;
protected GrammarProjection projection;
//pair dep scores
protected BinaryGrammar bg;
protected UnaryGrammar ug;
protected DependencyGrammar dg;
protected Lexicon lex;
protected Options op;
protected List
[] taggedWordList;
protected final Index wordIndex;
protected final Index tagIndex;
protected final Index stateIndex;
protected CoreLabel[] originalLabels;
protected TreeFactory tf = new LabeledScoredTreeFactory();
// temp
protected long relaxHook1 = 0;
protected long relaxHook2 = 0;
protected long relaxHook3 = 0;
protected long relaxHook4 = 0;
protected long builtHooks = 0;
protected long builtEdges = 0;
protected long extractedHooks = 0;
protected long extractedEdges = 0;
private static final double TOL = 1e-10;
protected static boolean better(double x, double y) {
return ((x - y) / (Math.abs(x) + Math.abs(y) + 1e-100) > TOL);
}
public double getBestScore() {
if (goal == null) {
return Double.NEGATIVE_INFINITY;
} else {
return goal.score();
}
}
protected Tree extractParse(Edge edge) {
String head = wordIndex.get(words[edge.head]);
String tag = tagIndex.get(edge.tag);
String state = stateIndex.get(edge.state);
Label label = new CategoryWordTag(state, head, tag);
if (edge.backEdge == null && edge.backHook == null) {
// leaf, but needs word terminal
Tree leaf;
if (originalLabels[edge.head] != null) {
leaf = tf.newLeaf(originalLabels[edge.head]);
} else {
leaf = tf.newLeaf(head);
}
List childList = Collections.singletonList(leaf);
return tf.newTreeNode(label, childList);
}
if (edge.backHook == null) {
// unary
List childList = Collections.singletonList(extractParse(edge.backEdge));
return tf.newTreeNode(label, childList);
}
// binary
List children = new ArrayList();
if (edge.backHook.isPreHook()) {
children.add(extractParse(edge.backEdge));
children.add(extractParse(edge.backHook.backEdge));
} else {
children.add(extractParse(edge.backHook.backEdge));
children.add(extractParse(edge.backEdge));
}
return tf.newTreeNode(label, children);
}
/**
* Return the best parse of the sentence most recently parsed.
*
* @return The best (highest score) tree
*/
public Tree getBestParse() {
return extractParse(goal);
}
public boolean hasParse() {
return goal != null && goal.iScore != Double.NEGATIVE_INFINITY;
}
// Added by Dan Zeman to store the list of N best trees.
protected List nGoodTrees = new LinkedList();
/**
* Return the list of k "good" parses of the sentence most recently parsed.
* (The first is guaranteed to be the best, but later ones are only
* guaranteed the best subject to the possibilities that disappear because
* the PCFG/Dep charts only store the best over each span.)
*
* @return The list of k best trees
*/
public List> getKGoodParses(int k) {
List> nGoodTreesList = new ArrayList>(op.testOptions.printFactoredKGood);
for (Edge e : nGoodTrees) {
nGoodTreesList.add(new ScoredObject(extractParse(e), e.iScore));
}
return nGoodTreesList;
}
/** Get the exact k best parses for the sentence.
*
* @param k The number of best parses to return
* @return The exact k best parses for the sentence, with
* each accompanied by its score (typically a
* negative log probability).
*/
public List> getKBestParses(int k) {
throw new UnsupportedOperationException("BiLexPCFGParser doesn't support k best parses");
}
/** Get a complete set of the maximally scoring parses for a sentence,
* rather than one chosen at random. This set may be of size 1 or larger.
*
* @return All the equal best parses for a sentence, with each
* accompanied by its score
*/
public List> getBestParses() {
throw new UnsupportedOperationException("BiLexPCFGParser doesn't support best parses");
}
/** Get k parse samples for the sentence. It is expected that the
* parses are sampled based on their relative probability.
