// Stanford Parser -- a probabilistic lexicalized NL CFG parser
// Copyright (c) 2002, 2003, 2004, 2005 The Board of Trustees of
// The Leland Stanford Junior University. All Rights Reserved.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// For more information, bug reports, fixes, contact:
// Christopher Manning
// Dept of Computer Science, Gates 1A
// Stanford CA 94305-9010
// USA
// parser-support@lists.stanford.edu
// http://nlp.stanford.edu/downloads/lex-parser.shtml
package edu.stanford.nlp.parser.lexparser;
import edu.stanford.nlp.io.EncodingPrintWriter;
import edu.stanford.nlp.ling.CoreLabel;
import edu.stanford.nlp.ling.HasContext;
import edu.stanford.nlp.ling.HasOffset;
import edu.stanford.nlp.ling.HasTag;
import edu.stanford.nlp.ling.HasWord;
import edu.stanford.nlp.math.SloppyMath;
import edu.stanford.nlp.parser.KBestViterbiParser;
import edu.stanford.nlp.parser.common.ParserAnnotations;
import edu.stanford.nlp.parser.common.ParserConstraint;
import edu.stanford.nlp.trees.TreeFactory;
import edu.stanford.nlp.trees.TreebankLanguagePack;
import edu.stanford.nlp.trees.Tree;
import edu.stanford.nlp.trees.LabeledScoredTreeFactory;
import edu.stanford.nlp.util.*;
import edu.stanford.nlp.util.PriorityQueue;
import java.util.*;
import java.util.regex.Matcher;
/** An exhaustive generalized CKY PCFG parser.
* Fairly carefully optimized to be fast.
* <br>
* If reusing this object for multiple parses, remember to correctly
* set any options such as the constraints field.
*
* @author Dan Klein
* @author Christopher Manning (I seem to maintain it....)
* @author Jenny Finkel (N-best and sampling code, former from Liang/Chiang)
*/
public class ExhaustivePCFGParser implements Scorer, KBestViterbiParser {
// public static long insideTime = 0; // for profiling
// public static long outsideTime = 0;
protected final String goalStr;
protected final Index<String> stateIndex;
protected final Index<String> wordIndex;
protected final Index<String> tagIndex;
protected final TreeFactory tf;
protected final BinaryGrammar bg;
protected final UnaryGrammar ug;
protected final Lexicon lex;
protected final Options op;
protected final TreebankLanguagePack tlp;
protected OutsideRuleFilter orf;
// inside scores
protected float[][][] iScore; // start idx, end idx, state -> logProb (ragged; null for end <= start)
// outside scores
protected float[][][] oScore; // start idx, end idx, state -> logProb
protected float bestScore;
protected int[][][] wordsInSpan; // number of words in span with this state
protected boolean[][] oFilteredStart; // [start][state]; only used by unused outsideRuleFilter
protected boolean[][] oFilteredEnd; // [end][state]; only used by unused outsideRuleFilter
protected boolean[][] iPossibleByL; // [start][state]
protected boolean[][] iPossibleByR; // [end][state]
protected boolean[][] oPossibleByL; // [start][state]
protected boolean[][] oPossibleByR; // [end][state]
protected int[] words; // words of sentence being parsed as word Numberer ints
private int[] beginOffsets;
private int[] endOffsets;
private CoreLabel[] originalCoreLabels;
private HasTag[] originalTags;
protected int length; // one larger than true length of sentence; includes boundary symbol in count
protected boolean[][] tags;
protected int myMaxLength = -0xDEADBEEF;
protected final int numStates;
protected int arraySize = 0;
/**
* When you want to force the parser to parse a particular
* subsequence into a particular state. Parses will only be made
* where there is a constituent over the given span which matches
* (as regular expression) the state Pattern given. See the
* documentation of the ParserConstraint class for information on
* specifying a ParserConstraint.
* <br>
* Implementation note: It would be cleaner to make this a
* Collections.emptyList, but that actually significantly slows down
* the processing in the case of empty lists. Checking for null
* saves quite a bit of time.
*/
protected List<ParserConstraint> constraints = null;
private CoreLabel getCoreLabel(int labelIndex) {
if (originalCoreLabels[labelIndex] != null) {
CoreLabel terminalLabel = originalCoreLabels[labelIndex];
if (terminalLabel.value() == null && terminalLabel.word() != null) {
terminalLabel.setValue(terminalLabel.word());
}
return terminalLabel;
}
String wordStr = wordIndex.get(words[labelIndex]);
CoreLabel terminalLabel = new CoreLabel();
terminalLabel.setValue(wordStr);
terminalLabel.setWord(wordStr);
terminalLabel.setBeginPosition(beginOffsets[labelIndex]);
terminalLabel.setEndPosition(endOffsets[labelIndex]);
if (originalTags[labelIndex] != null) {
terminalLabel.setTag(originalTags[labelIndex].tag());
}
return terminalLabel;
}
@Override
public double oScore(Edge edge) {
double oS = oScore[edge.start][edge.end][edge.state];
if (op.testOptions.pcfgThreshold) {
double iS = iScore[edge.start][edge.end][edge.state];
if (iS + oS - bestScore < op.testOptions.pcfgThresholdValue) {
return Double.NEGATIVE_INFINITY;
}
}
return oS;
}
@Override
public double iScore(Edge edge) {
return iScore[edge.start][edge.end][edge.state];
}
@Override
public boolean oPossible(Hook hook) {
return (hook.isPreHook() ? oPossibleByR[hook.end][hook.state] : oPossibleByL[hook.start][hook.state]);
}
@Override
public boolean iPossible(Hook hook) {
return (hook.isPreHook() ? iPossibleByR[hook.start][hook.subState] : iPossibleByL[hook.end][hook.subState]);
}
public boolean oPossibleL(int state, int start) {
return oPossibleByL[start][state];
}
public boolean oPossibleR(int state, int end) {
return oPossibleByR[end][state];
}
public boolean iPossibleL(int state, int start) {
return iPossibleByL[start][state];
}
public boolean iPossibleR(int state, int end) {
return iPossibleByR[end][state];
}
protected void buildOFilter() {
oFilteredStart = new boolean[length][numStates];
oFilteredEnd = new boolean[length + 1][numStates];
orf.init();
for (int start = 0; start < length; start++) {
orf.leftAccepting(oFilteredStart[start]);
orf.advanceRight(tags[start]);
}
for (int end = length; end > 0; end--) {
orf.rightAccepting(oFilteredEnd[end]);
orf.advanceLeft(tags[end - 1]);
}
}
public double validateBinarizedTree(Tree tree, int start) {
if (tree.isLeaf()) {
return 0.0;
}
float epsilon = 0.0001f;
if (tree.isPreTerminal()) {
String wordStr = tree.children()[0].label().value();
int tag = tagIndex.indexOf(tree.label().value());
int word = wordIndex.indexOf(wordStr);
IntTaggedWord iTW = new IntTaggedWord(word, tag);
float score = lex.score(iTW, start, wordStr, null);
float bound = iScore[start][start + 1][stateIndex.indexOf(tree.label().value())];
if (score > bound + epsilon) {
System.out.println("Invalid tagging:");
System.out.println(" Tag: " + tree.label().value());
System.out.println(" Word: " + tree.children()[0].label().value());
System.out.println(" Score: " + score);
System.out.println(" Bound: " + bound);
}
return score;
}
int parent = stateIndex.indexOf(tree.label().value());
int firstChild = stateIndex.indexOf(tree.children()[0].label().value());
if (tree.numChildren() == 1) {
UnaryRule ur = new UnaryRule(parent, firstChild);
double score = SloppyMath.max(ug.scoreRule(ur), -10000.0) + validateBinarizedTree(tree.children()[0], start);
double bound = iScore[start][start + tree.yield().size()][parent];
if (score > bound + epsilon) {
System.out.println("Invalid unary:");
System.out.println(" Parent: " + tree.label().value());
System.out.println(" Child: " + tree.children()[0].label().value());
System.out.println(" Start: " + start);
System.out.println(" End: " + (start + tree.yield().size()));
System.out.println(" Score: " + score);
System.out.println(" Bound: " + bound);
}
return score;
}
int secondChild = stateIndex.indexOf(tree.children()[1].label().value());
BinaryRule br = new BinaryRule(parent, firstChild, secondChild);
double score = SloppyMath.max(bg.scoreRule(br), -10000.0) + validateBinarizedTree(tree.children()[0], start) + validateBinarizedTree(tree.children()[1], start + tree.children()[0].yield().size());
double bound = iScore[start][start + tree.yield().size()][parent];
if (score > bound + epsilon) {
System.out.println("Invalid binary:");
System.out.println(" Parent: " + tree.label().value());
System.out.println(" LChild: " + tree.children()[0].label().value());
System.out.println(" RChild: " + tree.children()[1].label().value());
System.out.println(" Start: " + start);
System.out.println(" End: " + (start + tree.yield().size()));
System.out.println(" Score: " + score);
System.out.println(" Bound: " + bound);
}
return score;
}
// needs to be set up so that uses same Train options...
