diff options
Diffstat (limited to 'linguistics/src/main/java/com/yahoo/language/opennlp')
4 files changed, 96 insertions, 127 deletions
diff --git a/linguistics/src/main/java/com/yahoo/language/opennlp/LangDetectModel.java b/linguistics/src/main/java/com/yahoo/language/opennlp/LangDetectModel.java new file mode 100644 index 00000000000..70664b8f79f --- /dev/null +++ b/linguistics/src/main/java/com/yahoo/language/opennlp/LangDetectModel.java @@ -0,0 +1,13 @@ +// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root. +package com.yahoo.language.opennlp; + +import opennlp.tools.langdetect.LanguageDetectorModel; + +/** + * @author jonmv + */ +public interface LangDetectModel { + + LanguageDetectorModel load(); + +} diff --git a/linguistics/src/main/java/com/yahoo/language/opennlp/OpenNlpDetector.java b/linguistics/src/main/java/com/yahoo/language/opennlp/OpenNlpDetector.java new file mode 100644 index 00000000000..e0c0960b920 --- /dev/null +++ b/linguistics/src/main/java/com/yahoo/language/opennlp/OpenNlpDetector.java @@ -0,0 +1,77 @@ +// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root. +package com.yahoo.language.opennlp; + +import com.yahoo.language.Language; +import com.yahoo.language.detect.Detection; +import com.yahoo.language.detect.Detector; +import com.yahoo.language.detect.Hint; +import com.yahoo.language.simple.SimpleDetector; +import opennlp.tools.cmdline.langdetect.LanguageDetectorModelLoader; +import opennlp.tools.langdetect.LanguageDetectorConfig; +import opennlp.tools.langdetect.LanguageDetectorME; +import opennlp.tools.langdetect.LanguageDetectorModel; + +import java.io.IOException; +import java.io.UncheckedIOException; +import java.nio.ByteBuffer; +import java.nio.charset.Charset; +import java.nio.file.Paths; +import java.util.HashMap; +import java.util.Locale; +import java.util.Map; + +import static java.nio.charset.StandardCharsets.UTF_8; + +/** + * Detects the language of some sample text using {@link SimpleDetector} for CJK input, and OpenNLP otherwise. + * + * @author jonmv + */ +class OpenNlpDetector implements Detector { + + private final SimpleDetector simple = new SimpleDetector(); + private final Map<String, Language> languagesByISO3 = new HashMap<>(); + private final LanguageDetectorME detector; + private final LanguageDetectorConfig config; + + OpenNlpDetector(LanguageDetectorModel model) { + detector = new LanguageDetectorME(model); + config = new LanguageDetectorConfig(); + config.setMinDiff(0.02); + config.setChunkSize(64); + for (Locale locale : Locale.getAvailableLocales()) + languagesByISO3.put(locale.getISO3Language(), Language.fromLocale(locale)); + } + + @Override + public Detection detect(byte[] input, int offset, int length, Hint hint) { + Charset encoding = Charset.forName(simple.guessEncoding(input, offset, length)); + return new Detection(detectLanguage(new String(input, offset, length, encoding)), encoding.name(), false); + } + + @Override + public Detection detect(ByteBuffer input, Hint hint) { + if (input.hasArray()) + return detect(input.array(), input.arrayOffset() + input.position(), input.remaining(), hint); + + byte[] buffer = new byte[input.remaining()]; + input.get(buffer); + return detect(buffer, 0, buffer.length, hint); + } + + @Override + public Detection detect(String input, Hint hint) { + return new Detection(detectLanguage(input), UTF_8.name(), false); + } + + private Language detectLanguage(String input) { + Language simpleGuess = simple.guessLanguage(input); + if (simpleGuess != Language.UNKNOWN) + return simpleGuess; + + var prediction = detector.probingPredictLanguages(input, config).getLanguages()[0]; + return prediction.getConfidence() > 0.03 ? languagesByISO3.getOrDefault(prediction.getLang(), Language.UNKNOWN) + : Language.UNKNOWN; + } + +} diff --git a/linguistics/src/main/java/com/yahoo/language/opennlp/OpenNlpLinguistics.java b/linguistics/src/main/java/com/yahoo/language/opennlp/OpenNlpLinguistics.java index a27e726cda8..7ee17559d88 100644 --- a/linguistics/src/main/java/com/yahoo/language/opennlp/OpenNlpLinguistics.java +++ b/linguistics/src/main/java/com/yahoo/language/opennlp/OpenNlpLinguistics.java @@ -7,36 +7,22 @@ import com.yahoo.language.detect.Detector; import com.yahoo.language.process.Tokenizer; import com.yahoo.language.simple.SimpleDetector; import com.yahoo.language.simple.SimpleLinguistics; -import java.util.logging.Logger; -import java.util.logging.Level; +import opennlp.tools.langdetect.LanguageDetectorModel; /** - * Returns a linguistics implementation based on OpenNlp, - * and (optionally, default on) Optimaize for language detection. + * Returns a linguistics implementation based on OpenNlp. * * @author bratseth + * @author jonmv */ public class OpenNlpLinguistics extends SimpleLinguistics { - private static