*
* @param k The number of sampled parses to return
* @return A list of k parse samples for the sentence, with
* each accompanied by its score
*/
public List> getKSampledParses(int k) {
throw new UnsupportedOperationException("BiLexPCFGParser doesn't support k sampled parses");
}
protected Edge tempEdge;
protected void combine(Edge edge, Hook hook) {
if (VERBOSE) {
System.err.println("Combining: " + edge + " and " + hook);
}
// make result edge
if (hook.isPreHook()) {
tempEdge.start = edge.start;
tempEdge.end = hook.end;
} else {
tempEdge.start = hook.start;
tempEdge.end = edge.end;
}
tempEdge.state = hook.state;
tempEdge.head = hook.head;
tempEdge.tag = hook.tag;
tempEdge.iScore = hook.iScore + edge.iScore;
tempEdge.backEdge = edge;
tempEdge.backHook = hook;
relaxTempEdge();
}
protected void relaxTempEdge() {
// if (tempEdge.iScore > scorer.iScore(tempEdge)+1e-4) {
// System.err.println(tempEdge+" has i "+tempEdge.iScore+" iE "+scorer.iScore(tempEdge));
// }
Edge resultEdge = (Edge) interner.intern(tempEdge);
if (VERBOSE) {
System.err.printf("Formed %s %s %.2f was %.2f better? %b\n", (resultEdge == tempEdge ? "new" : "pre-existing"), resultEdge, tempEdge.iScore, resultEdge.iScore, better(tempEdge.iScore, resultEdge.iScore));
}
if (resultEdge == tempEdge) {
tempEdge = new Edge(op.testOptions.exhaustiveTest);
discoverEdge(resultEdge);
} else {
if (better(tempEdge.iScore, resultEdge.iScore) && resultEdge.oScore > Double.NEGATIVE_INFINITY) {
// we've found a better way of making an edge that may make a parse
double back = resultEdge.iScore;
Edge backE = resultEdge.backEdge;
Hook backH = resultEdge.backHook;
resultEdge.iScore = tempEdge.iScore;
resultEdge.backEdge = tempEdge.backEdge;
resultEdge.backHook = tempEdge.backHook;
try {
agenda.decreaseKey(resultEdge);
} catch (NullPointerException e) {
if (false) {
System.err.println("");
System.err.println("Old backEdge: " + backE + " i " + backE.iScore + " o " + backE.oScore + " s " + backE.score());
System.err.println("Old backEdge: " + backE + " iE " + scorer.iScore(backE));
System.err.println("Old backHook: " + backH + " i " + backH.iScore + " o " + backH.oScore + " s " + backH.score());
System.err.println("New backEdge: " + tempEdge.backEdge + " i " + tempEdge.backEdge.iScore + " o " + tempEdge.backEdge.oScore + " s " + tempEdge.backEdge.score());
System.err.println("New backEdge: " + tempEdge.backEdge + " iE " + scorer.iScore(tempEdge.backEdge));
System.err.println("New backHook: " + tempEdge.backHook + " i " + tempEdge.backHook.iScore + " o " + tempEdge.backHook.oScore + " s " + tempEdge.backHook.score());
System.err.println("ERROR: Formed " + resultEdge + " i " + tempEdge.iScore + " o " + resultEdge.oScore + " s " + resultEdge.score());
System.err.println("ERROR: Formed " + resultEdge + " " + (resultEdge == tempEdge ? "new" : "old") + " " + tempEdge.iScore + " was " + back + " better? " + better(tempEdge.iScore, back));
}
}
}
}
}
protected void discoverEdge(Edge edge) {
// create new edge
edge.oScore = scorer.oScore(edge);
agenda.add(edge);
builtEdges++;
}
protected void discoverHook(Hook hook) {
hook.oScore = buildOScore(hook);
if (hook.oScore == Double.NEGATIVE_INFINITY) {
relaxHook4++;
}
builtHooks++;
agenda.add(hook);
}
protected double buildOScore(Hook hook) {
double bestOScore = Double.NEGATIVE_INFINITY;
Edge iTemp = new Edge(op.testOptions.exhaustiveTest);
Edge oTemp = new Edge(op.testOptions.exhaustiveTest);
iTemp.head = hook.head;
iTemp.tag = hook.tag;
iTemp.state = hook.subState;
oTemp.head = hook.head;
oTemp.tag = hook.tag;
oTemp.state = hook.state;
if (hook.isPreHook()) {
iTemp.end = hook.start;
oTemp.end = hook.end;
for (int start = 0; start <= hook.head; start++) {
