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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.trees;
import java.io.*;
import java.util.*;
import java.util.function.Predicate;
import edu.stanford.nlp.graph.DirectedMultiGraph;
import edu.stanford.nlp.ling.IndexedWord;
import edu.stanford.nlp.process.Morphology;
import edu.stanford.nlp.semgraph.SemanticGraph;
import edu.stanford.nlp.semgraph.SemanticGraphEdge;
import edu.stanford.nlp.semgraph.semgrex.SemgrexMatcher;
import edu.stanford.nlp.semgraph.semgrex.SemgrexPattern;
import edu.stanford.nlp.util.*;
import static edu.stanford.nlp.trees.UniversalEnglishGrammaticalRelations.*;
import static edu.stanford.nlp.trees.GrammaticalRelation.*;
/**
* A GrammaticalStructure for Universal Dependencies English.
*
* For feeding Stanford parser trees into this class, the Stanford parser should be run with the
* "-retainNPTmpSubcategories" option for best results!
*
* @author Bill MacCartney
* @author Marie-Catherine de Marneffe
* @author Christopher Manning
* @author Daniel Cer (CoNLLX format and alternative user selected dependency
* printer/reader interface)
* @author John Bauer
* @author Sebastian Schuster
*/
public class UniversalEnglishGrammaticalStructure extends GrammaticalStructure {
private static final long serialVersionUID = 1L;
private static final boolean DEBUG = System.getProperty("UniversalEnglishGrammaticalStructure", null) != null;
/**
* Construct a new {@code EnglishGrammaticalStructure} from an existing parse
* tree. The new {@code GrammaticalStructure} has the same tree structure
* and label values as the given tree (but no shared storage). As part of
* construction, the parse tree is analyzed using definitions from
* {@link GrammaticalRelation GrammaticalRelation} to populate
* the new GrammaticalStructure with as many labeled grammatical
* relations as it can.
*
* @param t Parse tree to make grammatical structure from
*/
public UniversalEnglishGrammaticalStructure(Tree t) {
this(t, new PennTreebankLanguagePack().punctuationWordRejectFilter());
}
/**
* This gets used by GrammaticalStructureFactory (by reflection). DON'T DELETE.
*
* @param t Parse tree to make grammatical structure from
* @param tagFilter Filter to remove punctuation dependencies
*/
public UniversalEnglishGrammaticalStructure(Tree t, Predicate tagFilter) {
this(t, tagFilter, new UniversalSemanticHeadFinder(true), true);
}
/**
* This gets used by GrammaticalStructureFactory (by reflection). DON'T DELETE.
*
* @param t Parse tree to make grammatical structure from
* @param tagFilter Tag filter to remove punctuation dependencies
* @param hf HeadFinder to use when building it
*/
public UniversalEnglishGrammaticalStructure(Tree t, Predicate tagFilter, HeadFinder hf) {
this(t, tagFilter, hf, true);
}
/**
* Construct a new GrammaticalStructure from an existing parse
* tree. The new GrammaticalStructure has the same tree structure
* and label values as the given tree (but no shared storage). As part of
* construction, the parse tree is analyzed using definitions from
* {@link GrammaticalRelation GrammaticalRelation} to populate
* the new GrammaticalStructure with as many labeled grammatical
* relations as it can.
*
* @param t Parse tree to make grammatical structure from
* @param tagFilter Filter for punctuation tags
* @param hf HeadFinder to use when building it
* @param threadSafe Whether or not to support simultaneous instances among multiple
* threads
*/
public UniversalEnglishGrammaticalStructure(Tree t, Predicate tagFilter, HeadFinder hf, boolean threadSafe) {
// the tree is normalized (for index and functional tag stripping) inside CoordinationTransformer
super(t, UniversalEnglishGrammaticalRelations.values(threadSafe), threadSafe ? UniversalEnglishGrammaticalRelations.valuesLock() : null,
new CoordinationTransformer(hf, true), hf, Filters.acceptFilter(), tagFilter);
}
/** Used for postprocessing CoNLL X dependencies */
public UniversalEnglishGrammaticalStructure(List projectiveDependencies, TreeGraphNode root) {
super(projectiveDependencies, root);
}
/**
* Returns a Filter which checks dependencies for usefulness as
* extra tree-based dependencies. By default, everything is
* accepted. One example of how this can be useful is in the
* English dependencies, where the REL dependency is used as an
* intermediate and we do not want this to be added when we make a
* second pass over the trees for missing dependencies.
*/
@Override
protected Predicate extraTreeDepFilter() {
return extraTreeDepFilter;
}
private static class ExtraTreeDepFilter implements Predicate, Serializable {
@Override
public boolean test(TypedDependency d) {
return d != null && d.reln() != RELATIVE && d.reln() != PREPOSITION;
}
private static final long serialVersionUID = 1L;
}
private static final Predicate extraTreeDepFilter = new ExtraTreeDepFilter();
@Override
protected void getTreeDeps(List deps,
DirectedMultiGraph completeGraph,
Predicate puncTypedDepFilter,
Predicate extraTreeDepFilter) {
//Do nothing
}
@Override
protected void correctDependencies(List list) {
SemanticGraph sg = new SemanticGraph(list);
correctDependencies(sg);
list.clear();
list.addAll(sg.typedDependencies());
Collections.sort(list);
}
protected void correctDependencies(SemanticGraph sg) {
if (DEBUG) {
printListSorted("At correctDependencies:", sg.typedDependencies());
}
correctSubjPass(sg);
if (DEBUG) {
printListSorted("After correctSubjPass:", sg.typedDependencies());
}
removeExactDuplicates(sg);
if (DEBUG) {
printListSorted("After removeExactDuplicates:", sg.typedDependencies());
}
}
private static void printListSorted(String title, Collection list) {
List lis = new ArrayList(list);
Collections.sort(lis);
if (title != null) {
System.err.println(title);
}
System.err.println(lis);
}
@Override
protected void postProcessDependencies(List list) {
SemanticGraph sg = new SemanticGraph(list);
if (DEBUG) {
printListSorted("At postProcessDependencies:", sg.typedDependencies());
}
correctWHAttachment(sg);
if (DEBUG) {
printListSorted("After corrrecting WH attachment:", sg.typedDependencies());
}
convertRel(sg);
if (DEBUG) {
printListSorted("After converting rel:", sg.typedDependencies());
}
list.clear();
list.addAll(sg.typedDependencies());
}
@Override
protected void getExtras(List list) {
SemanticGraph sg = new SemanticGraph(list);
addRef(sg);
if (DEBUG) {
printListSorted("After adding ref:", sg.typedDependencies());
}
addExtraNSubj(sg);
if (DEBUG) {
printListSorted("After adding extra nsubj:", sg.typedDependencies());
}
list.clear();
list.addAll(sg.typedDependencies());
}
/* Semgrex patterns for prepositional phrases. */
private static SemgrexPattern PASSIVE_AGENT_PATTERN = SemgrexPattern.compile("{}=gov >nmod=reln ({}=mod >case {word:/^(?i:by)$/}=c1) >auxpass {}");
private static SemgrexPattern PREP_MW3_PATTERN = SemgrexPattern.compile("{}=gov [>/^(nmod|advcl|acl)$/=reln ({}=mod >case ({}=c1 >mwe {}=c2 >mwe ({}=c3 !== {}=c2) ))]");
private static SemgrexPattern PREP_MW2_PATTERN = SemgrexPattern.compile("{}=gov >/^(nmod|advcl|acl)$/=reln ({}=mod >case ({}=c1 >mwe {}=c2))");
private static SemgrexPattern PREP_PATTERN = SemgrexPattern.compile("{}=gov >/^(nmod|advcl|acl)$/=reln ({}=mod >case {}=c1)");
/**
* Adds the case marker(s) to all nmod, acl and advcl relations that are
* modified by one or more case markers(s).