public Tree scoreNonBinarizedTree(Tree tree) {
TreeAnnotatorAndBinarizer binarizer = new TreeAnnotatorAndBinarizer(op.tlpParams, op.forceCNF, !op.trainOptions.outsideFactor(), true, op);
tree = binarizer.transformTree(tree);
scoreBinarizedTree(tree, 0);
return op.tlpParams.subcategoryStripper().transformTree(new Debinarizer(op.forceCNF).transformTree(tree));
// return debinarizer.transformTree(t);
}
//
public double scoreBinarizedTree(Tree tree, int start) {
if (tree.isLeaf()) {
return 0.0;
}
if (tree.isPreTerminal()) {
String wordStr = tree.children()[0].label().value();
int tag = tagIndex.indexOf(tree.label().value());
int word = wordIndex.indexOf(wordStr);
IntTaggedWord iTW = new IntTaggedWord(word, tag);
// if (lex.score(iTW,(leftmost ? 0 : 1)) == Double.NEGATIVE_INFINITY) {
// System.out.println("NO SCORE FOR: "+iTW);
// }
float score = lex.score(iTW, start, wordStr, null);
tree.setScore(score);
return score;
}
int parent = stateIndex.indexOf(tree.label().value());
int firstChild = stateIndex.indexOf(tree.children()[0].label().value());
if (tree.numChildren() == 1) {
UnaryRule ur = new UnaryRule(parent, firstChild);
//+ DEBUG
// if (ug.scoreRule(ur) < -10000) {
// System.out.println("Grammar doesn't have rule: " + ur);
// }
// return SloppyMath.max(ug.scoreRule(ur), -10000.0) + scoreBinarizedTree(tree.children()[0], leftmost);
double score = ug.scoreRule(ur) + scoreBinarizedTree(tree.children()[0], start);
tree.setScore(score);
return score;
}
int secondChild = stateIndex.indexOf(tree.children()[1].label().value());
BinaryRule br = new BinaryRule(parent, firstChild, secondChild);
//+ DEBUG
// if (bg.scoreRule(br) < -10000) {
// System.out.println("Grammar doesn't have rule: " + br);
// }
// return SloppyMath.max(bg.scoreRule(br), -10000.0) +
// scoreBinarizedTree(tree.children()[0], leftmost) +
// scoreBinarizedTree(tree.children()[1], false);
double score = bg.scoreRule(br) + scoreBinarizedTree(tree.children()[0], start) + scoreBinarizedTree(tree.children()[1], start + tree.children()[0].yield().size());
tree.setScore(score);
return score;
}
static final boolean spillGuts = false;
static final boolean dumpTagging = false;
private long time = System.currentTimeMillis();
protected void tick(String str) {
long time2 = System.currentTimeMillis();
long diff = time2 - time;
time = time2;
System.err.print("done. " + diff + "\n" + str);
}
protected boolean floodTags = false;
protected List sentence = null;
protected Lattice lr = null;
protected int[][] narrowLExtent; // = null; // [end][state]: the rightmost left extent of state s ending at position i
protected int[][] wideLExtent; // = null; // [end][state] the leftmost left extent of state s ending at position i
protected int[][] narrowRExtent; // = null; // [start][state]: the leftmost right extent of state s starting at position i
protected int[][] wideRExtent; // = null; // [start][state] the rightmost right extent of state s starting at position i
protected final boolean[] isTag; // this records whether grammar states (stateIndex) correspond to POS tags
public boolean parse(List<? extends HasWord> sentence) {
lr = null; // better nullPointer exception than silent error
//System.out.println("is it a taggedword?" + (sentence.get(0) instanceof TaggedWord)); //debugging
if (sentence != this.sentence) {
this.sentence = sentence;
floodTags = false;
}
if (op.testOptions.verbose) {
Timing.tick("Starting pcfg parse.");
}
if (spillGuts) {
tick("Starting PCFG parse...");
}
length = sentence.size();
if (length > arraySize) {
considerCreatingArrays(length);
}
int goal = stateIndex.indexOf(goalStr);
if (op.testOptions.verbose) {
// System.out.println(numStates + " states, " + goal + " is the goal state.");
// System.err.println(new ArrayList(ug.coreRules.keySet()));
System.err.print("Initializing PCFG...");
}
// map input words to words array (wordIndex ints)
words = new int[length];
beginOffsets = new int[length];
endOffsets = new int[length];
originalCoreLabels = new CoreLabel[length];
originalTags = new HasTag[length];
int unk = 0;
StringBuilder unkWords = new StringBuilder("[");
// int unkIndex = wordIndex.size();
for (int i = 0; i < length; i++) {
String s = sentence.get(i).word();
if (sentence.get(i) instanceof HasOffset) {
HasOffset word = (HasOffset) sentence.get(i);
beginOffsets[i] = word.beginPosition();
endOffsets[i] = word.endPosition();
} else {
//Storing the positions of the word interstices
//Account for single space between words
beginOffsets[i] = ((i == 0) ? 0 : endOffsets[i - 1] + 1);
endOffsets[i] = beginOffsets[i] + s.length();
}
if (sentence.get(i) instanceof CoreLabel) {
originalCoreLabels[i] = (CoreLabel) sentence.get(i);
}
if (sentence.get(i) instanceof HasTag) {
HasTag tag = (HasTag) sentence.get(i);
if (tag.tag() != null) {
originalTags[i] = tag;
}
}
if (op.testOptions.verbose && (!wordIndex.contains(s) || !lex.isKnown(wordIndex.indexOf(s)))) {
unk++;
unkWords.append(' ');
unkWords.append(s);
unkWords.append(" { ");
for (int jj = 0; jj < s.length(); jj++) {
char ch = s.charAt(jj);
unkWords.append(Character.getType(ch)).append(" ");
}
unkWords.append("}");
}
// TODO: really, add a new word?
//words[i] = wordIndex.indexOf(s, unkIndex);
//if (words[i] == unkIndex) {
// ++unkIndex;
//}
words[i] = wordIndex.addToIndex(s);
//if (wordIndex.contains(s)) {
// words[i] = wordIndex.indexOf(s);
//} else {
// words[i] = wordIndex.indexOf(Lexicon.UNKNOWN_WORD);
//}
}
// initialize inside and outside score arrays
if (spillGuts) {
tick("Wiping arrays...");
}
if (Thread.interrupted()) {
throw new RuntimeInterruptedException();
}
for (int start = 0; start < length; start++) {
for (int end = start + 1; end <= length; end++) {
Arrays.fill(iScore[start][end], Float.NEGATIVE_INFINITY);
if (op.doDep && ! op.testOptions.useFastFactored) {
Arrays.fill(oScore[start][end], Float.NEGATIVE_INFINITY);
}
if (op.testOptions.lengthNormalization) {
Arrays.fill(wordsInSpan[start][end], 1);
}
}
}
if (Thread.interrupted()) {
throw new RuntimeInterruptedException();
}
for (int loc = 0; loc <= length; loc++) {
Arrays.fill(narrowLExtent[loc], -1); // the rightmost left with state s ending at i that we can get is the beginning
Arrays.fill(wideLExtent[loc], length + 1); // the leftmost left with state s ending at i that we can get is the end
}
for (int loc = 0; loc < length; loc++) {
Arrays.fill(narrowRExtent[loc], length + 1); // the leftmost right with state s starting at i that we can get is the end
Arrays.fill(wideRExtent[loc], -1); // the rightmost right with state s starting at i that we can get is the beginning
}
// int puncTag = stateIndex.indexOf(".");
// boolean lastIsPunc = false;
if (op.testOptions.verbose) {
Timing.tick("done.");
unkWords.append(" ]");
op.tlpParams.pw(System.err).println("Unknown words: " + unk + " " + unkWords);
System.err.print("Starting filters...");
}
if (Thread.interrupted()) {
throw new RuntimeInterruptedException();
}
// do tags
if (spillGuts) {
tick("Tagging...");
}
initializeChart(sentence);
//if (op.testOptions.outsideFilter)
// buildOFilter();
if (op.testOptions.verbose) {
Timing.tick("done.");
System.err.print("Starting insides...");
}
// do the inside probabilities
doInsideScores();
if (op.testOptions.verbose) {
// insideTime += Timing.tick("done.");
Timing.tick("done.");
System.out.println("PCFG parsing " + length + " words (incl. stop): insideScore = " + iScore[0][length][goal]);
}
bestScore = iScore[0][length][goal];
boolean succeeded = hasParse();
if (op.testOptions.doRecovery && !succeeded && !floodTags) {
floodTags = true; // sentence will try to reparse
// ms: disabled message. this is annoying and it doesn't really provide much information
//System.err.println("Trying recovery parse...");
return parse(sentence);
}
if ( ! op.doDep || op.testOptions.useFastFactored) {
return succeeded;
}
if (op.testOptions.verbose) {
System.err.print("Starting outsides...");
}
// outside scores
oScore[0][length][goal] = 0.0f;
doOutsideScores();
//System.out.println("State rate: "+((int)(1000*ohits/otries))/10.0);
//System.out.println("Traversals: "+ohits);
if (op.testOptions.verbose) {
// outsideTime += Timing.tick("Done.");
Timing.tick("done.");
}
if (op.doDep) {
initializePossibles();
}
if (Thread.interrupted()) {
throw new RuntimeInterruptedException();
}
return succeeded;
}
public boolean parse(HTKLatticeReader lr) {
//TODO wsg 20-jan-2010
// There are presently 2 issues with HTK lattice parsing:
// (1) The initializeChart() method present in rev. 19820 did not properly initialize
// lattices (or sub-lattices) like this (where A,B,C are nodes, and NN is the POS tag arc label):
//
// --NN--> B --NN--
// / \
// A ------NN-------> C
//
// (2) extractBestParse() was not implemented properly.
//
// To re-implement support for HTKLatticeReader it is necessary to create an interface
// for the two different lattice implementations and then modify initializeChart() and
// extractBestParse() as appropriate. Another solution would be to duplicate these two
// methods and make the necessary changes for HTKLatticeReader. In both cases, the
// acoustic model score provided by the HTK lattices should be included in the weighting.
//
// Note that I never actually tested HTKLatticeReader, so I am uncertain if this facility
// actually worked in the first place.