iTemp.start = start;
oTemp.start = start;
double oScore = scorer.oScore(oTemp) + scorer.iScore(iTemp);
//System.err.println("Score for "+hook+" is i "+iTemp+" ("+scorer.iScore(iTemp)+") o "+oTemp+" ("+scorer.oScore(oTemp)+")");
bestOScore = SloppyMath.max(bestOScore, oScore);
}
} else {
iTemp.start = hook.end;
oTemp.start = hook.start;
for (int end = hook.head + 1; end <= length; end++) {
iTemp.end = end;
oTemp.end = end;
double oScore = scorer.oScore(oTemp) + scorer.iScore(iTemp);
bestOScore = SloppyMath.max(bestOScore, oScore);
}
}
return bestOScore;
}
protected Hook tempHook;
protected void projectHooks(Edge edge) {
// form hooks
// POST HOOKS
//for (Iterator rI = bg.ruleIteratorByLeftChild(edge.state);
// rI.hasNext(); ) {
List ruleList = bg.ruleListByLeftChild(edge.state);
for (int r = 0, rsz = ruleList.size(); r < rsz; r++) {
//BinaryRule br = rI.next();
BinaryRule br = ruleList.get(r);
if(scorer instanceof LatticeScorer) {
LatticeScorer lscorer = (LatticeScorer) scorer;
Edge latEdge = (Edge) lscorer.convertItemSpan(new Edge(edge));
if (!fscorer.oPossibleL(project(br.parent), latEdge.start) || !fscorer.iPossibleL(project(br.rightChild), latEdge.end)) {
if (!op.testOptions.exhaustiveTest) {
continue;
}
}
} else {
if (!fscorer.oPossibleL(project(br.parent), edge.start) || !fscorer.iPossibleL(project(br.rightChild), edge.end)) {
if (!op.testOptions.exhaustiveTest) {
continue;
}
}
}
for (int head = edge.end; head < length; head++) {
// cdm Apr 2006: avoid Iterator allocation
// for (Iterator iTWI = taggedWordList[head].iterator(); iTWI.hasNext();) {
// IntTaggedWord iTW = (IntTaggedWord) iTWI.next();
for (int hdi = 0, sz = taggedWordList[head].size(); hdi < sz; hdi++) {
IntTaggedWord iTW = taggedWordList[head].get(hdi);
int tag = iTW.tag;
tempHook.start = edge.start;
tempHook.end = edge.end;
tempHook.head = head;
tempHook.tag = tag;
tempHook.state = br.parent;
tempHook.subState = br.rightChild;
if (!chart.isBuiltL(tempHook.subState, tempHook.end, tempHook.head, tempHook.tag)) {
continue;
}
tempHook.iScore = edge.iScore + br.score + dparser.headScore[dparser.binDistance[head][edge.end]][head][dg.tagBin(tag)][edge.head][dg.tagBin(edge.tag)] + dparser.headStop[edge.head][dg.tagBin(edge.tag)][edge.start] + dparser.headStop[edge.head][dg.tagBin(edge.tag)][edge.end];
tempHook.backEdge = edge;
relaxTempHook();
}
}
}
// PRE HOOKS
//for (Iterator rI = bg.ruleIteratorByRightChild(edge.state);
// rI.hasNext(); ) {
ruleList = bg.ruleListByRightChild(edge.state);
for (int r = 0, rlSize = ruleList.size(); r < rlSize; r++) {
//BinaryRule br = rI.next();
BinaryRule br = ruleList.get(r);
if(scorer instanceof LatticeScorer) {
LatticeScorer lscorer = (LatticeScorer) scorer;
Edge latEdge = (Edge) lscorer.convertItemSpan(new Edge(edge));
if (!fscorer.oPossibleR(project(br.parent), latEdge.end) || !fscorer.iPossibleR(project(br.leftChild), latEdge.start)) {
if (!op.testOptions.exhaustiveTest) {
continue;
}
}
} else {
if (!fscorer.oPossibleR(project(br.parent), edge.end) || !fscorer.iPossibleR(project(br.leftChild), edge.start)) {
if (!op.testOptions.exhaustiveTest) {
continue;
}
}
}
for (int head = 0; head < edge.start; head++) {
// cdm Apr 2006: avoid Iterator allocation
// for (Iterator iTWI = taggedWordList[head].iterator(); iTWI.hasNext();) {
//IntTaggedWord iTW = (IntTaggedWord) iTWI.next();
for (int hdi = 0, sz = taggedWordList[head].size(); hdi < sz; hdi++) {
IntTaggedWord iTW = taggedWordList[head].get(hdi);
int tag = iTW.tag;
tempHook.start = edge.start;
tempHook.end = edge.end;
tempHook.head = head;
tempHook.tag = tag;
tempHook.state = br.parent;
tempHook.subState = br.leftChild;