*
* @see UniversalEnglishGrammaticalStructure#addCaseMarkersToReln
*/
private static void addCaseMarkerInformation(SemanticGraph sg) {
/* Semgrexes require a graph with a root. */
if (sg.getRoots().isEmpty())
return;
/* passive agent */
SemanticGraph sgCopy = sg.makeSoftCopy();
SemgrexMatcher matcher = PASSIVE_AGENT_PATTERN.matcher(sgCopy);
while (matcher.find()) {
IndexedWord caseMarker = matcher.getNode("c1");
IndexedWord gov = matcher.getNode("gov");
IndexedWord mod = matcher.getNode("mod");
addPassiveAgentToReln(sg, gov, mod, caseMarker);
}
List oldCaseMarkers = Generics.newArrayList();
/* 3-word prepositions */
sgCopy = sg.makeSoftCopy();
matcher = PREP_MW3_PATTERN.matcher(sgCopy);
while (matcher.find()) {
List caseMarkers = Generics.newArrayList(3);
caseMarkers.add(matcher.getNode("c1"));
caseMarkers.add(matcher.getNode("c2"));
caseMarkers.add(matcher.getNode("c3"));
Collections.sort(caseMarkers);
/* We only want to match every case marker once. */
if (caseMarkers.equals(oldCaseMarkers))
continue;
IndexedWord gov = matcher.getNode("gov");
IndexedWord mod = matcher.getNode("mod");
addCaseMarkersToReln(sg, gov, mod, caseMarkers);
oldCaseMarkers = caseMarkers;
}
/* 2-word prepositions */
sgCopy = sg.makeSoftCopy();
matcher = PREP_MW2_PATTERN.matcher(sgCopy);
while (matcher.find()) {
List caseMarkers = Generics.newArrayList(2);
caseMarkers.add(matcher.getNode("c1"));
caseMarkers.add(matcher.getNode("c2"));
Collections.sort(caseMarkers);
/* We only want to match every case marker once. */
if (caseMarkers.equals(oldCaseMarkers))
continue;
IndexedWord gov = matcher.getNode("gov");
IndexedWord mod = matcher.getNode("mod");
addCaseMarkersToReln(sg, gov, mod, caseMarkers);
oldCaseMarkers = caseMarkers;
}
/* Single-word prepositions */
sgCopy = sg.makeSoftCopy();
matcher = PREP_PATTERN.matcher(sgCopy);
while (matcher.find()) {
List caseMarkers = Generics.newArrayList(1);
caseMarkers.add(matcher.getNode("c1"));
if (caseMarkers.equals(oldCaseMarkers))
continue;
IndexedWord gov = matcher.getNode("gov");
IndexedWord mod = matcher.getNode("mod");
addCaseMarkersToReln(sg, gov, mod, caseMarkers);
oldCaseMarkers = caseMarkers;
}
}
private static void addPassiveAgentToReln(SemanticGraph sg,
IndexedWord gov, IndexedWord mod, IndexedWord caseMarker) {
SemanticGraphEdge edge = sg.getEdge(gov, mod);
GrammaticalRelation reln = UniversalEnglishGrammaticalRelations.getNmod("agent");
edge.setRelation(reln);
}
/**
* Appends case marker information to nmod/acl/advcl relations.
*
* E.g. if there is a relation nmod(gov, dep) and case(dep, prep), then
* the nmod relation is renamed to nmod:prep.
*
*
* @param sg semantic graph
* @param gov governor of the nmod/acl/advcl relation
* @param mod modifier of the nmod/acl/advcl relation
* @param caseMarkers List of all the case markers that depend on mod
*/
private static void addCaseMarkersToReln(SemanticGraph sg, IndexedWord gov, IndexedWord mod, List caseMarkers) {
SemanticGraphEdge edge = sg.getEdge(gov, mod);
int lastCaseMarkerIndex = 0;
StringBuilder sb = new StringBuilder();
boolean firstWord = true;
for (IndexedWord cm : caseMarkers) {
/* check for adjacency */
if (lastCaseMarkerIndex == 0 || cm.index() == (lastCaseMarkerIndex + 1)) {
if ( ! firstWord) {
sb.append("_");
}
sb.append(cm.value());
firstWord = false;
} else {
/* Should never happen as there should be never two non-adjacent case markers.
* If it does happen nevertheless create an additional relation.
*/
GrammaticalRelation reln = getCaseMarkedRelation(edge.getRelation(), sb.toString().toLowerCase());
sg.addEdge(gov, mod, reln, Double.NEGATIVE_INFINITY, true);
sb = new StringBuilder(cm.value());
firstWord = true;
}
lastCaseMarkerIndex = cm.index();
}
GrammaticalRelation reln = getCaseMarkedRelation(edge.getRelation(), sb.toString().toLowerCase());
edge.setRelation(reln);
}
private static SemgrexPattern PREP_CONJP_PATTERN = SemgrexPattern.compile("{} >case ({}=gov >cc {}=cc >conj {}=conj)");
/**
* Expands prepositions with conjunctions such as in the sentence
* "Bill flies to and from Serbia." by copying the verb resulting
* in the following relations:
*
* conj:and(flies, flies')
* case(Serbia, to)
* cc(to, and)
* conj(to, from)
* nmod(flies, Serbia)
* nmod(flies', Serbia)
*
* The label of the conjunct relation includes the conjunction type
* because if the verb has multiple cc relations then it can be impossible
* to infer which coordination marker belongs to which conjuncts.
