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Java example source code file (Word2VecChange.java)

This example Java source code file (Word2VecChange.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

deprecated, hashmap, hashset, indarray, integer, iterator, map, serializable, set, triple, util, word2vecchange, word2vecparam

The Word2VecChange.java Java example source code

/*
 *
 *  * Copyright 2015 Skymind,Inc.
 *  *
 *  *    Licensed under the Apache License, Version 2.0 (the "License");
 *  *    you may not use this file except in compliance with the License.
 *  *    You may obtain a copy of the License at
 *  *
 *  *        http://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.
 *
 */

package org.deeplearning4j.spark.models.embeddings.word2vec;

import org.deeplearning4j.berkeley.Triple;
import org.deeplearning4j.models.embeddings.inmemory.InMemoryLookupTable;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.factory.Nd4j;

import java.io.Serializable;
import java.util.*;

/**
 * @author Adam Gibson
 */
@Deprecated
public class Word2VecChange implements Serializable {
    private Map<Integer,Set changes = new HashMap<>();

    public Word2VecChange(List<Triple counterMap, Word2VecParam param) {
        Iterator<Triple iter = counterMap.iterator();
        while (iter.hasNext()) {
            Triple<Integer,Integer,Integer> next = iter.next();
            Integer point = next.getFirst();
            Integer index = next.getSecond();

            Set<INDArray> changes = this.changes.get(point);
            if(changes == null) {
                changes = new HashSet<>();
                this.changes.put(point,changes);
            }

            changes.add(param.getWeights().getSyn1().slice(index));

        }
    }

    /**
     * Take the changes and apply them
     * to the given table
     * @param table the memory lookup table
     *              to apply the changes to
     */
    public void apply(InMemoryLookupTable table) {

        for(Integer i : changes.keySet()) {
            Set<INDArray> changes = this.changes.get(i);
            INDArray toChange = table.getSyn0().slice(i);
            for(INDArray syn1 : changes)
                Nd4j.getBlasWrapper().level1().axpy(toChange.length(), 1, syn1, toChange);
        }
    }
}

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