if (!chart.isBuiltR(tempHook.subState, tempHook.start, tempHook.head, tempHook.tag)) {
continue;
}
tempHook.iScore = edge.iScore + br.score + dparser.headScore[dparser.binDistance[head][edge.start]][head][dg.tagBin(tag)][edge.head][dg.tagBin(edge.tag)] + dparser.headStop[edge.head][dg.tagBin(edge.tag)][edge.start] + dparser.headStop[edge.head][dg.tagBin(edge.tag)][edge.end];
tempHook.backEdge = edge;
relaxTempHook();
}
}
}
}
protected void registerReal(Edge real) {
chart.registerRealEdge(real);
}
protected void triggerHooks(Edge edge) {
// we might have built a synth edge, enabling some old real edges to project hooks (the difference between this method and triggerAllHooks is that here we look only at realEdges)
boolean newL = !chart.isBuiltL(edge.state, edge.start, edge.head, edge.tag);
boolean newR = !chart.isBuiltR(edge.state, edge.end, edge.head, edge.tag);
if (VERY_VERBOSE) {
if (newL) {
System.err.println("Triggering on L: " + edge);
}
if (newR) {
System.err.println("Triggering on R: " + edge);
}
}
chart.registerEdgeIndexes(edge);
if (newR) {
// PRE HOOKS
BinaryRule[] rules = bg.splitRulesWithLC(edge.state);
for (BinaryRule br : rules) {
Collection realEdges = chart.getRealEdgesWithL(br.rightChild, edge.end);
for (Edge real : realEdges) {
tempHook.start = real.start;
tempHook.end = real.end;
tempHook.state = br.parent;
tempHook.subState = br.leftChild;
tempHook.head = edge.head;
tempHook.tag = edge.tag;
tempHook.backEdge = real;
tempHook.iScore = real.iScore + br.score + dparser.headScore[dparser.binDistance[edge.head][edge.end]][edge.head][dg.tagBin(edge.tag)][real.head][dg.tagBin(real.tag)] + dparser.headStop[real.head][dg.tagBin(real.tag)][real.start] + dparser.headStop[real.head][dg.tagBin(real.tag)][real.end];
relaxTempHook();
}
}
}
if (newL) {
// POST HOOKS
BinaryRule[] rules = bg.splitRulesWithRC(edge.state);
for (BinaryRule br : rules) {
Collection realEdges = chart.getRealEdgesWithR(br.leftChild, edge.start);
for (Edge real : realEdges) {
tempHook.start = real.start;
tempHook.end = real.end;
tempHook.state = br.parent;
tempHook.subState = br.rightChild;
tempHook.head = edge.head;
tempHook.tag = edge.tag;
tempHook.backEdge = real;
tempHook.iScore = real.iScore + br.score + dparser.headScore[dparser.binDistance[edge.head][edge.start]][edge.head][dg.tagBin(edge.tag)][real.head][dg.tagBin(real.tag)] + dparser.headStop[real.head][dg.tagBin(real.tag)][real.start] + dparser.headStop[real.head][dg.tagBin(real.tag)][real.end];
relaxTempHook();
}
}
}
}
protected void triggerAllHooks(Edge edge) {
// we might have built a new edge, enabling some old edges to project hooks
boolean newL = !chart.isBuiltL(edge.state, edge.start, edge.head, edge.tag);
boolean newR = !chart.isBuiltR(edge.state, edge.end, edge.head, edge.tag);
if (VERY_VERBOSE) {
if (newL) {
System.err.println("Triggering on L: " + edge);
}
if (newR) {
System.err.println("Triggering on R: " + edge);
}
}
chart.registerEdgeIndexes(edge);
if (newR) {
// PRE HOOKS
for (Iterator rI = bg.ruleIteratorByLeftChild(edge.state); rI.hasNext();) {
BinaryRule br = rI.next();
Collection edges = chart.getRealEdgesWithL(br.rightChild, edge.end);
for (Edge real : edges) {
tempHook.start = real.start;
tempHook.end = real.end;
tempHook.state = br.parent;
tempHook.subState = br.leftChild;
tempHook.head = edge.head;
tempHook.tag = edge.tag;
tempHook.backEdge = real;
tempHook.iScore = real.iScore + br.score + dparser.headScore[dparser.binDistance[edge.head][edge.end]][edge.head][dg.tagBin(edge.tag)][real.head][dg.tagBin(real.tag)] + dparser.headStop[real.head][dg.tagBin(real.tag)][real.start] + dparser.headStop[real.head][dg.tagBin(real.tag)][real.end];
relaxTempHook();
}
}
}
if (newL) {
// POST HOOKS