*
* @param list mutable list of dependencies
*/
private static void expandPrepConjunctions(SemanticGraph sg) {
/* Semgrexes require a graph with a root. */
if (sg.getRoots().isEmpty())
return;
SemanticGraph sgCopy = sg.makeSoftCopy();
SemgrexMatcher matcher = PREP_CONJP_PATTERN.matcher(sgCopy);
IndexedWord oldGov = null;
IndexedWord oldCcDep = null;
List conjDeps = Generics.newLinkedList();
while (matcher.find()) {
IndexedWord ccDep = matcher.getNode("cc");
IndexedWord conjDep = matcher.getNode("conj");
IndexedWord gov = matcher.getNode("gov");
if (oldGov != null && (! gov.equals(oldGov) || ! ccDep.equals(oldCcDep))) {
expandPrepConjunction(sg, oldGov, conjDeps, oldCcDep);
conjDeps = Generics.newLinkedList();
}
oldCcDep = ccDep;
oldGov = gov;
conjDeps.add(conjDep);
}
if (oldGov != null) {
expandPrepConjunction(sg, oldGov, conjDeps, oldCcDep);
}
}
/*
* Used by expandPrepConjunctions.
*/
private static void expandPrepConjunction(SemanticGraph sg, IndexedWord gov,
List conjDeps, IndexedWord ccDep) {
IndexedWord caseGov = sg.getParent(gov);
if (caseGov == null)
return;
IndexedWord caseGovGov = sg.getParent(caseGov);
if (caseGovGov == null)
return;
IndexedWord conjGov = caseGovGov.getOriginal() != null ? caseGovGov.getOriginal() : caseGovGov;
GrammaticalRelation rel = sg.reln(caseGovGov, caseGov);
List newConjDeps = Generics.newLinkedList();
for (IndexedWord conjDep : conjDeps) {
//IndexedWord caseGovCopy = caseGov.makeSoftCopy();
IndexedWord caseGovGovCopy = caseGovGov.makeSoftCopy();
/* Change conj(prep-1, prep-2) to case(prep-1-gov-copy, prep-2) */
//SemanticGraphEdge edge = sg.getEdge(gov, conjDep);
//sg.removeEdge(edge);
//sg.addEdge(caseGovCopy, conjDep, CASE_MARKER, Double.NEGATIVE_INFINITY, false);
/* Add relation to copy node. */
//sg.addEdge(caseGovGovCopy, caseGovCopy, rel, Double.NEGATIVE_INFINITY, false);
sg.addEdge(conjGov, caseGovGovCopy, CONJUNCT, Double.NEGATIVE_INFINITY, false);
newConjDeps.add(caseGovGovCopy);
sg.addEdge(caseGovGovCopy, caseGov, rel, Double.NEGATIVE_INFINITY, true);
List caseMarkers = Generics.newArrayList();
caseMarkers.add(conjDep);
addCaseMarkersToReln(sg, caseGovGovCopy, caseGov, caseMarkers);
/* Attach all children except case markers of caseGov to caseGovCopy. */
//for (SemanticGraphEdge e : sg.outgoingEdgeList(caseGov)) {
// if (e.getRelation() != CASE_MARKER && ! e.getDependent().equals(ccDep)) {
// sg.addEdge(caseGovCopy, e.getDependent(), e.getRelation(), Double.NEGATIVE_INFINITY, false);
// }
// }
}
/* Attach CC node to caseGov */
//SemanticGraphEdge edge = sg.getEdge(gov, ccDep);
//sg.removeEdge(edge);
//sg.addEdge(conjGov, ccDep, COORDINATION, Double.NEGATIVE_INFINITY, false);
/* Add conjunction information for these relations already at this point.
* It could be that we add several coordinating conjunctions while collapsing
* and we might not know which conjunction belongs to which conjunct at a later
* point.
*/
addConjToReln(sg, conjGov, newConjDeps, ccDep);
}
private static SemgrexPattern PP_CONJP_PATTERN = SemgrexPattern.compile("{} >/^(nmod|acl|advcl)$/ (({}=gov >case {}) >cc {}=cc >conj ({}=conj >case {}))");
/**
* Expands PPs with conjunctions such as in the sentence
* "Bill flies to France and from Serbia." by copying the verb
* that governs the prepositinal phrase resulting in the following
* relations:
*
* conj:and(flies, flies')
* case(France, to)
* cc(flies, and)
* case(Serbia, from)
* nmod(flies, France)
* nmod(flies', Serbia)
*
* The label of the conjunct relation includes the conjunction type
* because if the verb has multiple cc relations then it can be impossible
* to infer which coordination marker belongs to which conjuncts.
*
* @param sg SemanticGraph to operate on.
*/
private static void expandPPConjunctions(SemanticGraph sg) {
/* Semgrexes require a graph with a root. */
if (sg.getRoots().isEmpty())
return;
SemanticGraph sgCopy = sg.makeSoftCopy();
SemgrexMatcher matcher = PP_CONJP_PATTERN.matcher(sgCopy);
IndexedWord oldGov = null;
IndexedWord oldCcDep = null;
List conjDeps = Generics.newLinkedList();
while (matcher.find()) {
IndexedWord conjDep = matcher.getNode("conj");
IndexedWord gov = matcher.getNode("gov");
IndexedWord ccDep = matcher.getNode("cc");
if (oldGov != null && (! gov.equals(oldGov) || ! ccDep.equals(oldCcDep))) {
expandPPConjunction(sg, oldGov, conjDeps, oldCcDep);
conjDeps = Generics.newLinkedList();
}
oldCcDep = ccDep;
oldGov = gov;
conjDeps.add(conjDep);
}
if (oldGov != null) {
expandPPConjunction(sg, oldGov, conjDeps, oldCcDep);
}
}
/*
* Used by expandPPConjunction.
*/
private static void expandPPConjunction(SemanticGraph sg, IndexedWord gov,
List conjDeps, IndexedWord ccDep) {
IndexedWord nmodGov = sg.getParent(gov);
if (nmodGov == null)
return;
IndexedWord conjGov = nmodGov.getOriginal() != null ? nmodGov.getOriginal() : nmodGov;
GrammaticalRelation rel = sg.reln(nmodGov, gov);
List newConjDeps = Generics.newLinkedList();
for (IndexedWord conjDep : conjDeps) {
IndexedWord nmodGovCopy = nmodGov.makeSoftCopy();
/* Change conj(nmod-1, nmod-2) to nmod(nmod-1-gov, nmod-2) */
SemanticGraphEdge edge = sg.getEdge(gov, conjDep);
if (edge != null) {
sg.removeEdge(edge);
sg.addEdge(nmodGovCopy, conjDep, rel, Double.NEGATIVE_INFINITY, false);
}
/* Add relation to copy node. */
sg.addEdge(conjGov, nmodGovCopy, CONJUNCT, Double.NEGATIVE_INFINITY, false);
newConjDeps.add(nmodGovCopy);
}
/* Attach CC node to conjGov */
SemanticGraphEdge edge = sg.getEdge(gov, ccDep);
if (edge != null) {
sg.removeEdge(edge);
sg.addEdge(conjGov, ccDep, COORDINATION, Double.NEGATIVE_INFINITY, false);
}
/* Add conjunction information for these relations already at this point.