//
System.err.printf("%s: HTK lattice parsing presently disabled.\n", this.getClass().getName());
return false;
}
public boolean parse(Lattice lr) {
sentence = null; // better nullPointer exception than silent error
if (lr != this.lr) {
this.lr = lr;
floodTags = false;
}
if (op.testOptions.verbose)
Timing.tick("Doing lattice PCFG parse...");
// The number of whitespace nodes in the lattice
length = lr.getNumNodes() - 1; //Subtract 1 since considerCreatingArrays will add the final interstice
if (length > arraySize)
considerCreatingArrays(length);
int goal = stateIndex.indexOf(goalStr);
// if (op.testOptions.verbose) {
// System.err.println("Unaries: " + ug.rules());
// System.err.println("Binaries: " + bg.rules());
// System.err.println("Initializing PCFG...");
// System.err.println(" " + numStates + " states, " + goal + " is the goal state.");
// }
// System.err.println("Tagging states");
// for(int i = 0; i < numStates; i++) {
// if(isTag[i]) {
// int tagId = Numberer.translate(stateSpace, "tags", i);
// String tag = (String) tagNumberer.object(tagId);
// System.err.printf(" %d: %s\n",i,tag);
// }
// }
// Create a map of all words in the lattice
//
// int numEdges = lr.getNumEdges();
// words = new int[numEdges];
// offsets = new IntPair[numEdges];
//
// int unk = 0;
// int i = 0;
// StringBuilder unkWords = new StringBuilder("[");
// for (LatticeEdge edge : lr) {
// String s = edge.word;
// if (op.testOptions.verbose && !lex.isKnown(wordNumberer.number(s))) {
// unk++;
// unkWords.append(" " + s);
// }
// words[i++] = wordNumberer.number(s);
// }
for (int start = 0; start < length; start++) {
for (int end = start + 1; end <= length; end++) {
Arrays.fill(iScore[start][end], Float.NEGATIVE_INFINITY);
if (op.doDep) Arrays.fill(oScore[start][end], Float.NEGATIVE_INFINITY);
}
}
for (int loc = 0; loc <= length; loc++) {
Arrays.fill(narrowLExtent[loc], -1); // the rightmost left with state s ending at i that we can get is the beginning
Arrays.fill(wideLExtent[loc], length + 1); // the leftmost left with state s ending at i that we can get is the end
}
for (int loc = 0; loc < length; loc++) {
Arrays.fill(narrowRExtent[loc], length + 1); // the leftmost right with state s starting at i that we can get is the end
Arrays.fill(wideRExtent[loc], -1); // the rightmost right with state s starting at i that we can get is the beginning
}
initializeChart(lr);
doInsideScores();
bestScore = iScore[0][length][goal];
if (op.testOptions.verbose) {
Timing.tick("done.");
System.err.println("PCFG " + length + " words (incl. stop) iScore " + bestScore);
}
boolean succeeded = hasParse();
// Try a recovery parse
if (!succeeded && op.testOptions.doRecovery && !floodTags) {
floodTags = true;
System.err.printf(this.getClass().getName() + ": Parse failed. Trying recovery parse...");
succeeded = parse(lr);
if(!succeeded) return false;
}
oScore[0][length][goal] = 0.0f;
doOutsideScores();
if (op.testOptions.verbose) {
Timing.tick("done.");
}
if (op.doDep) {
initializePossibles();
}
return succeeded;
}
/** These arrays are used by the factored parser (only) during edge combination.
* The method assumes that the iScore and oScore arrays have been initialized.
*/
protected void initializePossibles() {
for (int loc = 0; loc < length; loc++) {
Arrays.fill(iPossibleByL[loc], false);
Arrays.fill(oPossibleByL[loc], false);
}
for (int loc = 0; loc <= length; loc++) {
Arrays.fill(iPossibleByR[loc], false);
Arrays.fill(oPossibleByR[loc], false);
}
for (int start = 0; start < length; start++) {
for (int end = start + 1; end <= length; end++) {
for (int state = 0; state < numStates; state++) {
if (iScore[start][end][state] > Float.NEGATIVE_INFINITY && oScore[start][end][state] > Float.NEGATIVE_INFINITY) {
iPossibleByL[start][state] = true;
iPossibleByR[end][state] = true;
oPossibleByL[start][state] = true;
oPossibleByR[end][state] = true;
}
}
}
}
}
private void doOutsideScores() {
for (int diff = length; diff >= 1; diff--) {
if (Thread.interrupted()) {
throw new RuntimeInterruptedException();
}
for (int start = 0; start + diff <= length; start++) {
int end = start + diff;
// do unaries
for (int s = 0; s < numStates; s++) {
float oS = oScore[start][end][s];
if (oS == Float.NEGATIVE_INFINITY) {
continue;
}
UnaryRule[] rules = ug.closedRulesByParent(s);
for (UnaryRule ur : rules) {
float pS = ur.score;
float tot = oS + pS;
if (tot > oScore[start][end][ur.child] && iScore[start][end][ur.child] > Float.NEGATIVE_INFINITY) {
oScore[start][end][ur.child] = tot;
}
}
}
// do binaries
for (int s = 0; s < numStates; s++) {
int min1 = narrowRExtent[start][s];
if (end < min1) {
continue;
}
BinaryRule[] rules = bg.splitRulesWithLC(s);
for (BinaryRule br : rules) {
float oS = oScore[start][end][br.parent];
if (oS == Float.NEGATIVE_INFINITY) {
continue;
}
int max1 = narrowLExtent[end][br.rightChild];
if (max1 < min1) {
continue;
}
int min = min1;
int max = max1;
if (max - min > 2) {
int min2 = wideLExtent[end][br.rightChild];
min = (min1 > min2 ? min1 : min2);
if (max1 < min) {
continue;
}
int max2 = wideRExtent[start][br.leftChild];
max = (max1 < max2 ? max1 : max2);
if (max < min) {
continue;
}
}
float pS = br.score;
for (int split = min; split <= max; split++) {
float lS = iScore[start][split][br.leftChild];
if (lS == Float.NEGATIVE_INFINITY) {
continue;
}
float rS = iScore[split][end][br.rightChild];
if (rS == Float.NEGATIVE_INFINITY) {
continue;
}
float totL = pS + rS + oS;
if (totL > oScore[start][split][br.leftChild]) {
oScore[start][split][br.leftChild] = totL;
}
float totR = pS + lS + oS;
if (totR > oScore[split][end][br.rightChild]) {
oScore[split][end][br.rightChild] = totR;
}
}
}
}
for (int s = 0; s < numStates; s++) {
int max1 = narrowLExtent[end][s];
if (max1 < start) {
continue;
}
BinaryRule[] rules = bg.splitRulesWithRC(s);
for (BinaryRule br : rules) {
float oS = oScore[start][end][br.parent];
if (oS == Float.NEGATIVE_INFINITY) {
continue;
}
int min1 = narrowRExtent[start][br.leftChild];
if (max1 < min1) {
continue;
}
int min = min1;
int max = max1;
if (max - min > 2) {
int min2 = wideLExtent[end][br.rightChild];
min = (min1 > min2 ? min1 : min2);
if (max1 < min) {
continue;
}
int max2 = wideRExtent[start][br.leftChild];
max = (max1 < max2 ? max1 : max2);
if (max < min) {
continue;
}
}
float pS = br.score;
for (int split = min; split <= max; split++) {
float lS = iScore[start][split][br.leftChild];
if (lS == Float.NEGATIVE_INFINITY) {
continue;
}
float rS = iScore[split][end][br.rightChild];
if (rS == Float.NEGATIVE_INFINITY) {
continue;
}
float totL = pS + rS + oS;
if (totL > oScore[start][split][br.leftChild]) {
oScore[start][split][br.leftChild] = totL;
}
float totR = pS + lS + oS;
if (totR > oScore[split][end][br.rightChild]) {
oScore[split][end][br.rightChild] = totR;
}
}
}
}
/*
for (int s = 0; s < numStates; s++) {
float oS = oScore[start][end][s];
//if (iScore[start][end][s] == Float.NEGATIVE_INFINITY ||
// oS == Float.NEGATIVE_INFINITY)
if (oS == Float.NEGATIVE_INFINITY)
continue;
BinaryRule[] rules = bg.splitRulesWithParent(s);
for (int r=0; r<rules.length; r++) {
BinaryRule br = rules[r];
int min1 = narrowRExtent[start][br.leftChild];
if (end < min1)
continue;
int max1 = narrowLExtent[end][br.rightChild];
if (max1 < min1)
continue;
int min2 = wideLExtent[end][br.rightChild];
int min = (min1 > min2 ? min1 : min2);
if (max1 < min)
continue;
int max2 = wideRExtent[start][br.leftChild];
int max = (max1 < max2 ? max1 : max2);
if (max < min)
continue;
float pS = (float) br.score;
for (int split = min; split <= max; split++) {
float lS = iScore[start][split][br.leftChild];
if (lS == Float.NEGATIVE_INFINITY)
continue;
float rS = iScore[split][end][br.rightChild];
if (rS == Float.NEGATIVE_INFINITY)
continue;
float totL = pS+rS+oS;
if (totL > oScore[start][split][br.leftChild]) {
oScore[start][split][br.leftChild] = totL;
}
float totR = pS+lS+oS;
if (totR > oScore[split][end][br.rightChild]) {
oScore[split][end][br.rightChild] = totR;
}
}
}
}
*/
}
}
}
/** Fills in the iScore array of each category over each span
* of length 2 or more.
*/
void doInsideScores() {
for (int diff = 2; diff <= length; diff++) {
if (Thread.interrupted()) {
throw new RuntimeInterruptedException();
}
// usually stop one short because boundary symbol only combines
// with whole sentence span. So for 3 word sentence + boundary = 4,
// length == 4, and do [0,2], [1,3]; [0,3]; [0,4]
for (int start = 0; start < ((diff == length) ? 1: length - diff); start++) {
doInsideChartCell(diff, start);
} // for start
} // for diff (i.e., span)
} // end doInsideScores()
private void doInsideChartCell(final int diff, final int start) {
final boolean lengthNormalization = op.testOptions.lengthNormalization;
if (spillGuts) {
tick("Binaries for span " + diff + " start " + start + " ...");
}
int end = start + diff;
final List<ParserConstraint> constraints = getConstraints();
if (constraints != null) {
for (ParserConstraint c : constraints) {
if ((start > c.start && start < c.end && end > c.end) || (end > c.start && end < c.end && start < c.start)) {
return;
}
}
}
// 2011-11-26 jdk1.6: caching/hoisting a bunch of variables gives you about 15% speed up!