for (Iterator rI = bg.ruleIteratorByRightChild(edge.state); rI.hasNext();) {
BinaryRule br = (BinaryRule) rI.next();
Collection edges = chart.getRealEdgesWithR(br.leftChild, edge.start);
if (VERBOSE) {
System.err.println("Looking for: " + stateIndex.get(br.leftChild) + " ending at " + edge.start);
System.err.println("Found: " + edges);
}
for (Edge real : edges) {
tempHook.start = real.start;
tempHook.end = real.end;
tempHook.state = br.parent;
tempHook.subState = br.rightChild;
tempHook.head = edge.head;
tempHook.tag = edge.tag;
tempHook.backEdge = real;
tempHook.iScore = real.iScore + br.score + dparser.headScore[dparser.binDistance[edge.head][edge.start]][edge.head][dg.tagBin(edge.tag)][real.head][dg.tagBin(real.tag)] + dparser.headStop[real.head][dg.tagBin(real.tag)][real.start] + dparser.headStop[real.head][dg.tagBin(real.tag)][real.end];
relaxTempHook();
}
}
}
}
protected void relaxTempHook() {
relaxHook1++;
if (VERBOSE) {
System.err.println("Considering: " + tempHook + " iP: " + scorer.iPossible(tempHook) + " oP: " + scorer.oPossible(tempHook));
}
if (!op.testOptions.exhaustiveTest) {
if (!scorer.oPossible(tempHook) || !scorer.iPossible(tempHook)) {
return;
}
}
relaxHook2++;
Hook resultHook = (Hook) interner.intern(tempHook);
if (VERBOSE) {
System.err.printf("Formed %s %s %f was %f\n", resultHook, (resultHook == tempHook ? "new" : "old"), tempHook.iScore, resultHook.iScore);
if (resultHook.backEdge != null) {
System.err.println(" Backtrace: " + resultHook.backEdge);
}
}
if (resultHook == tempHook) {
relaxHook3++;
tempHook = new Hook(op.testOptions.exhaustiveTest);
discoverHook(resultHook);
}
if (better(tempHook.iScore, resultHook.iScore)) {
resultHook.iScore = tempHook.iScore;
resultHook.backEdge = tempHook.backEdge;
try {
agenda.decreaseKey(resultHook);
} catch (NullPointerException e) {
}
}
}
protected void projectUnaries(Edge edge) {
for (Iterator rI = ug.ruleIteratorByChild(edge.state); rI.hasNext();) {
UnaryRule ur = (UnaryRule) rI.next();
if (ur.child == ur.parent) {
continue;
}
tempEdge.start = edge.start;
tempEdge.end = edge.end;
tempEdge.head = edge.head;
tempEdge.tag = edge.tag;
tempEdge.state = ur.parent;
tempEdge.backEdge = edge;
tempEdge.backHook = null;
tempEdge.iScore = edge.iScore + ur.score;
relaxTempEdge();
}
}
protected void processEdge(Edge edge) {
// add to chart
if (VERBOSE) {
System.err.println("Adding to chart: " + edge);
}
chart.addEdge(edge);
// fetch existing hooks that can combine with it and combine them
for (Hook hook : chart.getPreHooks(edge)) {
combine(edge, hook);
}
for (Hook hook : chart.getPostHooks(edge)) {
combine(edge, hook);
}
// do projections
//if (VERBOSE) System.err.println("Projecting: "+edge);
projectUnaries(edge);
if (!bg.isSynthetic(edge.state) && !op.freeDependencies) {
projectHooks(edge);
registerReal(edge);
}
if (op.freeDependencies) {
projectHooks(edge);
registerReal(edge);
triggerAllHooks(edge);
} else {
triggerHooks(edge);
}
}
protected void processHook(Hook hook) {
// add to chart
//if (VERBOSE) System.err.println("Adding to chart: "+hook);
chart.addHook(hook);
Collection edges = chart.getEdges(hook);
for (Edge edge : edges) {
combine(edge, hook);
}
}
protected void processItem(Item item) {
if (item.isEdge()) {
processEdge((Edge) item);
} else {
processHook((Hook) item);
}
}
protected void discoverItem(Item item) {
if (item.isEdge()) {
discoverEdge((Edge) item);
} else {
discoverHook((Hook) item);
}
}
protected Item makeInitialItem(int pos, int tag, int state, double iScore) {
Edge edge = new Edge(op.testOptions.exhaustiveTest);
edge.start = pos;
edge.end = pos + 1;
edge.state = state;
edge.head = pos;
edge.tag = tag;
edge.iScore = iScore;
return edge;
}
protected List- makeInitialItems(List wordList) {