* It could be that we add several coordinating conjunctions while collapsing
* and we might not know which conjunction belongs to which conjunct at a later
* point.
*/
addConjToReln(sg, conjGov, newConjDeps, ccDep);
}
/**
*
* Returns a GrammaticalRelation which combines the original relation and
* the preposition.
*
*/
private static GrammaticalRelation getCaseMarkedRelation(GrammaticalRelation reln, String relationName) {
GrammaticalRelation newReln = reln;
if (reln.getSpecific() != null) {
reln = reln.getParent();
}
if (reln == NOMINAL_MODIFIER) {
newReln = UniversalEnglishGrammaticalRelations.getNmod(relationName);
} else if (reln == ADV_CLAUSE_MODIFIER) {
newReln = UniversalEnglishGrammaticalRelations.getAdvcl(relationName);
} else if (reln == CLAUSAL_MODIFIER) {
newReln = UniversalEnglishGrammaticalRelations.getAcl(relationName);
}
return newReln;
}
private static SemgrexPattern CONJUNCTION_PATTERN = SemgrexPattern.compile("{}=gov >cc {}=cc >conj {}=conj");
/**
* Adds the type of conjunction to all conjunct relations.
*
* cc(Marie, and), conj(Marie, Chris) and conj(Marie, John)
* become cc(Marie, and), conj(Marie, Chris) and conj(Marie, John).
*
* In case multiple coordination marker depend on the same governor
* the one that precedes the conjunct is appended to the conjunction relation or the
* first one if no preceding marker exists.
*
* Some multi-word coordination markers are collapsed to conj:and or conj:negcc.
* See {@link #conjValue(IndexedWord, SemanticGraph)}.
*
* @param list mutable list of dependency relations
*/
private static void addConjInformation(SemanticGraph sg) {
/* Semgrexes require a graph with a root. */
if (sg.getRoots().isEmpty())
return;
SemanticGraph sgCopy = sg.makeSoftCopy();
SemgrexMatcher matcher = CONJUNCTION_PATTERN.matcher(sgCopy);
IndexedWord oldGov = null;
IndexedWord oldCcDep = null;
List conjDeps = Generics.newLinkedList();
while (matcher.find()) {
IndexedWord conjDep = matcher.getNode("conj");
IndexedWord gov = matcher.getNode("gov");
IndexedWord ccDep = matcher.getNode("cc");
if (oldGov != null && (! gov.equals(oldGov) || ! ccDep.equals(oldCcDep))) {
addConjToReln(sg, oldGov, conjDeps, oldCcDep);
conjDeps = Generics.newLinkedList();
}
oldCcDep = ccDep;
conjDeps.add(conjDep);
oldGov = gov;
}
if (oldGov != null) {
addConjToReln(sg, oldGov, conjDeps, oldCcDep);
}
}
/*
* Used by addConjInformation.
*/
private static void addConjToReln(SemanticGraph sg,
IndexedWord gov, List conjDeps, IndexedWord ccDep) {
for (IndexedWord conjDep : conjDeps) {
SemanticGraphEdge edge = sg.getEdge(gov, conjDep);
if (edge.getRelation() == CONJUNCT || conjDep.index() > ccDep.index()) {
edge.setRelation(conjValue(ccDep, sg));
}
}
}
/* Used by correctWHAttachment */
private static SemgrexPattern XCOMP_PATTERN = SemgrexPattern.compile("{}=root >xcomp {}=embedded >/^(dep|dobj)$/ {}=wh ?>/([di]obj)/ {}=obj");
private static Morphology morphology = new Morphology();
/**
* Tries to correct complicated cases of WH-movement in
* sentences such as "What does Mary seem to have?" in
* which "What" should attach to "have" instead of the
* control verb.
*
* @param sg The Semantic graph to operate on.
*/
private static void correctWHAttachment(SemanticGraph sg) {
/* Semgrexes require a graph with a root. */
if (sg.getRoots().isEmpty())
return;
SemanticGraph sgCopy = sg.makeSoftCopy();
SemgrexMatcher matcher = XCOMP_PATTERN.matcher(sgCopy);
while (matcher.findNextMatchingNode()) {
IndexedWord root = matcher.getNode("root");
IndexedWord embeddedVerb = matcher.getNode("embedded");
IndexedWord wh = matcher.getNode("wh");
IndexedWord dobj = matcher.getNode("obj");
/* Check if the object is a WH-word. */
if (wh.tag().startsWith("W")) {
boolean reattach = false;
/* If the control verb already has an object, then
we have to reattach the WH-word to the verb in the embedded clause. */
if (dobj != null) {
reattach = true;
} else {
/* If the control verb can't have an object, we also have to reattach. */
String lemma = morphology.lemma(root.value(), root.tag());
if (lemma.matches(EnglishPatterns.NP_V_S_INF_VERBS_REGEX)) {
reattach = true;
}
}
if (reattach) {
SemanticGraphEdge edge = sg.getEdge(root, wh);
if (edge != null) {
sg.removeEdge(edge);
sg.addEdge(embeddedVerb, wh, DIRECT_OBJECT, Double.NEGATIVE_INFINITY, false);
}
}
}
}
}
/**
* What we do in this method is look for temporary dependencies of
* the type "rel" and "prep". These occur in sentences such as "I saw the man
* who you love". In that case, we should produce dobj(love, who).
* On the other hand, in the sentence "... which Mr. Bush was
* fighting for", we should have case(which, for).
*/
private static void convertRel(SemanticGraph sg) {
for (SemanticGraphEdge prep : sg.findAllRelns(PREPOSITION)) {
boolean changedPrep = false;
for (SemanticGraphEdge nmod : sg.outgoingEdgeIterable(prep.getGovernor())) {
// todo: It would also be good to add a rule here to prefer ccomp nsubj over dobj if there is a ccomp with no subj
// then we could get right: Which eco-friendly options do you think there will be on the new Lexus?
if (nmod.getRelation() != NOMINAL_MODIFIER && nmod.getRelation() != RELATIVE) {
continue;
}
if (prep.getDependent().index() < nmod.getDependent().index()) {
continue;
}
sg.removeEdge(prep);
sg.addEdge(nmod.getDependent(), prep.getDependent(), CASE_MARKER, Double.NEGATIVE_INFINITY, false);
changedPrep = true;
if (nmod.getRelation() == RELATIVE) {
nmod.setRelation(NOMINAL_MODIFIER);
}
break;
}
if ( ! changedPrep) {
prep.setRelation(NOMINAL_MODIFIER);
}
}
/* Rename remaining "rel" relations. */
for (SemanticGraphEdge edge : sg.findAllRelns(RELATIVE)) {
edge.setRelation(DIRECT_OBJECT);
}
}
/**
* Destructively modifies this {@code Collection}
* by collapsing several types of transitive pairs of dependencies or
* by adding additional information from the dependents to the relation
* of the governor.
