| package org.maltparser.parser;
|
|
|
| import org.maltparser.core.exception.MaltChainedException;
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| import org.maltparser.core.feature.FeatureModel;
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| import org.maltparser.core.symbol.SymbolTableHandler;
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| import org.maltparser.core.syntaxgraph.DependencyStructure;
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|
|
| import org.maltparser.parser.guide.ClassifierGuide;
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| import org.maltparser.parser.guide.SingleGuide;
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| import org.maltparser.parser.history.action.GuideDecision;
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| import org.maltparser.parser.history.action.GuideUserAction;
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| |
| |
| |
|
|
| public class DeterministicParser extends Parser {
|
| private final FeatureModel featureModel;
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| public DeterministicParser(DependencyParserConfig manager, SymbolTableHandler symbolTableHandler) throws MaltChainedException {
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| super(manager,symbolTableHandler);
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| registry.setAlgorithm(this);
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| setGuide(new SingleGuide(this, ClassifierGuide.GuideMode.CLASSIFY));
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| String featureModelFileName = manager.getOptionValue("guide", "features").toString().trim();
|
| if (manager.isLoggerInfoEnabled()) {
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| manager.logDebugMessage(" Feature model : " + featureModelFileName+"\n");
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| manager.logDebugMessage(" Classifier : " + manager.getOptionValueString("guide", "learner")+"\n");
|
| }
|
| String dataSplitColumn = manager.getOptionValue("guide", "data_split_column").toString().trim();
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| String dataSplitStructure = manager.getOptionValue("guide", "data_split_structure").toString().trim();
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| featureModel = manager.getFeatureModelManager().getFeatureModel(SingleGuide.findURL(featureModelFileName, manager), 0, getParserRegistry(), dataSplitColumn, dataSplitStructure);
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| }
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|
|
| public DependencyStructure parse(DependencyStructure parseDependencyGraph) throws MaltChainedException {
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| parserState.clear();
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| parserState.initialize(parseDependencyGraph);
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| currentParserConfiguration = parserState.getConfiguration();
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| TransitionSystem ts = parserState.getTransitionSystem();
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| while (!parserState.isTerminalState()) {
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| GuideUserAction action = ts.getDeterministicAction(parserState.getHistory(), currentParserConfiguration);
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| if (action == null) {
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| action = predict();
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| }
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| parserState.apply(action);
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| }
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|
|
|
|
| parseDependencyGraph.linkAllTreesToRoot();
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| return parseDependencyGraph;
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| }
|
|
|
| private GuideUserAction predict() throws MaltChainedException {
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| GuideUserAction currentAction = parserState.getHistory().getEmptyGuideUserAction();
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| try {
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| classifierGuide.predict(featureModel,(GuideDecision)currentAction);
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| while (!parserState.permissible(currentAction)) {
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| if (classifierGuide.predictFromKBestList(featureModel,(GuideDecision)currentAction) == false) {
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| currentAction = getParserState().getTransitionSystem().defaultAction(parserState.getHistory(), currentParserConfiguration);
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| break;
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| }
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| }
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| } catch (NullPointerException e) {
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| throw new MaltChainedException("The guide cannot be found. ", e);
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| }
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| return currentAction;
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| }
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|
|
| public void terminate() throws MaltChainedException { }
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| }
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|
|