List
- itemList = new ArrayList
- ();
int length = wordList.size();
int numTags = tagIndex.size();
words = new int[length];
taggedWordList = new List[length];
int terminalCount = 0;
originalLabels = new CoreLabel[wordList.size()];
for (int i = 0; i < length; i++) {
taggedWordList[i] = new ArrayList
(numTags);
HasWord wordObject = wordList.get(i);
if (wordObject instanceof CoreLabel) {
originalLabels[i] = (CoreLabel) wordObject;
}
String wordStr = wordObject.word();
//Word context (e.g., morphosyntactic info)
String wordContextStr = null;
if(wordObject instanceof HasContext) {
wordContextStr = ((HasContext) wordObject).originalText();
if("".equals(wordContextStr))
wordContextStr = null;
}
if (!wordIndex.contains(wordStr)) {
wordStr = Lexicon.UNKNOWN_WORD;
}
int word = wordIndex.indexOf(wordStr);
words[i] = word;
for (Iterator tagI = lex.ruleIteratorByWord(word, i, wordContextStr); tagI.hasNext(); ) {
IntTaggedWord tagging = tagI.next();
int tag = tagging.tag;
//String curTagStr = tagIndex.get(tag);
//if (!tagStr.equals("") && !tagStr.equals(curTagStr))
// continue;
int state = stateIndex.indexOf(tagIndex.get(tag));
//itemList.add(makeInitialItem(i,tag,state,1.0*tagging.score));
// THIS WILL CAUSE BUGS!!! Don't use with another A* scorer
tempEdge.state = state;
tempEdge.head = i;
tempEdge.start = i;
tempEdge.end = i + 1;
tempEdge.tag = tag;
itemList.add(makeInitialItem(i, tag, state, scorer.iScore(tempEdge)));
terminalCount++;
taggedWordList[i].add(new IntTaggedWord(word, tag));
}
}
if (op.testOptions.verbose) {
System.err.println("Terminals (# of tag edges in chart): " +
terminalCount);
}
return itemList;
}
protected void scoreDependencies() {
// just leach it off the dparser for now...
/*
IntDependency dependency = new IntDependency();
for (int head = 0; head < words.length; head++) {
for (int hTag = 0; hTag < tagIndex.size(); hTag++) {
for (int arg = 0; arg < words.length; arg++) {
for (int aTag = 0; aTag < tagIndex.size(); aTag++) {
Arrays.fill(depScore[head][hTag][arg][aTag],Float.NEGATIVE_INFINITY);
}
}
}
}
for (int head = 0; head < words.length; head++) {
for (int arg = 0; arg < words.length; arg++) {
if (head == arg)
continue;
for (Iterator headTWI=taggedWordList[head].iterator(); headTWI.hasNext();) {
IntTaggedWord headTW = headTWI.next();
for (Iterator argTWI=taggedWordList[arg].iterator(); argTWI.hasNext();) {
IntTaggedWord argTW = argTWI.next();
dependency.head = headTW;
dependency.arg = argTW;
dependency.leftHeaded = (head < arg);
dependency.distance = Math.abs(head-arg);
depScore[head][headTW.tag][arg][argTW.tag] =
dg.score(dependency);
if (false && depScore[head][headTW.tag][arg][argTW.tag] > -100)
System.err.println(wordIndex.get(headTW.word)+"/"+tagIndex.get(headTW.tag)+" -> "+wordIndex.get(argTW.word)+"/"+tagIndex.get(argTW.tag)+" score "+depScore[head][headTW.tag][arg][argTW.tag]);
}
}
}
}
*/
}
protected void setGoal(int length) {
goal = new Edge(op.testOptions.exhaustiveTest);
goal.start = 0;
goal.end = length;
goal.state = stateIndex.indexOf(op.langpack().startSymbol());
goal.tag = tagIndex.indexOf(Lexicon.BOUNDARY_TAG);
goal.head = length - 1;
//goal = (Edge)interner.intern(goal);
}
protected void initialize(List words) {
length = words.size();
interner = new Interner();
agenda = new ArrayHeap- (ScoredComparator.DESCENDING_COMPARATOR);
chart = new HookChart();
setGoal(length);
List
- initialItems = makeInitialItems(words);
// scoreDependencies();
for (int i = 0, iiSize = initialItems.size(); i < iiSize; i++) {
Item item = initialItems.get(i);
item = (Item) interner.intern(item);
//if (VERBOSE) System.err.println("Initial: "+item);
discoverItem(item);
}
}
/**
* Parse a Sentence.