* If called with a tree of dependencies and both CCprocess and
* includeExtras set to false, then the tree structure is preserved.
*
*
*
* - nominal modifier dependencies: nmod
* -
* If there exist the relations
case(hat, in) and nmod(in, hat) then
* the nmod relation is enhanced to nmod:in(cat, hat).
* The case(hat, in) relation is preserved.
* - clausal modifier of noun/adverbial clause modifier with case markers: acs/advcl
* -
* If there exist the relations
case(attacking, of) and advcl(heard, attacking) then
* the nmod relation is enhanced to nmod:of(heard, attacking).
* The case(attacking, of) relation is preserved.
* - conjunct dependencies
* -
* If there exist the relations
*
cc(investors, and) and
* conj(investors, regulators), then the conj relation is
* enhanced to
* conj:and(investors, regulators)
* - For relative clauses, it will collapse referent
* -
*
ref(man, that) and dobj(love, that) are collapsed
* to dobj(love, man)
*
*/
@Override
protected void collapseDependencies(List list, boolean CCprocess, Extras includeExtras) {
SemanticGraph sg = new SemanticGraph(list);
if (DEBUG) {
printListSorted("collapseDependencies: CCproc: " + CCprocess + " includeExtras: " + includeExtras, sg.typedDependencies());
}
correctDependencies(sg);
if (DEBUG) {
printListSorted("After correctDependencies:", sg.typedDependencies());
}
processMultiwordPreps(sg);
if (DEBUG) {
printListSorted("After processMultiwordPreps:", sg.typedDependencies());
}
expandPPConjunctions(sg);
if (DEBUG) {
printListSorted("After expandPPConjunctions:", sg.typedDependencies());
}
expandPrepConjunctions(sg);
if (DEBUG) {
printListSorted("After expandPrepConjunctions:", sg.typedDependencies());
}
addCaseMarkerInformation(sg);
if (DEBUG) {
printListSorted("After addCaseMarkerInformation:", sg.typedDependencies());
}
addConjInformation(sg);
if (DEBUG) {
printListSorted("After addConjInformation:", sg.typedDependencies());
}
if (includeExtras.doRef) {
addRef(sg);
if (DEBUG) {
printListSorted("After adding ref:", sg.typedDependencies());
}
if (includeExtras.collapseRef) {
collapseReferent(sg);
if (DEBUG) {
printListSorted("After collapse referent:", sg.typedDependencies());
}
}
}
if (CCprocess) {
treatCC(sg);
if (DEBUG) {
printListSorted("After treatCC:", sg.typedDependencies());
}
}
if (includeExtras.doSubj) {
addExtraNSubj(sg);
if (DEBUG) {
printListSorted("After adding extra nsubj:", sg.typedDependencies());
}
correctSubjPass(sg);
if (DEBUG) {
printListSorted("After correctSubjPass:", sg.typedDependencies());
}
}
list.clear();
list.addAll(sg.typedDependencies());
Collections.sort(list);
if (DEBUG) {
printListSorted("After all collapse:", list);
}
}
@Override
protected void collapseDependenciesTree(List list) {
collapseDependencies(list, false, Extras.NONE);
}
/**
* Does some hard coding to deal with relation in CONJP. For now we deal with:
* but not, if not, instead of, rather than, but rather GO TO negcc
* as well as, not to mention, but also, & GO TO and.
*
* @param cc The head dependency of the conjunction marker
* @param sg The complete current semantic graph
* @return A GrammaticalRelation made from a normalized form of that
* conjunction.
*/
private static GrammaticalRelation conjValue(IndexedWord cc, SemanticGraph sg) {
int pos = cc.index();
String newConj = cc.value().toLowerCase();
if (newConj.equals("not")) {
IndexedWord prevWord = sg.getNodeByIndexSafe(pos - 1);
if (prevWord != null && prevWord.value().toLowerCase().equals("but")) {
return UniversalEnglishGrammaticalRelations.getConj("negcc");
}
}
IndexedWord secondIWord = sg.getNodeByIndexSafe(pos + 1);
if (secondIWord == null) {
return UniversalEnglishGrammaticalRelations.getConj(cc.value());
}
String secondWord = secondIWord.value().toLowerCase();
if (newConj.equals("but")) {
if (secondWord.equals("rather")) {
newConj = "negcc";
} else if (secondWord.equals("also")) {
newConj = "and";
}
} else if (newConj.equals("if") && secondWord.equals("not")) {
newConj = "negcc";
} else if (newConj.equals("instead") && secondWord.equals("of")) {
newConj = "negcc";
} else if (newConj.equals("rather") && secondWord.equals("than")) {
newConj = "negcc";
} else if (newConj.equals("as") && secondWord.equals("well")) {
newConj = "and";
} else if (newConj.equals("not") && secondWord.equals("to")) {
IndexedWord thirdIWord = sg.getNodeByIndexSafe(pos + 2);
String thirdWord = thirdIWord != null ? thirdIWord.value().toLowerCase() : null;
if (thirdWord != null && thirdWord.equals("mention")) {
newConj = "and";
}
}
return UniversalEnglishGrammaticalRelations.getConj(newConj);
}
private static void treatCC(SemanticGraph sg) {
// Construct a map from tree nodes to the set of typed
// dependencies in which the node appears as dependent.