// caching this saves a bit of time in the inner loop, maybe 1.8%
int[] narrowRExtent_start = narrowRExtent[start];
// caching this saved 2% in the inner loop
int[] wideRExtent_start = wideRExtent[start];
int[] narrowLExtent_end = narrowLExtent[end];
int[] wideLExtent_end = wideLExtent[end];
float[][] iScore_start = iScore[start];
float[] iScore_start_end = iScore_start[end];
for (int leftState = 0; leftState < numStates; leftState++) {
int narrowR = narrowRExtent_start[leftState];
if (narrowR >= end) { // can this left constituent leave space for a right constituent?
continue;
}
BinaryRule[] leftRules = bg.splitRulesWithLC(leftState);
// if (spillGuts) System.out.println("Found " + leftRules.length + " left rules for state " + stateIndex.get(leftState));
for (BinaryRule rule : leftRules) {
int rightChild = rule.rightChild;
int narrowL = narrowLExtent_end[rightChild];
if (narrowL < narrowR) { // can this right constituent fit next to the left constituent?
continue;
}
int min2 = wideLExtent_end[rightChild];
int min = (narrowR > min2 ? narrowR : min2);
// Erik Frey 2009-12-17: This is unnecessary: narrowR is <= narrowL (established in previous check) and wideLExtent[e][r] is always <= narrowLExtent[e][r] by design, so the check will never evaluate true.
// if (min > narrowL) { // can this right constituent stretch far enough to reach the left constituent?
// continue;
// }
int max1 = wideRExtent_start[leftState];
int max = (max1 < narrowL ? max1 : narrowL);
if (min > max) { // can this left constituent stretch far enough to reach the right constituent?
continue;
}
float pS = rule.score;
int parentState = rule.parent;
float oldIScore = iScore_start_end[parentState];
float bestIScore = oldIScore;
boolean foundBetter; // always set below for this rule
//System.out.println("Min "+min+" max "+max+" start "+start+" end "+end);
if ( ! lengthNormalization) {
// find the split that can use this rule to make the max score
for (int split = min; split <= max; split++) {
if (constraints != null) {
boolean skip = false;
for (ParserConstraint c : constraints) {
if (((start < c.start && end >= c.end) || (start <= c.start && end > c.end)) && split > c.start && split < c.end) {
skip = true;
break;
}
if ((start == c.start && split == c.end)) {
String tag = stateIndex.get(leftState);
Matcher m = c.state.matcher(tag);
if (!m.matches()) {
skip = true;
break;
}
}
if ((split == c.start && end == c.end)) {
String tag = stateIndex.get(rightChild);
Matcher m = c.state.matcher(tag);
if (!m.matches()) {
skip = true;
break;
}
}
}
if (skip) {
continue;
}
}
float lS = iScore_start[split][leftState];
if (lS == Float.NEGATIVE_INFINITY) {
continue;
}
float rS = iScore[split][end][rightChild];
if (rS == Float.NEGATIVE_INFINITY) {
continue;
}
float tot = pS + lS + rS;
if (spillGuts) { System.err.println("Rule " + rule + " over [" + start + "," + end + ") has log score " + tot + " from L[" + stateIndex.get(leftState) + "=" + leftState + "] = "+ lS + " R[" + stateIndex.get(rightChild) + "=" + rightChild + "] = " + rS); }
if (tot > bestIScore) {
bestIScore = tot;
}
} // for split point
foundBetter = bestIScore > oldIScore;
} else {
// find split that uses this rule to make the max *length normalized* score
int bestWordsInSpan = wordsInSpan[start][end][parentState];
float oldNormIScore = oldIScore / bestWordsInSpan;
float bestNormIScore = oldNormIScore;
for (int split = min; split <= max; split++) {
float lS = iScore_start[split][leftState];
if (lS == Float.NEGATIVE_INFINITY) {
continue;
}
float rS = iScore[split][end][rightChild];
if (rS == Float.NEGATIVE_INFINITY) {
continue;
}
float tot = pS + lS + rS;
int newWordsInSpan = wordsInSpan[start][split][leftState] + wordsInSpan[split][end][rightChild];
float normTot = tot / newWordsInSpan;
if (normTot > bestNormIScore) {
bestIScore = tot;
bestNormIScore = normTot;
bestWordsInSpan = newWordsInSpan;
}
} // for split point
foundBetter = bestNormIScore > oldNormIScore;
if (foundBetter) {
wordsInSpan[start][end][parentState] = bestWordsInSpan;
}
} // fi op.testOptions.lengthNormalization
if (foundBetter) { // this way of making "parentState" is better than previous
iScore_start_end[parentState] = bestIScore;
if (spillGuts) System.err.println("Could build " + stateIndex.get(parentState) + " from " + start + " to " + end + " score " + bestIScore);
if (oldIScore == Float.NEGATIVE_INFINITY) {
if (start > narrowLExtent_end[parentState]) {
narrowLExtent_end[parentState] = wideLExtent_end[parentState] = start;
} else if (start < wideLExtent_end[parentState]) {
wideLExtent_end[parentState] = start;
}
if (end < narrowRExtent_start[parentState]) {
narrowRExtent_start[parentState] = wideRExtent_start[parentState] = end;
} else if (end > wideRExtent_start[parentState]) {
wideRExtent_start[parentState] = end;
}
}
} // end if foundBetter
} // end for leftRules
} // end for leftState
// do right restricted rules
for (int rightState = 0; rightState < numStates; rightState++) {
int narrowL = narrowLExtent_end[rightState];
if (narrowL <= start) {
continue;
}
BinaryRule[] rightRules = bg.splitRulesWithRC(rightState);
// if (spillGuts) System.out.println("Found " + rightRules.length + " right rules for state " + stateIndex.get(rightState));
for (BinaryRule rule : rightRules) {
// if (spillGuts) System.out.println("Considering rule for " + start + " to " + end + ": " + rightRules[i]);
int leftChild = rule.leftChild;
int narrowR = narrowRExtent_start[leftChild];
if (narrowR > narrowL) {
continue;
}
int min2 = wideLExtent_end[rightState];
int min = (narrowR > min2 ? narrowR : min2);
// Erik Frey 2009-12-17: This is unnecessary: narrowR is <= narrowL (established in previous check) and wideLExtent[e][r] is always <= narrowLExtent[e][r] by design, so the check will never evaluate true.
// if (min > narrowL) {
// continue;
// }
int max1 = wideRExtent_start[leftChild];
int max = (max1 < narrowL ? max1 : narrowL);
if (min > max) {
continue;
}
float pS = rule.score;
int parentState = rule.parent;
float oldIScore = iScore_start_end[parentState];
float bestIScore = oldIScore;
boolean foundBetter; // always initialized below
//System.out.println("Start "+start+" end "+end+" min "+min+" max "+max);
if ( ! lengthNormalization) {
// find the split that can use this rule to make the max score
for (int split = min; split <= max; split++) {
if (constraints != null) {
boolean skip = false;
for (ParserConstraint c : constraints) {
if (((start < c.start && end >= c.end) || (start <= c.start && end > c.end)) && split > c.start && split < c.end) {
skip = true;
break;
}
if ((start == c.start && split == c.end)) {
String tag = stateIndex.get(leftChild);
Matcher m = c.state.matcher(tag);
if (!m.matches()) {
//if (!tag.startsWith(c.state+"^")) {
skip = true;
break;
}
}
if ((split == c.start && end == c.end)) {
String tag = stateIndex.get(rightState);
Matcher m = c.state.matcher(tag);
if (!m.matches()) {
//if (!tag.startsWith(c.state+"^")) {
skip = true;
break;
}
}
}
if (skip) {
continue;
}
}
float lS = iScore_start[split][leftChild];
// cdm [2012]: Test whether removing these 2 tests might speed things up because less branching?
// jab [2014]: oddly enough, removing these tests helps the chinese parser but not the english parser.