*
* @return true iff it could be parsed
*/
public boolean parse(List words) {
int nGoodRemaining = 0;
if (op.testOptions.printFactoredKGood > 0) {
nGoodRemaining = op.testOptions.printFactoredKGood;
nGoodTrees.clear();
}
int spanFound = 0;
long last = 0;
int exHook = 0;
relaxHook1 = 0;
relaxHook2 = 0;
relaxHook3 = 0;
relaxHook4 = 0;
builtHooks = 0;
builtEdges = 0;
extractedHooks = 0;
extractedEdges = 0;
if (op.testOptions.verbose) {
Timing.tick("Starting combined parse.");
}
dparser.binDistance = dparser.binDistance; // THIS IS TERRIBLE, BUT SAVES MEMORY
initialize(words);
while (!agenda.isEmpty()) {
Item item = agenda.extractMin();
if (!item.isEdge()) {
exHook++;
extractedHooks++;
} else {
extractedEdges++;
}
if (relaxHook1 > last + 1000000) {
last = relaxHook1;
if (op.testOptions.verbose) {
System.err.println("Proposed hooks: " + relaxHook1);
System.err.println("Unfiltered hooks: " + relaxHook2);
System.err.println("Built hooks: " + relaxHook3);
System.err.println("Waste hooks: " + relaxHook4);
System.err.println("Extracted hooks: " + exHook);
}
}
if (item.end - item.start > spanFound) {
spanFound = item.end - item.start;
if (op.testOptions.verbose) {
System.err.print(spanFound + " ");
}
}
//if (item.end < 5) System.err.println("Extracted: "+item+" iScore "+item.iScore+" oScore "+item.oScore+" score "+item.score());
if (item.equals(goal)) {
if (op.testOptions.verbose) {
System.err.println("Found goal!");
System.err.println("Comb iScore " + item.iScore); // was goal.iScore
Timing.tick("Done, parse found.");
System.err.println("Built items: " + (builtEdges + builtHooks));
System.err.println("Built hooks: " + builtHooks);
System.err.println("Built edges: " + builtEdges);
System.err.println("Extracted items: " + (extractedEdges + extractedHooks));
System.err.println("Extracted hooks: " + extractedHooks);
System.err.println("Extracted edges: " + extractedEdges);
//postMortem();
}
if (op.testOptions.printFactoredKGood <= 0) {
goal = (Edge) item;
interner = null;
agenda = null;
return true;
} else {
// Store the parse
goal = (Edge) item;
nGoodTrees.add(goal);
nGoodRemaining--;
if (nGoodRemaining > 0) {
if (VERBOSE) {
System.err.println("Found parse! Number of remaining trees to find = " + nGoodRemaining);
}
} else {
if (VERBOSE) {
System.err.println("Found last parse!");
}
interner = null;
agenda = null;
return true;
}
}
}
// Is the currently best item acceptable at all?
if (item.score() == Double.NEGATIVE_INFINITY) {
// Do not report failure in nGood mode if we found something earlier.
if (nGoodTrees.size() > 0) {
if (VERBOSE) {
System.err.println("Aborting kGood search because of an unacceptable (-Inf) item: " + item);
}
goal = nGoodTrees.get(0);
interner = null;
agenda = null;
return true;
}
System.err.println("FactoredParser: no consistent parse [hit A*-blocked edges, aborting].");
if (op.testOptions.verbose) {
Timing.tick("FactoredParser: no consistent parse [hit A*-blocked edges, aborting].");
}
return false;
}
// Keep the number of items from getting too large
if (op.testOptions.MAX_ITEMS > 0 && (builtEdges + builtHooks) >= op.testOptions.MAX_ITEMS) {
// Do not report failure in kGood mode if we found something earlier.
if (nGoodTrees.size() > 0) {
System.err.println("DEBUG: aborting search because of reaching the MAX_ITEMS work limit [" +
op.testOptions.MAX_ITEMS + " items]");
goal = nGoodTrees.get(0);
interner = null;
agenda = null;
return true;
}
System.err.println("FactoredParser: exceeded MAX_ITEMS work limit [" +
op.testOptions.MAX_ITEMS + " items]; aborting.");
if (op.testOptions.verbose) {
Timing.tick("FactoredParser: exceeded MAX_ITEMS work limit [" +
op.testOptions.MAX_ITEMS + " items]; aborting.");
}
return false;
}
if (VERBOSE && item.score() != Double.NEGATIVE_INFINITY) {
System.err.printf("Removing from agenda: %s score i %.2f + o %.2f = %.2f\n", item, item.iScore, item.oScore, item.score());
if (item.backEdge != null) {
System.err.println(" Backtrace: " + item.backEdge.toString() + " " + (item.isEdge() ? (((Edge) item).backHook != null ? ((Edge) item).backHook.toString() : "") : ""));
}
}
processItem(item);
} // end while agenda is not empty
// If we are here, the agenda is empty.