Map> map = Generics.newHashMap();
// Construct a map of tree nodes being governor of a subject grammatical
// relation to that relation
Map subjectMap = Generics.newHashMap();
// Construct a set of TreeGraphNodes with a passive auxiliary on them
Set withPassiveAuxiliary = Generics.newHashSet();
// Construct a map of tree nodes being governor of an object grammatical
// relation to that relation
// Map objectMap = new
// HashMap();
List rcmodHeads = Generics.newArrayList();
List prepcDep = Generics.newArrayList();
for (SemanticGraphEdge edge : sg.edgeIterable()) {
if (!map.containsKey(edge.getDependent())) {
// NB: Here and in other places below, we use a TreeSet (which extends
// SortedSet) to guarantee that results are deterministic)
map.put(edge.getDependent(), new TreeSet());
}
map.get(edge.getDependent()).add(edge);
if (edge.getRelation().equals(AUX_PASSIVE_MODIFIER)) {
withPassiveAuxiliary.add(edge.getGovernor());
}
// look for subjects
if (edge.getRelation().getParent() == NOMINAL_SUBJECT
|| edge.getRelation().getParent() == SUBJECT
|| edge.getRelation().getParent() == CLAUSAL_SUBJECT) {
if (!subjectMap.containsKey(edge.getGovernor())) {
subjectMap.put(edge.getGovernor(), edge);
}
}
// look for objects
// this map was only required by the code commented out below, so comment
// it out too
// if (typedDep.reln() == DIRECT_OBJECT) {
// if (!objectMap.containsKey(typedDep.gov())) {
// objectMap.put(typedDep.gov(), typedDep);
// }
// }
// look for rcmod relations
if (edge.getRelation() == RELATIVE_CLAUSE_MODIFIER) {
rcmodHeads.add(edge.getGovernor());
}
// look for prepc relations: put the dependent of such a relation in the
// list
// to avoid wrong propagation of dobj
if (edge.getRelation().toString().startsWith("acl:") || edge.getRelation().toString().startsWith("advcl:")) {
prepcDep.add(edge.getDependent());
}
}
// System.err.println(map);
// if (DEBUG) System.err.println("Subject map: " + subjectMap);
// if (DEBUG) System.err.println("Object map: " + objectMap);
// System.err.println(rcmodHeads);
// create a new list of typed dependencies
//Collection newTypedDeps = new ArrayList(list);
SemanticGraph sgCopy = sg.makeSoftCopy();
// find typed deps of form conj(gov,dep)
for (SemanticGraphEdge edge: sgCopy.edgeIterable()) {
if (UniversalEnglishGrammaticalRelations.getConjs().contains(edge.getRelation())) {
IndexedWord gov = edge.getGovernor();
IndexedWord dep = edge.getDependent();
// look at the dep in the conjunct
Set gov_relations = map.get(gov);
// System.err.println("gov " + gov);
if (gov_relations != null) {
for (SemanticGraphEdge edge1 : gov_relations) {
// System.err.println("gov rel " + td1);
IndexedWord newGov = edge1.getGovernor();
// in the case of errors in the basic dependencies, it
// is possible to have overlapping newGov & dep
if (newGov.equals(dep)) {
continue;
}
GrammaticalRelation newRel = edge1.getRelation();
//TODO: Do we want to copy case markers here?
if (newRel != ROOT && newRel != CASE_MARKER) {
if (rcmodHeads.contains(gov) && rcmodHeads.contains(dep)) {
// to prevent wrong propagation in the case of long dependencies in relative clauses
if (newRel != DIRECT_OBJECT && newRel != NOMINAL_SUBJECT) {
if (DEBUG) {
System.err.println("Adding new " + newRel + " dependency from " + newGov + " to " + dep + " (subj/obj case)");
}
sg.addEdge(newGov, dep, newRel, Double.NEGATIVE_INFINITY, true);
}
} else {
if (DEBUG) {
System.err.println("Adding new " + newRel + " dependency from " + newGov + " to " + dep);
}
sg.addEdge(newGov, dep, newRel, Double.NEGATIVE_INFINITY, true);
}
}
}
}
// propagate subjects
// look at the gov in the conjunct: if it is has a subject relation,
// the dep is a verb and the dep doesn't have a subject relation
// then we want to add a subject relation for the dep.
// (By testing for the dep to be a verb, we are going to miss subject of
// copular verbs! but
// is it safe to relax this assumption?? i.e., just test for the subject
// part)
// CDM 2008: I also added in JJ, since participial verbs are often
// tagged JJ
String tag = dep.tag();
if (subjectMap.containsKey(gov) && (tag.startsWith("VB") || tag.startsWith("JJ")) && ! subjectMap.containsKey(dep)) {
SemanticGraphEdge tdsubj = subjectMap.get(gov);
// check for wrong nsubjpass: if the new verb is VB or VBZ or VBP or JJ, then
// add nsubj (if it is tagged correctly, should do this for VBD too, but we don't)
GrammaticalRelation relation = tdsubj.getRelation();
if (relation == NOMINAL_PASSIVE_SUBJECT) {
if (isDefinitelyActive(tag)) {
relation = NOMINAL_SUBJECT;
}
} else if (relation == CLAUSAL_PASSIVE_SUBJECT) {
if (isDefinitelyActive(tag)) {
relation = CLAUSAL_SUBJECT;
}
} else if (relation == NOMINAL_SUBJECT) {
if (withPassiveAuxiliary.contains(dep)) {
relation = NOMINAL_PASSIVE_SUBJECT;
}
} else if (relation == CLAUSAL_SUBJECT) {
if (withPassiveAuxiliary.contains(dep)) {
relation = CLAUSAL_PASSIVE_SUBJECT;
}
}
if (DEBUG) {
System.err.println("Adding new " + relation + " dependency from " + dep + " to " + tdsubj.getDependent() + " (subj propagation case)");
}
sg.addEdge(dep, tdsubj.getDependent(), relation, Double.NEGATIVE_INFINITY, true);
}
// propagate objects
// cdm july 2010: This bit of code would copy a dobj from the first
// clause to a later conjoined clause if it didn't
// contain its own dobj or prepc. But this is too aggressive and wrong
// if the later clause is intransitive
// (including passivized cases) and so I think we have to not have this
// done always, and see no good "sometimes" heuristic.
// IF WE WERE TO REINSTATE, SHOULD ALSO NOT ADD OBJ IF THERE IS A ccomp
// (SBAR).
// if (objectMap.containsKey(gov) &&
// dep.tag().startsWith("VB") && ! objectMap.containsKey(dep)
// && ! prepcDep.contains(gov)) {
// TypedDependency tdobj = objectMap.get(gov);
// if (DEBUG) {
// System.err.println("Adding new " + tdobj.reln() + " dependency from "
// + dep + " to " + tdobj.dep() + " (obj propagation case)");
// }
// newTypedDeps.add(new TypedDependency(tdobj.reln(), dep,
// tdobj.dep()));
// }
}
}
}
private static boolean isDefinitelyActive(String tag) {
// we should include VBD, but don't as it is often a tagging mistake.
return tag.equals("VB") || tag.equals("VBZ") || tag.equals("VBP") || tag.startsWith("JJ");
}
/**
* This method will collapse a referent relation such as follows. e.g.:
* "The man that I love ... " ref(man, that) dobj(love, that) -> ref(man, that) dobj(love,
* man)
*/
private static void collapseReferent(SemanticGraph sg) {
// find typed deps of form ref(gov, dep)
// put them in a List for processing
List refs = new ArrayList(sg.findAllRelns(REFERENT));
SemanticGraph sgCopy = sg.makeSoftCopy();
// now substitute target of referent where possible
for (SemanticGraphEdge ref : refs) {
IndexedWord dep = ref.getDependent();// take the relative word
IndexedWord ant = ref.getGovernor();// take the antecedent
for (Iterator iter = sgCopy.incomingEdgeIterator(dep); iter.hasNext(); ) {
SemanticGraphEdge edge = iter.next();
// the last condition below maybe shouldn't be necessary, but it has
// helped stop things going haywire a couple of times (it stops the
// creation of a unit cycle that probably leaves something else
// disconnected) [cdm Jan 2010]
if (edge.getRelation() != REFERENT && ! edge.getGovernor().equals(ant)) {
sg.removeEdge(edge);
sg.addEdge(edge.getGovernor(), ant, edge.getRelation(), Double.NEGATIVE_INFINITY, true);
}
}
}
}
/**
* Look for ref rules for a given word. We look through the
* children and grandchildren of the acl:relcl dependency, and if any
* children or grandchildren depend on a that/what/which/etc word,
* we take the leftmost that/what/which/etc word as the dependent
* for the ref TypedDependency.