if (lS == Float.NEGATIVE_INFINITY) {
continue;
}
float rS = iScore[split][end][rightState];
if (rS == Float.NEGATIVE_INFINITY) {
continue;
}
float tot = pS + lS + rS;
if (tot > bestIScore) {
bestIScore = tot;
}
} // end for split
foundBetter = bestIScore > oldIScore;
} else {
// find split that uses this rule to make the max *length normalized* score
int bestWordsInSpan = wordsInSpan[start][end][parentState];
float oldNormIScore = oldIScore / bestWordsInSpan;
float bestNormIScore = oldNormIScore;
for (int split = min; split <= max; split++) {
float lS = iScore_start[split][leftChild];
if (lS == Float.NEGATIVE_INFINITY) {
continue;
}
float rS = iScore[split][end][rightState];
if (rS == Float.NEGATIVE_INFINITY) {
continue;
}
float tot = pS + lS + rS;
int newWordsInSpan = wordsInSpan[start][split][leftChild] + wordsInSpan[split][end][rightState];
float normTot = tot / newWordsInSpan;
if (normTot > bestNormIScore) {
bestIScore = tot;
bestNormIScore = normTot;
bestWordsInSpan = newWordsInSpan;
}
} // end for split
foundBetter = bestNormIScore > oldNormIScore;
if (foundBetter) {
wordsInSpan[start][end][parentState] = bestWordsInSpan;
}
} // end if lengthNormalization
if (foundBetter) { // this way of making "parentState" is better than previous
iScore_start_end[parentState] = bestIScore;
if (spillGuts) System.err.println("Could build " + stateIndex.get(parentState) + " from " + start + " to " + end + " with score " + bestIScore);
if (oldIScore == Float.NEGATIVE_INFINITY) {
if (start > narrowLExtent_end[parentState]) {
narrowLExtent_end[parentState] = wideLExtent_end[parentState] = start;
} else if (start < wideLExtent_end[parentState]) {
wideLExtent_end[parentState] = start;
}
if (end < narrowRExtent_start[parentState]) {
narrowRExtent_start[parentState] = wideRExtent_start[parentState] = end;
} else if (end > wideRExtent_start[parentState]) {
wideRExtent_start[parentState] = end;
}
}
} // end if foundBetter
} // for rightRules
} // for rightState
if (spillGuts) {
tick("Unaries for span " + diff + "...");
}
// do unary rules -- one could promote this loop and put start inside
for (int state = 0; state < numStates; state++) {
float iS = iScore_start_end[state];
if (iS == Float.NEGATIVE_INFINITY) {
continue;
}
UnaryRule[] unaries = ug.closedRulesByChild(state);
for (UnaryRule ur : unaries) {
if (constraints != null) {
boolean skip = false;
for (ParserConstraint c : constraints) {
if ((start == c.start && end == c.end)) {
String tag = stateIndex.get(ur.parent);
Matcher m = c.state.matcher(tag);
if (!m.matches()) {
//if (!tag.startsWith(c.state+"^")) {
skip = true;
break;
}
}
}
if (skip) {
continue;
}
}
int parentState = ur.parent;
float pS = ur.score;
float tot = iS + pS;
float cur = iScore_start_end[parentState];
boolean foundBetter; // always set below
if (lengthNormalization) {
int totWordsInSpan = wordsInSpan[start][end][state];
float normTot = tot / totWordsInSpan;
int curWordsInSpan = wordsInSpan[start][end][parentState];
float normCur = cur / curWordsInSpan;
foundBetter = normTot > normCur;
if (foundBetter) {
wordsInSpan[start][end][parentState] = wordsInSpan[start][end][state];
}
} else {
foundBetter = (tot > cur);
}
if (foundBetter) {
if (spillGuts) System.err.println("Could build " + stateIndex.get(parentState) + " from " + start + " to " + end + " with score " + tot);
iScore_start_end[parentState] = tot;
if (cur == Float.NEGATIVE_INFINITY) {
if (start > narrowLExtent_end[parentState]) {
narrowLExtent_end[parentState] = wideLExtent_end[parentState] = start;
} else if (start < wideLExtent_end[parentState]) {
wideLExtent_end[parentState] = start;
}
if (end < narrowRExtent_start[parentState]) {
narrowRExtent_start[parentState] = wideRExtent_start[parentState] = end;
} else if (end > wideRExtent_start[parentState]) {
wideRExtent_start[parentState] = end;
}
}
} // end if foundBetter
} // for UnaryRule r
} // for unary rules
}
private void initializeChart(Lattice lr) {
for (LatticeEdge edge : lr) {
int start = edge.start;
int end = edge.end;
String word = edge.word;
// Add pre-terminals, augmented with edge weights
for (int state = 0; state < numStates; state++) {
if (isTag[state]) {
IntTaggedWord itw = new IntTaggedWord(word, stateIndex.get(state), wordIndex, tagIndex);
float newScore = lex.score(itw, start, word, null) + (float) edge.weight;
if (newScore > iScore[start][end][state]) {
iScore[start][end][state] = newScore;
narrowRExtent[start][state] = Math.min(end, narrowRExtent[start][state]);
narrowLExtent[end][state] = Math.max(start, narrowLExtent[end][state]);
wideRExtent[start][state] = Math.max(end, wideRExtent[start][state]);
wideLExtent[end][state] = Math.min(start, wideLExtent[end][state]);
}
}
}
// Give scores to all tags if the parse fails (more flexible tagging)
if (floodTags && (!op.testOptions.noRecoveryTagging)) {
for (int state = 0; state < numStates; state++) {
float iS = iScore[start][end][state];
if (isTag[state] && iS == Float.NEGATIVE_INFINITY) {
iScore[start][end][state] = -1000.0f + (float) edge.weight;
narrowRExtent[start][state] = end;
narrowLExtent[end][state] = start;
wideRExtent[start][state] = end;
wideLExtent[end][state] = start;
}
}
}
// Add unary rules (possibly chains) that terminate in POS tags
for (int state = 0; state < numStates; state++) {
float iS = iScore[start][end][state];
if (iS == Float.NEGATIVE_INFINITY) {
continue;
}
UnaryRule[] unaries = ug.closedRulesByChild(state);
for (UnaryRule ur : unaries) {
int parentState = ur.parent;
float pS = ur.score;
float tot = iS + pS;
if (tot > iScore[start][end][parentState]) {
iScore[start][end][parentState] = tot;
narrowRExtent[start][parentState] = Math.min(end, narrowRExtent[start][parentState]);
narrowLExtent[end][parentState] = Math.max(start, narrowLExtent[end][parentState]);
wideRExtent[start][parentState] = Math.max(end, wideRExtent[start][parentState]);
wideLExtent[end][parentState] = Math.min(start, wideLExtent[end][parentState]);
// narrowRExtent[start][parentState] = start + 1; //end
// narrowLExtent[end][parentState] = end - 1; //start
// wideRExtent[start][parentState] = start + 1; //end
// wideLExtent[end][parentState] = end - 1; //start
}
}
}
}
}
private void initializeChart(List<? extends HasWord> sentence) {
int boundary = wordIndex.indexOf(Lexicon.BOUNDARY);
for (int start = 0; start < length; start++) {
if (op.testOptions.maxSpanForTags > 1) { // only relevant for parsing single words as multiple input tokens.
// todo [cdm 2012]: This case seems buggy in never doing unaries over span 1 items
// note we don't look for "words" including the end symbol!
for (int end = start + 1; (end < length - 1 && end - start <= op.testOptions.maxSpanForTags) || (start + 1 == end); end++) {
StringBuilder word = new StringBuilder();
//wsg: Feb 2010 - Appears to support character-level parsing
for (int i = start; i < end; i++) {
if (sentence.get(i) instanceof HasWord) {
HasWord cl = sentence.get(i);
word.append(cl.word());
} else {
word.append(sentence.get(i).toString());
}
}
for (int state = 0; state < numStates; state++) {
float iS = iScore[start][end][state];
if (iS == Float.NEGATIVE_INFINITY && isTag[state]) {
IntTaggedWord itw = new IntTaggedWord(word.toString(), stateIndex.get(state), wordIndex, tagIndex);
iScore[start][end][state] = lex.score(itw, start, word.toString(), null);
if (iScore[start][end][state] > Float.NEGATIVE_INFINITY) {
narrowRExtent[start][state] = start + 1;
narrowLExtent[end][state] = end - 1;
wideRExtent[start][state] = start + 1;
wideLExtent[end][state] = end - 1;
}
}
}
}
} else { // "normal" chart initialization of the [start,start+1] cell
int word = words[start];
int end = start + 1;
Arrays.fill(tags[start], false);
float[] iScore_start_end = iScore[start][end];
int[] narrowRExtent_start = narrowRExtent[start];
int[] narrowLExtent_end = narrowLExtent[end];
int[] wideRExtent_start = wideRExtent[start];
int[] wideLExtent_end = wideLExtent[end];
//Force tags
String trueTagStr = null;
if (sentence.get(start) instanceof HasTag) {
trueTagStr = ((HasTag) sentence.get(start)).tag();
if ("".equals(trueTagStr)) {
trueTagStr = null;
}
}
// Another option for forcing tags: supply a regex
String candidateTagRegex = null;
if (sentence.get(start) instanceof CoreLabel) {
candidateTagRegex = ((CoreLabel) sentence.get(start)).get(ParserAnnotations.CandidatePartOfSpeechAnnotation.class);
if ("".equals(candidateTagRegex)) {
candidateTagRegex = null;
}
}
//Word context (e.g., morphosyntactic info)
String wordContextStr = null;
if(sentence.get(start) instanceof HasContext) {
wordContextStr = ((HasContext) sentence.get(start)).originalText();
if("".equals(wordContextStr))
wordContextStr = null;
}
boolean assignedSomeTag = false;
if ( ! floodTags || word == boundary) {
// in this case we generate the taggings in the lexicon,
// which may itself be tagging flexibly or using a strict lexicon.
if (dumpTagging) {
EncodingPrintWriter.err.println("Normal tagging " + wordIndex.get(word) + " [" + word + "]", "UTF-8");
}
for (Iterator<IntTaggedWord> taggingI = lex.ruleIteratorByWord(word, start, wordContextStr); taggingI.hasNext(); ) {
IntTaggedWord tagging = taggingI.next();
int state = stateIndex.indexOf(tagIndex.get(tagging.tag));
// if word was supplied with a POS tag, skip all taggings
// not basicCategory() compatible with supplied tag.