// Do not report failure if we found something earlier.
if (nGoodTrees.size() > 0) {
System.err.println("DEBUG: aborting search because of empty agenda");
goal = nGoodTrees.get(0);
interner = null;
agenda = null;
return true;
}
System.err.println("FactoredParser: emptied agenda, no parse found!");
if (op.testOptions.verbose) {
Timing.tick("FactoredParser: emptied agenda, no parse found!");
}
return false;
}
protected void postMortem() {
int numHooks = 0;
int numEdges = 0;
int numUnmatchedHooks = 0;
int total = agenda.size();
int done = 0;
while (!agenda.isEmpty()) {
Item item = agenda.extractMin();
done++;
//if(done % (total/10) == 0)
// System.err.println("Scanning: "+100*done/total);
if (item.isEdge()) {
numEdges++;
} else {
numHooks++;
Collection edges = chart.getEdges((Hook) item);
if (edges.size() == 0) {
numUnmatchedHooks++;
}
}
}
System.err.println("--- Agenda Post-Mortem ---");
System.err.println("Edges: " + numEdges);
System.err.println("Hooks: " + numHooks);
System.err.println("Unmatched Hooks: " + numUnmatchedHooks);
}
protected int project(int state) {
return projection.project(state);
}
public BiLexPCFGParser(Scorer scorer, ExhaustivePCFGParser fscorer, ExhaustiveDependencyParser dparser, BinaryGrammar bg, UnaryGrammar ug, DependencyGrammar dg, Lexicon lex, Options op, Index
stateIndex, Index wordIndex, Index tagIndex) {
this(scorer, fscorer, dparser, bg, ug, dg, lex, op, new NullGrammarProjection(bg, ug), stateIndex, wordIndex, tagIndex);
}
BiLexPCFGParser(Scorer scorer, ExhaustivePCFGParser fscorer, ExhaustiveDependencyParser dparser, BinaryGrammar bg, UnaryGrammar ug, DependencyGrammar dg, Lexicon lex, Options op, GrammarProjection projection, Index stateIndex, Index wordIndex, Index tagIndex) {
this.fscorer = fscorer;
this.projection = projection;
this.dparser = dparser;
this.scorer = scorer;
this.bg = bg;
this.ug = ug;
this.dg = dg;
this.lex = lex;
this.op = op;
this.stateIndex = stateIndex;
this.wordIndex = wordIndex;
this.tagIndex = tagIndex;
tempEdge = new Edge(op.testOptions.exhaustiveTest);
tempHook = new Hook(op.testOptions.exhaustiveTest);
}
public static class N5BiLexPCFGParser extends BiLexPCFGParser {
@Override
protected void relaxTempHook() {
relaxHook1++;
if (VERBOSE) {
System.err.println("Considering: " + tempHook + " iP: " + scorer.iPossible(tempHook) + " oP: " + scorer.oPossible(tempHook));
}
if (!op.testOptions.exhaustiveTest) {
if (!scorer.oPossible(tempHook) || !scorer.iPossible(tempHook)) {
return;
}
}
relaxHook2++;
Hook resultHook = tempHook;
//Hook resultHook = (Hook)interner.intern(tempHook);
if (VERBOSE) {
System.err.println("Formed " + resultHook + " " + (resultHook == tempHook ? "new" : "old") + " " + tempHook.iScore + " was " + resultHook.iScore);
}
if (resultHook == tempHook) {
relaxHook3++;
tempHook = new Hook(op.testOptions.exhaustiveTest);
processHook(resultHook);
builtHooks++;
}
}
N5BiLexPCFGParser(Scorer scorer, ExhaustivePCFGParser fscorer, ExhaustiveDependencyParser leach, BinaryGrammar bg, UnaryGrammar ug, DependencyGrammar dg, Lexicon lex, Options op, Index stateIndex, Index wordIndex, Index tagIndex) {
super(scorer, fscorer, leach, bg, ug, dg, lex, op, new NullGrammarProjection(bg, ug), stateIndex, wordIndex, tagIndex);
}
N5BiLexPCFGParser(Scorer scorer, ExhaustivePCFGParser fscorer, ExhaustiveDependencyParser leach, BinaryGrammar bg, UnaryGrammar ug, DependencyGrammar dg, Lexicon lex, Options op, GrammarProjection proj, Index stateIndex, Index wordIndex, Index tagIndex) {
super(scorer, fscorer, leach, bg, ug, dg, lex, op, proj, stateIndex, wordIndex, tagIndex);
}
} // end class N5BiLexPCFGParser
} // end class BiLexPCFGParser