*/
private static void addRef(SemanticGraph sg) {
for (SemanticGraphEdge edge : sg.findAllRelns(RELATIVE_CLAUSE_MODIFIER)) {
IndexedWord head = edge.getGovernor();
IndexedWord modifier = edge.getDependent();
SemanticGraphEdge leftChildEdge = null;
for (SemanticGraphEdge childEdge : sg.outgoingEdgeIterable(modifier)) {
if (EnglishPatterns.RELATIVIZING_WORD_PATTERN.matcher(childEdge.getDependent().value()).matches() &&
(leftChildEdge == null || childEdge.getDependent().index() < leftChildEdge.getDependent().index())) {
leftChildEdge = childEdge;
}
}
SemanticGraphEdge leftGrandchildEdge = null;
for (SemanticGraphEdge childEdge : sg.outgoingEdgeIterable(modifier)) {
for (SemanticGraphEdge grandchildEdge : sg.outgoingEdgeIterable(childEdge.getDependent())) {
if (EnglishPatterns.RELATIVIZING_WORD_PATTERN.matcher(grandchildEdge.getDependent().value()).matches() &&
(leftGrandchildEdge == null || grandchildEdge.getDependent().index() < leftGrandchildEdge.getDependent().index())) {
leftGrandchildEdge = grandchildEdge;
}
}
}
IndexedWord newDep = null;
if (leftGrandchildEdge != null
&& (leftChildEdge == null || leftGrandchildEdge.getDependent().index() < leftChildEdge.getDependent().index())) {
newDep = leftGrandchildEdge.getDependent();
} else if (leftChildEdge != null) {
newDep = leftChildEdge.getDependent();
}
if (newDep != null && ! sg.containsEdge(head, newDep)) {
sg.addEdge(head, newDep, REFERENT, Double.NEGATIVE_INFINITY, true);
}
}
}
/**
* Add extra nsubj dependencies when collapsing basic dependencies.
*
* In the general case, we look for an aux modifier under an xcomp
* modifier, and assuming there aren't already associated nsubj
* dependencies as daughters of the original xcomp dependency, we
* add nsubj dependencies for each nsubj daughter of the aux.
*
* There is also a special case for "to" words, in which case we add
* a dependency if and only if there is no nsubj associated with the
* xcomp and there is no other aux dependency. This accounts for
* sentences such as "he decided not to" with no following verb.
*/
private static void addExtraNSubj(SemanticGraph sg) {
for (SemanticGraphEdge xcomp : sg.findAllRelns(XCLAUSAL_COMPLEMENT)) {
IndexedWord modifier = xcomp.getDependent();
IndexedWord head = xcomp.getGovernor();
boolean hasSubjectDaughter = false;
boolean hasAux = false;
List subjects = Generics.newArrayList();
List objects = Generics.newArrayList();
for (SemanticGraphEdge dep : sg.edgeIterable()) {
// already have a subject dependency
if ((dep.getRelation() == NOMINAL_SUBJECT || dep.getRelation() == NOMINAL_PASSIVE_SUBJECT) && dep.getGovernor().equals(modifier)) {
hasSubjectDaughter = true;
break;
}
if ((dep.getRelation() == AUX_MODIFIER || dep.getRelation() == MARKER) && dep.getGovernor().equals(modifier)) {
hasAux = true;
}
if ((dep.getRelation() == NOMINAL_SUBJECT || dep.getRelation() == NOMINAL_PASSIVE_SUBJECT) && dep.getGovernor().equals(head)) {
subjects.add(dep.getDependent());
}
if (dep.getRelation() == DIRECT_OBJECT && dep.getGovernor().equals(head)) {
objects.add(dep.getDependent());
}
}
// if we already have an nsubj dependency, no need to add an extra nsubj
if (hasSubjectDaughter) {
continue;
}
if ((modifier.value().equalsIgnoreCase("to") && hasAux) ||
(!modifier.value().equalsIgnoreCase("to") && !hasAux)) {
continue;
}
// In general, we find that the objects of the verb are better
// for extra nsubj than the original nsubj of the verb. For example,
// "Many investors wrote asking the SEC to require ..."
// There is no nsubj of asking, but the dobj, SEC, is the extra nsubj of require.
// Similarly, "The law tells them when to do so"
// Instead of nsubj(do, law) we want nsubj(do, them)
if (objects.size() > 0) {
for (IndexedWord object : objects) {
if ( ! sg.containsEdge(modifier, object))
sg.addEdge(modifier, object, NOMINAL_SUBJECT, Double.NEGATIVE_INFINITY, true);
}
} else {
for (IndexedWord subject : subjects) {
if ( ! sg.containsEdge(modifier, subject))
sg.addEdge(modifier, subject, NOMINAL_SUBJECT, Double.NEGATIVE_INFINITY, true);
}
}
}
}
private static SemgrexPattern CORRECT_SUBJPASS_PATTERN = SemgrexPattern.compile("{}=gov >auxpass {} >/^(nsubj|csubj)$/ {}=subj");
/**
* This method corrects subjects of verbs for which we identified an auxpass,
* but didn't identify the subject as passive.