if (trueTagStr != null) {
if ((!op.testOptions.forceTagBeginnings && !tlp.basicCategory(tagging.tagString(tagIndex)).equals(trueTagStr)) ||
(op.testOptions.forceTagBeginnings && !tagging.tagString(tagIndex).startsWith(trueTagStr))) {
if (dumpTagging) {
EncodingPrintWriter.err.println(" Skipping " + tagging + " as it doesn't match trueTagStr: " + trueTagStr, "UTF-8");
}
continue;
}
}
if (candidateTagRegex != null) {
if ((!op.testOptions.forceTagBeginnings && !tlp.basicCategory(tagging.tagString(tagIndex)).matches(candidateTagRegex)) ||
(op.testOptions.forceTagBeginnings && !tagging.tagString(tagIndex).matches(candidateTagRegex))) {
if (dumpTagging) {
EncodingPrintWriter.err.println(" Skipping " + tagging + " as it doesn't match candidateTagRegex: " + candidateTagRegex, "UTF-8");
}
continue;
}
}
// try {
float lexScore = lex.score(tagging, start, wordIndex.get(tagging.word), wordContextStr); // score the cell according to P(word|tag) in the lexicon
if (lexScore > Float.NEGATIVE_INFINITY) {
assignedSomeTag = true;
iScore_start_end[state] = lexScore;
narrowRExtent_start[state] = end;
narrowLExtent_end[state] = start;
wideRExtent_start[state] = end;
wideLExtent_end[state] = start;
}
// } catch (Exception e) {
// e.printStackTrace();
// System.out.println("State: " + state + " tags " + Numberer.getGlobalNumberer("tags").object(tagging.tag));
// }
int tag = tagging.tag;
tags[start][tag] = true;
if (dumpTagging) {
EncodingPrintWriter.err.println("Word pos " + start + " tagging " + tagging + " score " + iScore_start_end[state] + " [state " + stateIndex.get(state) + " = " + state + "]", "UTF-8");
}
//if (start == length-2 && tagging.parent == puncTag)
// lastIsPunc = true;
}
} // end if ( ! floodTags || word == boundary)
if ( ! assignedSomeTag) {
// If you got here, either you were using forceTags (gold tags)
// and the gold tag was not seen with that word in the training data
// or we are in floodTags=true (recovery parse) mode
// Here, we give words all tags for
// which the lexicon score is not -Inf, not just seen or
// specified taggings
if (dumpTagging) {
EncodingPrintWriter.err.println("Forced FlexiTagging " + wordIndex.get(word), "UTF-8");
}
for (int state = 0; state < numStates; state++) {
if (isTag[state] && iScore_start_end[state] == Float.NEGATIVE_INFINITY) {
if (trueTagStr != null) {
String tagString = stateIndex.get(state);
if ( ! tlp.basicCategory(tagString).equals(trueTagStr)) {
continue;
}
}
float lexScore = lex.score(new IntTaggedWord(word, tagIndex.indexOf(stateIndex.get(state))), start, wordIndex.get(word), wordContextStr);
if (candidateTagRegex != null) {
String tagString = stateIndex.get(state);
if (!tlp.basicCategory(tagString).matches(candidateTagRegex)) {
continue;
}
}
if (lexScore > Float.NEGATIVE_INFINITY) {
iScore_start_end[state] = lexScore;
narrowRExtent_start[state] = end;
narrowLExtent_end[state] = start;
wideRExtent_start[state] = end;
wideLExtent_end[state] = start;
}
if (dumpTagging) {
EncodingPrintWriter.err.println("Word pos " + start + " tagging " + (new IntTaggedWord(word, tagIndex.indexOf(stateIndex.get(state)))) + " score " + iScore_start_end[state] + " [state " + stateIndex.get(state) + " = " + state + "]", "UTF-8");
}
}
}
} // end if ! assignedSomeTag
// tag multi-counting
if (op.dcTags) {
for (int state = 0; state < numStates; state++) {
if (isTag[state]) {
iScore_start_end[state] *= (1.0 + op.testOptions.depWeight);
}
}
}
if (floodTags && (!op.testOptions.noRecoveryTagging) && ! (word == boundary)) {
// if parse failed because of tag coverage, we put in all tags with
// a score of -1000, by fiat. You get here from the invocation of
// parse(ls) inside parse(ls) *after* floodTags has been turned on.
// Search above for "floodTags = true".
if (dumpTagging) {
EncodingPrintWriter.err.println("Flooding tags for " + wordIndex.get(word), "UTF-8");
}
for (int state = 0; state < numStates; state++) {
if (isTag[state] && iScore_start_end[state] == Float.NEGATIVE_INFINITY) {
iScore_start_end[state] = -1000.0f;
narrowRExtent_start[state] = end;
narrowLExtent_end[state] = start;
wideRExtent_start[state] = end;
wideLExtent_end[state] = start;
}
}
}
// Apply unary rules in diagonal cells of chart
if (spillGuts) {
tick("Terminal Unary...");
}
for (int state = 0; state < numStates; state++) {
float iS = iScore_start_end[state];
if (iS == Float.NEGATIVE_INFINITY) {
continue;
}
UnaryRule[] unaries = ug.closedRulesByChild(state);
for (UnaryRule ur : unaries) {
int parentState = ur.parent;
float pS = ur.score;
float tot = iS + pS;
if (tot > iScore_start_end[parentState]) {
iScore_start_end[parentState] = tot;
narrowRExtent_start[parentState] = end;
narrowLExtent_end[parentState] = start;
wideRExtent_start[parentState] = end;
wideLExtent_end[parentState] = start;
}
}
}
if (spillGuts) {
tick("Next word...");
}
}
} // end for start
} // end initializeChart(List sentence)
@Override
public boolean hasParse() {
return getBestScore() > Double.NEGATIVE_INFINITY;
}
private static final double TOL = 1e-5;
protected static boolean matches(double x, double y) {
return (Math.abs(x - y) / (Math.abs(x) + Math.abs(y) + 1e-10) < TOL);
}
@Override
public double getBestScore() {
return getBestScore(goalStr);
}
public double getBestScore(String stateName) {
if (length > arraySize) {
return Double.NEGATIVE_INFINITY;
}
if (!stateIndex.contains(stateName)) {
return Double.NEGATIVE_INFINITY;
}
int goal = stateIndex.indexOf(stateName);
if (iScore == null || iScore.length == 0 || iScore[0].length <= length || iScore[0][length].length <= goal) {
return Double.NEGATIVE_INFINITY;
}
return iScore[0][length][goal];
}
@Override
public Tree getBestParse() {
Tree internalTree = extractBestParse(goalStr, 0, length);
//System.out.println("Got internal best parse...");
if (internalTree == null) {
System.err.println("Warning: no parse found in ExhaustivePCFGParser.extractBestParse");
} // else {
// restoreUnaries(internalTree);
// }
// System.out.println("Restored unaries...");
return internalTree;
//TreeTransformer debinarizer = BinarizerFactory.getDebinarizer();
//return debinarizer.transformTree(internalTree);
}
/** Return the best parse of some category/state over a certain span. */
protected Tree extractBestParse(String goalStr, int start, int end) {
return extractBestParse(stateIndex.indexOf(goalStr), start, end);
}
private Tree extractBestParse(int goal, int start, int end) {
// find source of inside score
// no backtraces so we can speed up the parsing for its primary use
double bestScore = iScore[start][end][goal];
double normBestScore = op.testOptions.lengthNormalization ? (bestScore / wordsInSpan[start][end][goal]) : bestScore;
String goalStr = stateIndex.get(goal);
// check tags
if (end - start <= op.testOptions.maxSpanForTags && tagIndex.contains(goalStr)) {
if (op.testOptions.maxSpanForTags > 1) {
Tree wordNode = null;
if (sentence != null) {
StringBuilder word = new StringBuilder();
for (int i = start; i < end; i++) {
if (sentence.get(i) instanceof HasWord) {
HasWord cl = (HasWord) sentence.get(i);
word.append(cl.word());
} else {
word.append(sentence.get(i).toString());
}
}
wordNode = tf.newLeaf(word.toString());
} else if (lr != null) {
List<LatticeEdge> latticeEdges = lr.getEdgesOverSpan(start, end);
for (LatticeEdge edge : latticeEdges) {
IntTaggedWord itw = new IntTaggedWord(edge.word, stateIndex.get(goal), wordIndex, tagIndex);
float tagScore = (floodTags) ? -1000.0f : lex.score(itw, start, edge.word, null);
if (matches(bestScore, tagScore + (float) edge.weight)) {
wordNode = tf.newLeaf(edge.word);
if(wordNode.label() instanceof CoreLabel) {
CoreLabel cl = (CoreLabel) wordNode.label();
cl.setBeginPosition(start);
cl.setEndPosition(end);
}
break;
}
}
if (wordNode == null) {
throw new RuntimeException("could not find matching word from lattice in parse reconstruction");
}
} else {
throw new RuntimeException("attempt to get word when sentence and lattice are null!");
}
Tree tagNode = tf.newTreeNode(goalStr, Collections.singletonList(wordNode));
tagNode.setScore(bestScore);
if (originalTags[start] != null) {
tagNode.label().setValue(originalTags[start].tag());
}
return tagNode;
} else { // normal lexicon is single words case
IntTaggedWord tagging = new IntTaggedWord(words[start], tagIndex.indexOf(goalStr));
String contextStr = getCoreLabel(start).originalText();
float tagScore = lex.score(tagging, start, wordIndex.get(words[start]), contextStr);
if (tagScore > Float.NEGATIVE_INFINITY || floodTags) {
// return a pre-terminal tree
CoreLabel terminalLabel = getCoreLabel(start);
Tree wordNode = tf.newLeaf(terminalLabel);
Tree tagNode = tf.newTreeNode(goalStr, Collections.singletonList(wordNode));
tagNode.setScore(bestScore);
if (terminalLabel.tag() != null) {
tagNode.label().setValue(terminalLabel.tag());
}
if (tagNode.label() instanceof HasTag) {
((HasTag) tagNode.label()).setTag(tagNode.label().value());
}
return tagNode;
}
}
}
// check binaries first
for (int split = start + 1; split < end; split++) {
for (Iterator<BinaryRule> binaryI = bg.ruleIteratorByParent(goal); binaryI.hasNext(); ) {
BinaryRule br = binaryI.next();
double score = br.score + iScore[start][split][br.leftChild] + iScore[split][end][br.rightChild];
boolean matches;
if (op.testOptions.lengthNormalization) {
double normScore = score / (wordsInSpan[start][split][br.leftChild] + wordsInSpan[split][end][br.rightChild]);
matches = matches(normScore, normBestScore);
} else {
matches = matches(score, bestScore);
}
if (matches) {
// build binary split
Tree leftChildTree = extractBestParse(br.leftChild, start, split);
Tree rightChildTree = extractBestParse(br.rightChild, split, end);
List<Tree> children = new ArrayList<Tree>();
children.add(leftChildTree);
children.add(rightChildTree);
Tree result = tf.newTreeNode(goalStr, children);
result.setScore(score);
// System.err.println(" Found Binary node: "+result);
return result;
}
}
}
// check unaries
// note that even though we parse with the unary-closed grammar, we can
// extract the best parse with the non-unary-closed grammar, since all
// the intermediate states in the chain must have been built, and hence
// we can exploit the sparser space and reconstruct the full tree as we go.