final Logger log = Logger.getLogger(OpenNlpLinguistics.class.getName()); private final Detector detector; - public OpenNlpLinguistics() { - this(true); - } - @Inject - public OpenNlpLinguistics(OpennlpLinguisticsConfig config) { - this(config.detector().enableOptimaize()); - } - - public OpenNlpLinguistics(boolean enableOptimaize) { - this(enableOptimaize ? new OptimaizeDetector() : new SimpleDetector()); - log.log(Level.FINE, "using "+(enableOptimaize ? "Optimaize" : "Simple")+" detector"); - } - - private OpenNlpLinguistics(Detector detector) { - this.detector = detector; + public OpenNlpLinguistics(LangDetectModel model) { + LanguageDetectorModel loaded = model.load(); + this.detector = loaded != null ? new OpenNlpDetector(loaded) : new SimpleDetector(); } @Override diff --git a/linguistics/src/main/java/com/yahoo/language/opennlp/OptimaizeDetector.java b/linguistics/src/main/java/com/yahoo/language/opennlp/OptimaizeDetector.java deleted file mode 100644 index 83947c795fb..00000000000 --- a/linguistics/src/main/java/com/yahoo/language/opennlp/OptimaizeDetector.java +++ /dev/null @@ -1,107 +0,0 @@ -// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root. -package com.yahoo.language.opennlp; - -import com.google.common.base.Optional; -import com.optimaize.langdetect.LanguageDetector; -import com.optimaize.langdetect.LanguageDetectorBuilder; -import com.optimaize.langdetect.i18n.LdLocale; -import com.optimaize.langdetect.ngram.NgramExtractors; -import com.optimaize.langdetect.profiles.LanguageProfile; -import com.optimaize.langdetect.profiles.LanguageProfileReader; -import com.optimaize.langdetect.text.CommonTextObjectFactories; -import com.optimaize.langdetect.text.TextObjectFactory; -import com.yahoo.language.Language; -import com.yahoo.language.detect.Detection; -import com.yahoo.language.detect.Detector; -import com.yahoo.language.detect.Hint; -import com.yahoo.language.simple.SimpleDetector; -import com.yahoo.text.Utf8; - -import java.io.IOException; -import java.io.UncheckedIOException; -import java.nio.ByteBuffer; -import java.util.List; -import java.util.Locale; -import java.util.logging.Logger; -import java.util.logging.Level; - -/** - * Detects the language of some sample text using SimpleDetector for CJK and Optimaize otherwise. - * - * @author bratseth - */ -public class OptimaizeDetector implements Detector { - - private static final Object initGuard = new Object(); - private static TextObjectFactory textObjectFactory = null; - private static LanguageDetector languageDetector = null; - private static final Logger log = Logger.getLogger(OptimaizeDetector.class.getName()); - - static private void initOptimaize() { - synchronized (initGuard) { - if ((textObjectFactory != null) && (languageDetector != null)) return; - - // origin: https://github.com/optimaize/language-detector - // load all languages: - List<LanguageProfile> languageProfiles; - try { - languageProfiles = new LanguageProfileReader().readAllBuiltIn(); - } catch (IOException e) { - throw new UncheckedIOException(e); - } - - //build language detector: - languageDetector = LanguageDetectorBuilder.create(NgramExtractors.standard()) - .withProfiles(languageProfiles) - .build(); - - //create a text object factory - textObjectFactory = CommonTextObjectFactories.forDetectingOnLargeText(); - } - } - - private final SimpleDetector simpleDetector = new SimpleDetector(); - - public OptimaizeDetector() { - initOptimaize(); - } - - @Override - public Detection detect(byte[] input, int offset, int length, Hint hint) { - return new Detection(guessLanguage(input, offset, length), simpleDetector.guessEncoding(input), false); - } - - @Override - public Detection detect(ByteBuffer input, Hint hint) { - byte[] buf = new byte[input.remaining()]; - input.get(buf, 0, buf.length); - return detect(buf, 0, buf.length, hint); - } - - @Override - public Detection detect(String input, Hint hint) { - return new Detection(guessLanguage(input), Utf8.getCharset().name(), false); - } - - private Language guessLanguage(byte[] buf, int offset, int length) { - return guessLanguage(Utf8.toString(buf, offset, length)); - } - - public Language guessLanguage(String input) { - if (input == null || input.length() == 0) return Language.UNKNOWN; - - Language result = simpleDetector.guessLanguage(input); - if (result != Language.UNKNOWN) return result; - - return guessLanguageUsingOptimaize(input); - } - - private static Language guessLanguageUsingOptimaize(String input) { - Optional<LdLocale> result = languageDetector.detect(textObjectFactory.forText(input)); - if ( ! result.isPresent()) return Language.UNKNOWN; - log.log(Level.FINE, () -> "guessing language "+result.get()+" from input: "+input); - - return Language.fromLocale(new Locale(result.get().getLanguage())); - } - -} |