*
* @param sg SemanticGraph to work on
*/
private static void correctSubjPass(SemanticGraph sg) {
/* If the graph doesn't have a root (most likely because
* a parsing error, we can't match Semgrexes, so do
* nothing. */
if (sg.getRoots().isEmpty())
return;
SemanticGraph sgCopy = sg.makeSoftCopy();
SemgrexMatcher matcher = CORRECT_SUBJPASS_PATTERN.matcher(sgCopy);
while (matcher.find()) {
IndexedWord gov = matcher.getNode("gov");
IndexedWord subj = matcher.getNode("subj");
SemanticGraphEdge edge = sg.getEdge(gov, subj);
GrammaticalRelation reln = null;
if (edge.getRelation() == NOMINAL_SUBJECT) {
reln = NOMINAL_PASSIVE_SUBJECT;
} else if (edge.getRelation() == CLAUSAL_SUBJECT) {
reln = CLAUSAL_PASSIVE_SUBJECT;
}
if (reln != null) {
sg.removeEdge(edge);
sg.addEdge(gov, subj, reln, Double.NEGATIVE_INFINITY, false);
}
}
}
// used by collapse2WP(), collapseFlatMWP(), collapse2WPbis() KEPT IN
// ALPHABETICAL ORDER
private static final String[] MULTIWORD_PREPS = { "according_to", "across_from", "ahead_of", "along_with", "alongside_of", "apart_from", "as_for", "as_from", "as_of", "as_per", "as_to", "aside_from", "away_from", "based_on", "because_of", "close_by", "close_to", "contrary_to", "compared_to", "compared_with", "due_to", "depending_on", "except_for", "exclusive_of", "far_from", "followed_by", "inside_of", "instead_of", "irrespective_of", "next_to", "near_to", "off_of", "out_of", "outside_of", "owing_to", "preliminary_to",
"preparatory_to", "previous_to", "prior_to", "pursuant_to", "regardless_of", "subsequent_to", "such_as", "thanks_to", "together_with"};
// used by collapse3WP() KEPT IN ALPHABETICAL ORDER
private static final String[] THREEWORD_PREPS = { "by_means_of", "in_accordance_with", "in_addition_to", "in_case_of", "in_front_of", "in_lieu_of", "in_place_of", "in_spite_of", "on_account_of", "on_behalf_of", "on_top_of", "with_regard_to", "with_respect_to" };
/**
*
* @param sg
*/
private static void processMultiwordPreps(SemanticGraph sg) {
/* Semgrexes require a graph with a root. */
if (sg.getRoots().isEmpty())
return;
HashMap> bigrams = new HashMap>();
HashMap> trigrams = new HashMap>();
List vertexList = sg.vertexListSorted();
int numWords = vertexList.size();
for (int i = 1; i < numWords; i++) {
String bigram = vertexList.get(i-1).value().toLowerCase() + "_" + vertexList.get(i).value().toLowerCase();
if (bigrams.get(bigram) == null) {
bigrams.put(bigram, new HashSet());
}
bigrams.get(bigram).add(vertexList.get(i-1).index());
if (i > 1) {
String trigram = vertexList.get(i-2).value().toLowerCase() + "_" + bigram;
if (trigrams.get(trigram) == null) {
trigrams.put(trigram, new HashSet());
}
trigrams.get(trigram).add(vertexList.get(i-2).index());
}
}
for (String bigram : MULTIWORD_PREPS) {
if (bigrams.get(bigram) == null) {
continue;
}
for (Integer i : bigrams.get(bigram)) {
IndexedWord w1 = sg.getNodeByIndexSafe(i);
IndexedWord w2 = sg.getNodeByIndexSafe(i + 1);
if (w1 == null || w2 == null) {
continue;
}
IndexedWord gov1 = sg.getParent(w1);
IndexedWord gov2 = sg.getParent(w2);
if (gov1 == null || gov2 == null) {
continue;
}
SemanticGraphEdge edge1 = sg.getEdge(gov1, w1);
SemanticGraphEdge edge2 = sg.getEdge(gov2, w2);
GrammaticalRelation reln1 = edge1.getRelation();
GrammaticalRelation reln2 = edge2.getRelation();
if (reln1 != CASE_MARKER && reln2 != CASE_MARKER) {
continue;
}
IndexedWord caseGov = reln1 == CASE_MARKER ? gov1 : gov2;
IndexedWord caseGovGov = sg.getParent(caseGov);
/* Prevent cycles. */
if (caseGovGov != null && (caseGovGov.equals(w1) || caseGovGov.equals(w2))) {
continue;
}
sg.removeEdge(edge1);
sg.removeEdge(edge2);
sg.addEdge(caseGov, w1, CASE_MARKER, Double.NEGATIVE_INFINITY, false);
sg.addEdge(w1, w2, MULTI_WORD_EXPRESSION, Double.NEGATIVE_INFINITY, false);
}
}
for (String trigram : THREEWORD_PREPS) {
if (trigrams.get(trigram) == null) {
continue;
}
for (Integer i : trigrams.get(trigram)) {
IndexedWord w1 = sg.getNodeByIndexSafe(i);
IndexedWord w2 = sg.getNodeByIndexSafe(i + 1);
IndexedWord w3 = sg.getNodeByIndexSafe(i + 2);
if (w1 == null || w2 == null || w3 == null) {
continue;
}
IndexedWord gov1 = sg.getParent(w1);
IndexedWord gov2 = sg.getParent(w2);
IndexedWord gov3 = sg.getParent(w3);
if (gov1 == null || gov2 == null || gov3 == null) {
continue;
}
SemanticGraphEdge edge1 = sg.getEdge(gov1, w1);
SemanticGraphEdge edge2 = sg.getEdge(gov2, w2);
SemanticGraphEdge edge3 = sg.getEdge(gov3, w3);
GrammaticalRelation reln1 = edge1.getRelation();
GrammaticalRelation reln3 = edge3.getRelation();
if (reln1 != CASE_MARKER && reln3 != CASE_MARKER) {
continue;
}
IndexedWord caseGov = reln3 == CASE_MARKER ? gov3 : gov1;
IndexedWord caseGovGov = sg.getParent(caseGov);
/* Prevent cycles. */
if (caseGovGov != null && (caseGovGov.equals(w1) || caseGovGov.equals(w2) || caseGovGov.equals(w3))) {
continue;
}
sg.removeEdge(edge1);
sg.removeEdge(edge2);
sg.removeEdge(edge3);
sg.addEdge(caseGov, w1, CASE_MARKER, Double.NEGATIVE_INFINITY, false);
sg.addEdge(w1, w2, MULTI_WORD_EXPRESSION, Double.NEGATIVE_INFINITY, false);
sg.addEdge(w1, w3, MULTI_WORD_EXPRESSION, Double.NEGATIVE_INFINITY, false);
}
}
}
/**
* Find and remove any exact duplicates from a dependency list.
* For example, the method that "corrects" nsubj dependencies can
* turn them into nsubjpass dependencies. If there is some other
* source of nsubjpass dependencies, there may now be multiple
* copies of the nsubjpass dependency. If the containing data type
* is a List, they may both now be in the List.
*/
private static void removeExactDuplicates(SemanticGraph sg) {
sg.deleteDuplicateEdges();
}
public static List readCoNLLXGrammaticalStructureCollection(String fileName) throws IOException {
return readCoNLLXGrammaticalStructureCollection(fileName, UniversalEnglishGrammaticalRelations.shortNameToGRel, new FromDependenciesFactory());
}
public static UniversalEnglishGrammaticalStructure buildCoNLLXGrammaticalStructure(List> tokenFields) {
return (UniversalEnglishGrammaticalStructure) buildCoNLLXGrammaticalStructure(tokenFields, UniversalEnglishGrammaticalRelations.shortNameToGRel, new FromDependenciesFactory());
}
public static class FromDependenciesFactory
implements GrammaticalStructureFromDependenciesFactory {
@Override
public UniversalEnglishGrammaticalStructure build(List tdeps, TreeGraphNode root) {
return new UniversalEnglishGrammaticalStructure(tdeps, root);
}
}
} // end class UniversalEnglishGrammaticalStructure