// for (Iterator<UnaryRule> unaryI = ug.closedRuleIteratorByParent(goal); unaryI.hasNext(); ) {
for (Iterator<UnaryRule> unaryI = ug.ruleIteratorByParent(goal); unaryI.hasNext(); ) {
UnaryRule ur = unaryI.next();
// System.err.println(" Trying " + ur + " dtr score: " + iScore[start][end][ur.child]);
double score = ur.score + iScore[start][end][ur.child];
boolean matches;
if (op.testOptions.lengthNormalization) {
double normScore = score / wordsInSpan[start][end][ur.child];
matches = matches(normScore, normBestScore);
} else {
matches = matches(score, bestScore);
}
if (ur.child != ur.parent && matches) {
// build unary
Tree childTree = extractBestParse(ur.child, start, end);
Tree result = tf.newTreeNode(goalStr, Collections.singletonList(childTree));
// System.err.println(" Matched! Unary node: "+result);
result.setScore(score);
return result;
}
}
System.err.println("Warning: no parse found in ExhaustivePCFGParser.extractBestParse: failing on: [" + start + ", " + end + "] looking for " + goalStr);
return null;
}
/* -----------------------
// No longer needed: extracBestParse restores unaries as it goes
protected void restoreUnaries(Tree t) {
//System.out.println("In restoreUnaries...");
for (Tree node : t) {
System.err.println("Doing node: "+node.label());
if (node.isLeaf() || node.isPreTerminal() || node.numChildren() != 1) {
//System.out.println("Skipping node: "+node.label());
continue;
}
//System.out.println("Not skipping node: "+node.label());
Tree parent = node;
Tree child = node.children()[0];
List path = ug.getBestPath(stateIndex.indexOf(parent.label().value()), stateIndex.indexOf(child.label().value()));
System.err.println("Got path: "+path);
int pos = 1;
while (pos < path.size() - 1) {
int interState = ((Integer) path.get(pos)).intValue();
Tree intermediate = tf.newTreeNode(new StringLabel(stateIndex.get(interState)), parent.getChildrenAsList());
parent.setChildren(Collections.singletonList(intermediate));
pos++;
}
//System.out.println("Done with node: "+node.label());
}
}
---------------------- */
/**
* Return all best parses (except no ties allowed on POS tags?).
* Even though we parse with the unary-closed grammar, since all the
* intermediate states in a chain must have been built, we can
* reconstruct the unary chain as we go using the non-unary-closed grammar.
*/
protected List<Tree> extractBestParses(int goal, int start, int end) {
// find sources of inside score
// no backtraces so we can speed up the parsing for its primary use
double bestScore = iScore[start][end][goal];
String goalStr = stateIndex.get(goal);
//System.out.println("Searching for "+goalStr+" from "+start+" to "+end+" scored "+bestScore);
// check tags
if (end - start == 1 && tagIndex.contains(goalStr)) {
IntTaggedWord tagging = new IntTaggedWord(words[start], tagIndex.indexOf(goalStr));
String contextStr = getCoreLabel(start).originalText();
float tagScore = lex.score(tagging, start, wordIndex.get(words[start]), contextStr);
if (tagScore > Float.NEGATIVE_INFINITY || floodTags) {
// return a pre-terminal tree
String wordStr = wordIndex.get(words[start]);
Tree wordNode = tf.newLeaf(wordStr);
Tree tagNode = tf.newTreeNode(goalStr, Collections.singletonList(wordNode));
if (originalTags[start] != null) {
tagNode.label().setValue(originalTags[start].tag());
}
//System.out.println("Tag node: "+tagNode);
return Collections.singletonList(tagNode);
}
}
// check binaries first
List<Tree> bestTrees = new ArrayList<Tree>();
for (int split = start + 1; split < end; split++) {
for (Iterator<BinaryRule> binaryI = bg.ruleIteratorByParent(goal); binaryI.hasNext(); ) {
BinaryRule br = binaryI.next();
double score = br.score + iScore[start][split][br.leftChild] + iScore[split][end][br.rightChild];
if (matches(score, bestScore)) {
// build binary split
List<Tree> leftChildTrees = extractBestParses(br.leftChild, start, split);
List<Tree> rightChildTrees = extractBestParses(br.rightChild, split, end);
// System.out.println("Found a best way to build " + goalStr + "(" +
// start + "," + end + ") with " +
// leftChildTrees.size() + "x" +
// rightChildTrees.size() + " ways to build.");
for (Tree leftChildTree : leftChildTrees) {
for (Tree rightChildTree : rightChildTrees) {
List<Tree> children = new ArrayList<Tree>();
children.add(leftChildTree);
children.add(rightChildTree);
Tree result = tf.newTreeNode(goalStr, children);
//System.out.println("Binary node: "+result);
bestTrees.add(result);
}
}
}
}
}
// check unaries
for (Iterator<UnaryRule> unaryI = ug.ruleIteratorByParent(goal); unaryI.hasNext(); ) {
UnaryRule ur = unaryI.next();
double score = ur.score + iScore[start][end][ur.child];
if (ur.child != ur.parent && matches(score, bestScore)) {
// build unary
List<Tree> childTrees = extractBestParses(ur.child, start, end);
for (Tree childTree : childTrees) {
Tree result = tf.newTreeNode(goalStr, Collections.singletonList(childTree));
//System.out.println("Unary node: "+result);
bestTrees.add(result);
}
}
}
if (bestTrees.isEmpty()) {
System.err.println("Warning: no parse found in ExhaustivePCFGParser.extractBestParse: failing on: [" + start + ", " + end + "] looking for " + goalStr);
}
return bestTrees;
}
/** Get k good parses for the sentence. It is expected that the
* parses returned approximate the k best parses, but without any
* guarantee that the exact list of k best parses has been produced.
*
* @param k The number of good parses to return
* @return A list of k good parses for the sentence, with
* each accompanied by its score
*/
@Override
public List<ScoredObject<Tree>> getKGoodParses(int k) {
return getKBestParses(k);
}
/** 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
*/
@Override
public List<ScoredObject<Tree>> getKSampledParses(int k) {
throw new UnsupportedOperationException("ExhaustivePCFGParser doesn't sample.");
}
//
// BEGIN K-BEST STUFF
// taken straight out of "Better k-best Parsing" by Liang Huang and David
// Chiang
//
/** 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).
*/
@Override
public List<ScoredObject<Tree>> getKBestParses(int k) {
cand = Generics.newHashMap();
dHat = Generics.newHashMap();
int start = 0;
int end = length;
int goal = stateIndex.indexOf(goalStr);
Vertex v = new Vertex(goal, start, end);
List<ScoredObject<Tree>> kBestTrees = new ArrayList<ScoredObject<Tree>>();
for (int i = 1; i <= k; i++) {
Tree internalTree = getTree(v, i, k);
if (internalTree == null) { break; }
// restoreUnaries(internalTree);
kBestTrees.add(new ScoredObject<Tree>(internalTree, dHat.get(v).get(i-1).score));
}
return kBestTrees;
}
/** Get the kth best, when calculating kPrime best (e.g. 2nd best of 5). */
private Tree getTree(Vertex v, int k, int kPrime) {
lazyKthBest(v, k, kPrime);
String goalStr = stateIndex.get(v.goal);
int start = v.start;
// int end = v.end;
List<Derivation> dHatV = dHat.get(v);
if (isTag[v.goal] && v.start + 1 == v.end) {
IntTaggedWord tagging = new IntTaggedWord(words[start], tagIndex.indexOf(goalStr));
String contextStr = getCoreLabel(start).originalText();
float tagScore = lex.score(tagging, start, wordIndex.get(words[start]), contextStr);
if (tagScore > Float.NEGATIVE_INFINITY || floodTags) {
// return a pre-terminal tree
CoreLabel terminalLabel = getCoreLabel(start);
Tree wordNode = tf.newLeaf(terminalLabel);
Tree tagNode = tf.newTreeNode(goalStr, Collections.singletonList(wordNode));
if (originalTags[start] != null) {
tagNode.label().setValue(originalTags[start].tag());
}
if (tagNode.label() instanceof HasTag) {
((HasTag) tagNode.label()).setTag(tagNode.label().value());
}
return tagNode;
} else {
assert false;
}
}
if (k-1 >= dHatV.size()) {
return null;
}
Derivation d = dHatV.get(k-1);
List<Tree> children = new ArrayList<Tree>();
for (int i = 0; i < d.arc.size(); i++) {
Vertex child = d.arc.tails.get(i);
Tree t = getTree(child, d.j.get(i), kPrime);
assert (t != null);
children.add(t);
}
return tf.newTreeNode(goalStr,children);
}
private static class Vertex {
public final int goal;
public final int start;
public final int end;
public Vertex(int goal, int start, int end) {
this.goal = goal;
this.start = start;
this.end = end;
}
public boolean equals(Object o) {
if (!(o instanceof Vertex)) { return false; }
Vertex v = (Vertex)o;
return (v.goal == goal && v.start == start && v.end == end);
}
private int hc = -1;
public int hashCode() {
if (hc == -1) {
hc = goal + (17 * (start + (17 * end)));
}
return hc;
}
public String toString() {
return goal+"["+start+","+end+"]";
}
}
private static class Arc {
public final List<Vertex> tails;
public final Vertex head;
public final double ruleScore; // for convenience
public Arc(List<Vertex> tails, Vertex head, double ruleScore) {
this.tails = Collections.unmodifiableList(tails);
this.head = head;
this.ruleScore = ruleScore;
// TODO: add check that rule is compatible with head and tails!
