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org.deeplearning4j.models.embeddings.learning.impl.sequence.DBOW Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2015-2018 Skymind, Inc.
*
* This program and the accompanying materials are made available under the
* terms of the Apache License, Version 2.0 which is available at
* https://www.apache.org/licenses/LICENSE-2.0.
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
* SPDX-License-Identifier: Apache-2.0
******************************************************************************/
package org.deeplearning4j.models.embeddings.learning.impl.sequence;
import lombok.NonNull;
import org.deeplearning4j.models.embeddings.WeightLookupTable;
import org.deeplearning4j.models.embeddings.learning.ElementsLearningAlgorithm;
import org.deeplearning4j.models.embeddings.learning.SequenceLearningAlgorithm;
import org.deeplearning4j.models.embeddings.learning.impl.elements.BatchSequences;
import org.deeplearning4j.models.embeddings.learning.impl.elements.SkipGram;
import org.deeplearning4j.models.embeddings.loader.VectorsConfiguration;
import org.deeplearning4j.models.sequencevectors.interfaces.SequenceIterator;
import org.deeplearning4j.models.sequencevectors.sequence.Sequence;
import org.deeplearning4j.models.sequencevectors.sequence.SequenceElement;
import org.deeplearning4j.models.word2vec.wordstore.VocabCache;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.api.rng.Random;
import org.nd4j.linalg.factory.Nd4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicLong;
/**
* @author [email protected]
*/
public class DBOW implements SequenceLearningAlgorithm {
protected VocabCache vocabCache;
protected WeightLookupTable lookupTable;
protected VectorsConfiguration configuration;
protected int window;
protected boolean useAdaGrad;
protected double negative;
protected SkipGram skipGram = new SkipGram<>();
private static final Logger log = LoggerFactory.getLogger(DBOW.class);
@Override
public ElementsLearningAlgorithm getElementsLearningAlgorithm() {
return skipGram;
}
public DBOW() {
}
@Override
public String getCodeName() {
return "PV-DBOW";
}
@Override
public void configure(@NonNull VocabCache vocabCache, @NonNull WeightLookupTable lookupTable,
@NonNull VectorsConfiguration configuration) {
this.vocabCache = vocabCache;
this.lookupTable = lookupTable;
this.window = configuration.getWindow();
this.useAdaGrad = configuration.isUseAdaGrad();
this.negative = configuration.getNegative();
this.configuration = configuration;
skipGram.configure(vocabCache, lookupTable, configuration);
}
/**
* DBOW doesn't involves any pretraining
*
* @param iterator
*/
@Override
public void pretrain(SequenceIterator iterator) {
}
@Override
public double learnSequence(@NonNull Sequence sequence, @NonNull AtomicLong nextRandom, double learningRate,
BatchSequences batchSequences) {
// we just pass data to dbow, and loop over sequence there
dbow(0, sequence, (int) nextRandom.get() % window, nextRandom, learningRate, false, null,
batchSequences);
return 0;
}
/**
* DBOW has no reasons for early termination
* @return
*/
@Override
public boolean isEarlyTerminationHit() {
return false;
}
protected void dbow(int i, Sequence sequence, int b, AtomicLong nextRandom, double alpha, boolean isInference,
INDArray inferenceVector, BatchSequences batchSequences) {
//final T word = sequence.getElements().get(i);
List sentence = skipGram.applySubsampling(sequence, nextRandom).getElements();
if (sequence.getSequenceLabel() == null)
return;
List labels = new ArrayList<>();
labels.addAll(sequence.getSequenceLabels());
if (sentence.isEmpty() || labels.isEmpty())
return;
int batchSize = configuration.getBatchSize();
for (T lastWord : labels) {
for (T word : sentence) {
if (word == null)
continue;
if (batchSize == 1 || batchSequences == null || isInference)
skipGram.iterateSample(word, lastWord, nextRandom, alpha, isInference, inferenceVector);
else
batchSequences.put(word, lastWord, nextRandom.get(), alpha);
}
}
if (skipGram != null && skipGram.getBatch() != null && skipGram.getBatch() != null
&& skipGram.getBatch().size() >= configuration.getBatchSize()) {
Nd4j.getExecutioner().exec(skipGram.getBatch());
skipGram.getBatch().clear();
}
}
/**
* This method does training on previously unseen paragraph, and returns inferred vector
*
* @param sequence
* @param nextRandom
* @param learningRate
* @return
*/
@Override
public INDArray inferSequence(Sequence sequence, long nextRandom, double learningRate, double minLearningRate,
int iterations) {
AtomicLong nr = new AtomicLong(nextRandom);
// we probably don't want subsampling here
// Sequence seq = cbow.applySubsampling(sequence, nextRandom);
// if (sequence.getSequenceLabel() == null) throw new IllegalStateException("Label is NULL");
if (sequence.isEmpty())
return null;
Random random = Nd4j.getRandomFactory().getNewRandomInstance(configuration.getSeed() * sequence.hashCode(),
lookupTable.layerSize() + 1);
INDArray ret = Nd4j.rand(new int[] {1, lookupTable.layerSize()}, random).subi(0.5)
.divi(lookupTable.layerSize());
for (int iter = 0; iter < iterations; iter++) {
nr.set(Math.abs(nr.get() * 25214903917L + 11));
dbow(0, sequence, (int) nr.get() % window, nr, learningRate, true, ret, null);
learningRate = ((learningRate - minLearningRate) / (iterations - iter)) + minLearningRate;
}
finish();
return ret;
}
@Override
public void finish() {
if (skipGram != null && skipGram.getBatch() != null && !skipGram.getBatch().isEmpty()) {
Nd4j.getExecutioner().exec(skipGram.getBatch());
skipGram.getBatch().clear();
}
}
}