}
public boolean equals(Object o) {
if (!(o instanceof Arc)) { return false; }
Arc a = (Arc) o;
return a.head.equals(head) && a.tails.equals(tails);
}
private int hc = -1;
public int hashCode() {
if (hc == -1) {
hc = head.hashCode() + (17 * tails.hashCode());
}
return hc;
}
public int size() { return tails.size(); }
}
private static class Derivation {
public final Arc arc;
public final List<Integer> j;
public final double score; // score does not affect equality (?)
public final List<Double> childrenScores;
public Derivation(Arc arc, List<Integer> j, double score, List<Double> childrenScores) {
this.arc = arc;
this.j = Collections.unmodifiableList(j);
this.score = score;
this.childrenScores = Collections.unmodifiableList(childrenScores);
}
public boolean equals(Object o) {
if (!(o instanceof Derivation)) { return false; }
Derivation d = (Derivation)o;
if (arc == null && d.arc != null || arc != null && d.arc == null) { return false; }
return ((arc == null && d.arc == null || d.arc.equals(arc)) && d.j.equals(j));
}
private int hc = -1;
public int hashCode() {
if (hc == -1) {
hc = (arc == null ? 0 : arc.hashCode()) + (17 * j.hashCode());
}
return hc;
}
}
private List<Arc> getBackwardsStar(Vertex v) {
List<Arc> bs = new ArrayList<Arc>();
// pre-terminal??
if (isTag[v.goal] && v.start + 1 == v.end) {
List<Vertex> tails = new ArrayList<Vertex>();
double score = iScore[v.start][v.end][v.goal];
Arc arc = new Arc(tails, v, score);
bs.add(arc);
}
// check binaries
for (int split = v.start + 1; split < v.end; split++) {
for (BinaryRule br : bg.ruleListByParent(v.goal)) {
Vertex lChild = new Vertex(br.leftChild, v.start, split);
Vertex rChild = new Vertex(br.rightChild, split, v.end);
List<Vertex> tails = new ArrayList<Vertex>();
tails.add(lChild);
tails.add(rChild);
Arc arc = new Arc(tails, v, br.score);
bs.add(arc);
}
}
// check unaries
for (UnaryRule ur : ug.rulesByParent(v.goal)) {
Vertex child = new Vertex(ur.child, v.start, v.end);
List<Vertex> tails = new ArrayList<Vertex>();
tails.add(child);
Arc arc = new Arc(tails, v, ur.score);
bs.add(arc);
}
return bs;
}
private Map<Vertex,PriorityQueue<Derivation>> cand = Generics.newHashMap();
private Map<Vertex,LinkedList<Derivation>> dHat = Generics.newHashMap();
private PriorityQueue<Derivation> getCandidates(Vertex v, int k) {
PriorityQueue<Derivation> candV = cand.get(v);
if (candV == null) {
candV = new BinaryHeapPriorityQueue<Derivation>();
List<Arc> bsV = getBackwardsStar(v);
for (Arc arc : bsV) {
int size = arc.size();
double score = arc.ruleScore;
List<Double> childrenScores = new ArrayList<Double>();
for (int i = 0; i < size; i++) {
Vertex child = arc.tails.get(i);
double s = iScore[child.start][child.end][child.goal];
childrenScores.add(s);
score += s;
}
if (score == Double.NEGATIVE_INFINITY) { continue; }
List<Integer> j = new ArrayList<Integer>();
for (int i = 0; i < size; i++) {
j.add(1);
}
Derivation d = new Derivation(arc, j, score, childrenScores);
candV.add(d, score);
}
PriorityQueue<Derivation> tmp = new BinaryHeapPriorityQueue<Derivation>();
for (int i = 0; i < k; i++) {
if (candV.isEmpty()) { break; }
Derivation d = candV.removeFirst();
tmp.add(d, d.score);
}
candV = tmp;
cand.put(v, candV);
}
return candV;
}
// note: kPrime is the original k
private void lazyKthBest(Vertex v, int k, int kPrime) {
PriorityQueue<Derivation> candV = getCandidates(v, kPrime);
LinkedList<Derivation> dHatV = dHat.get(v);
if (dHatV == null) {
dHatV = new LinkedList<Derivation>();
dHat.put(v,dHatV);
}
while (dHatV.size() < k) {
if (!dHatV.isEmpty()) {
Derivation derivation = dHatV.getLast();
lazyNext(candV, derivation, kPrime);
}
if (!candV.isEmpty()) {
Derivation d = candV.removeFirst();
dHatV.add(d);
} else {
break;
}
}
}
private void lazyNext(PriorityQueue<Derivation> candV, Derivation derivation, int kPrime) {
List<Vertex> tails = derivation.arc.tails;
for (int i = 0, sz = derivation.arc.size(); i < sz; i++) {
List<Integer> j = new ArrayList<Integer>(derivation.j);
j.set(i, j.get(i)+1);
Vertex Ti = tails.get(i);
lazyKthBest(Ti, j.get(i), kPrime);
LinkedList<Derivation> dHatTi = dHat.get(Ti);
// compute score for this derivation
if (j.get(i)-1 >= dHatTi.size()) { continue; }
Derivation d = dHatTi.get(j.get(i)-1);
double newScore = derivation.score - derivation.childrenScores.get(i) + d.score;
List<Double> childrenScores = new ArrayList<Double>(derivation.childrenScores);
childrenScores.set(i, d.score);
Derivation newDerivation = new Derivation(derivation.arc, j, newScore, childrenScores);
if (!candV.contains(newDerivation) && newScore > Double.NEGATIVE_INFINITY) {
candV.add(newDerivation, newScore);
}
}
}
//
// END K-BEST STUFF
//
/** 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
*/
@Override
public List<ScoredObject<Tree>> getBestParses() {
int start = 0;
int end = length;
int goal = stateIndex.indexOf(goalStr);
double bestScore = iScore[start][end][goal];
List<Tree> internalTrees = extractBestParses(goal, start, end);
//System.out.println("Got internal best parse...");
// for (Tree internalTree : internalTrees) {
// restoreUnaries(internalTree);
// }
//System.out.println("Restored unaries...");
List<ScoredObject<Tree>> scoredTrees = new ArrayList<ScoredObject<Tree>>(internalTrees.size());
for (Tree tr : internalTrees) {
scoredTrees.add(new ScoredObject<Tree>(tr, bestScore));
}
return scoredTrees;
//TreeTransformer debinarizer = BinarizerFactory.getDebinarizer();
//return debinarizer.transformTree(internalTree);
}
protected List<ParserConstraint> getConstraints() {
return constraints;
}
void setConstraints(List<ParserConstraint> constraints) {
if (constraints == null) {
this.constraints = Collections.emptyList();
} else {
this.constraints = constraints;
}
}
public ExhaustivePCFGParser(BinaryGrammar bg, UnaryGrammar ug, Lexicon lex, Options op, Index<String> stateIndex, Index<String> wordIndex, Index<String> tagIndex) {
// System.out.println("ExhaustivePCFGParser constructor called.");
this.bg = bg;
this.ug = ug;
this.lex = lex;
this.op = op;
this.tlp = op.langpack();
goalStr = tlp.startSymbol();
this.stateIndex = stateIndex;
this.wordIndex = wordIndex;
this.tagIndex = tagIndex;
tf = new LabeledScoredTreeFactory();
numStates = stateIndex.size();
isTag = new boolean[numStates];
// tag index is smaller, so we fill by iterating over the tag index
// rather than over the state index
for (String tag : tagIndex.objectsList()) {
int state = stateIndex.indexOf(tag);
if (state < 0) {
continue;
}
isTag[state] = true;
}
}
public void nudgeDownArraySize() {
try {
if (arraySize > 2) {
considerCreatingArrays(arraySize - 2);
}
} catch (OutOfMemoryError oome) {
oome.printStackTrace();
}
}
private void considerCreatingArrays(int length) {
if (length > op.testOptions.maxLength + 1 || length >= myMaxLength) {
throw new OutOfMemoryError("Refusal to create such large arrays.");
} else {
try {
createArrays(length + 1);
} catch (OutOfMemoryError e) {
myMaxLength = length;
if (arraySize > 0) {
try {
createArrays(arraySize);
} catch (OutOfMemoryError e2) {
throw new RuntimeException("CANNOT EVEN CREATE ARRAYS OF ORIGINAL SIZE!!");
}
}
throw e;
}
arraySize = length + 1;
if (op.testOptions.verbose) {
System.err.println("Created PCFG parser arrays of size " + arraySize);
}
}
}
protected void createArrays(int length) {
// zero out some stuff first in case we recently ran out of memory and are reallocating
clearArrays();
int numTags = tagIndex.size();
// allocate just the parts of iScore and oScore used (end > start, etc.)
// todo: with some modifications to doInsideScores, we wouldn't need to allocate iScore[i,length] for i != 0 and i != length
// System.out.println("initializing iScore arrays with length " + length + " and numStates " + numStates);
iScore = new float[length][length + 1][];
for (int start = 0; start < length; start++) {
for (int end = start + 1; end <= length; end++) {
iScore[start][end] = new float[numStates];
}
}
// System.out.println("finished initializing iScore arrays");
if (op.doDep && !op.testOptions.useFastFactored) {
// System.out.println("initializing oScore arrays with length " + length + " and numStates " + numStates);
oScore = new float[length][length + 1][];
for (int start = 0; start < length; start++) {
for (int end = start + 1; end <= length; end++) {
oScore[start][end] = new float[numStates];
}
}
// System.out.println("finished initializing oScore arrays");
}
narrowRExtent = new int[length][numStates];
wideRExtent = new int[length][numStates];
narrowLExtent = new int[length + 1][numStates];
wideLExtent = new int[length + 1][numStates];
if (op.doDep && !op.testOptions.useFastFactored) {
iPossibleByL = new boolean[length][numStates];
iPossibleByR = new boolean[length + 1][numStates];
oPossibleByL = new boolean[length][numStates];
oPossibleByR = new boolean[length + 1][numStates];
}
tags = new boolean[length][numTags];
if (op.testOptions.lengthNormalization) {
wordsInSpan = new int[length][length + 1][];
for (int start = 0; start < length; start++) {
for (int end = start + 1; end <= length; end++) {
wordsInSpan[start][end] = new int[numStates];
}
}
}
// System.out.println("ExhaustivePCFGParser constructor finished.");
}
private void clearArrays() {
iScore = oScore = null;
iPossibleByL = iPossibleByR = oPossibleByL = oPossibleByR = null;
oFilteredEnd = oFilteredStart = null;
tags = null;
narrowRExtent = wideRExtent = narrowLExtent = wideLExtent = null;
}
} // end class ExhaustivePCFGParser