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/*******************************************************************************
* 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.sequencevectors.sequence;
import org.nd4j.shade.guava.util.concurrent.AtomicDouble;
import lombok.Getter;
import lombok.NonNull;
import lombok.Setter;
import org.deeplearning4j.models.word2vec.VocabWord;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.util.HashUtil;
import org.nd4j.shade.jackson.annotation.*;
import org.nd4j.shade.jackson.databind.DeserializationFeature;
import org.nd4j.shade.jackson.databind.MapperFeature;
import org.nd4j.shade.jackson.databind.ObjectMapper;
import org.nd4j.shade.jackson.databind.SerializationFeature;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicLong;
/**
* SequenceElement is basic building block for SequenceVectors. Any data sequence can be represented as ordered set of SequenceElements,
* and then one can learn distributed representation of each SequenceElement in this sequence using CBOW or SkipGram.
*
* @author [email protected]
*/
@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, include = JsonTypeInfo.As.PROPERTY, property = "@class")
@JsonSubTypes({
@JsonSubTypes.Type(value = VocabWord.class, name = "vocabWord")
})
@JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.ANY, getterVisibility = JsonAutoDetect.Visibility.NONE,
setterVisibility = JsonAutoDetect.Visibility.NONE)
public abstract class SequenceElement implements Comparable, Serializable {
private static final long serialVersionUID = 2223750736522624732L;
@JsonProperty
protected AtomicDouble elementFrequency = new AtomicDouble(0);
//used in comparison when building the huffman tree
protected int index = -1;
protected List codes = new ArrayList<>();
protected List points = new ArrayList<>();
protected short codeLength = 0;
// this var defines, if this token can't be truncated with minWordFrequency threshold
@Getter
@Setter
protected boolean special;
// this var defines that we have label here
protected boolean isLabel;
// this var defines how many documents/sequences contain this word
protected AtomicLong sequencesCount = new AtomicLong(0);
// this var is used as state for preciseWeightInit routine, to avoid multiple initializations for the same data
@Getter
@Setter
protected boolean init;
/*
Reserved for Joint/Distributed vocabs mechanics
*/
@Setter
protected Long storageId;
@Getter
@Setter
protected boolean isLocked;
/**
* This method should return string representation of this SequenceElement, so it can be used for
*
* @return
*/
abstract public String getLabel();
/**
* This method returns number of documents/sequences where this element was evidenced
*
* @return
*/
public long getSequencesCount() {
return sequencesCount.get();
}
/**
* This method sets documents count to specified value
*
* @param count
*/
public void setSequencesCount(long count) {
this.sequencesCount.set(count);
}
/**
* Increments document count by one
*/
public void incrementSequencesCount() {
this.sequencesCount.incrementAndGet();
}
/**
* Increments document count by specified value
* @param count
*/
public void incrementSequencesCount(long count) {
this.sequencesCount.addAndGet(count);
}
/**
* Returns whether this element was defined as label, or no
*
* @return
*/
public boolean isLabel() {
return isLabel;
}
/**
* This method specifies, whether this element should be treated as label for some sequence/document or not.
*
* @param isLabel
*/
public void markAsLabel(boolean isLabel) {
this.isLabel = isLabel;
}
/**
* This method returns SequenceElement's frequency in current training corpus.
*
* @return
*/
public double getElementFrequency() {
return elementFrequency.get();
}
/**
* This method sets frequency value for this element
*
* @param value
*/
public void setElementFrequency(long value) {
elementFrequency.set(value);
}
/**
* Increases element frequency counter by 1
*/
public void incrementElementFrequency() {
increaseElementFrequency(1);
}
/**
* Increases element frequency counter by argument
*
* @param by
*/
public void increaseElementFrequency(int by) {
elementFrequency.getAndAdd(by);
}
/**
* Equals method override should be properly implemented for any extended class, otherwise it will be based on label equality
*
* @param object
* @return
*/
public boolean equals(Object object) {
if (this == object)
return true;
if (object == null)
return false;
if (!(object instanceof SequenceElement))
return false;
return this.getLabel().equals(((SequenceElement) object).getLabel());
}
/**
* Returns index in Huffman tree
*
* @return index >= 0, if tree was built, -1 otherwise
*/
public int getIndex() {
return index;
}
/**
* Sets index in Huffman tree
*
* @param index
*/
public void setIndex(int index) {
this.index = index;
}
/**
* Returns Huffman tree codes
* @return
*/
public List getCodes() {
return codes;
}
/**
* Sets Huffman tree codes
* @param codes
*/
public void setCodes(List codes) {
this.codes = codes;
}
/**
* Returns Huffman tree points
*
* @return
*/
public List getPoints() {
return points;
}
/**
* Sets Huffman tree points
*
* @param points
*/
public void setPoints(List points) {
this.points = points;
}
/**
* Sets Huffman tree points
*
* @param points
*/
@JsonIgnore
public void setPoints(int[] points) {
this.points = new ArrayList<>();
for (int i = 0; i < points.length; i++) {
this.points.add(points[i]);
}
}
/**
* Returns Huffman code length.
*
* Please note: maximum vocabulary/tree size depends on code length
*
* @return
*/
public int getCodeLength() {
return codeLength;
}
/**
* This method fills codes and points up to codeLength
*
* @param codeLength
*/
public void setCodeLength(short codeLength) {
this.codeLength = codeLength;
if (codes.size() < codeLength) {
for (int i = 0; i < codeLength; i++)
codes.add((byte) 0);
}
if (points.size() < codeLength) {
for (int i = 0; i < codeLength; i++)
points.add(0);
}
}
public static final long getLongHash(@NonNull String string) {
return HashUtil.getLongHash(string);
}
/**
* Returns gradient for this specific element, at specific position
* @param index
* @param g
* @param lr
* @return
*/
@Deprecated
public double getGradient(int index, double g, double lr) {
/*
if (adaGrad == null)
adaGrad = new AdaGrad(1,getCodeLength(), lr);
return adaGrad.getGradient(g, index, new int[]{1, getCodeLength()});
*/
return 0.0;
}
@Deprecated
public void setHistoricalGradient(INDArray gradient) {
/*
if (adaGrad == null)
adaGrad = new AdaGrad(1,getCodeLength(), 0.025);
adaGrad.setHistoricalGradient(gradient);
*/
}
@Deprecated
public INDArray getHistoricalGradient() {
/*
if (adaGrad == null)
adaGrad = new AdaGrad(1,getCodeLength(), 0.025);
return adaGrad.getHistoricalGradient();
*/
return null;
}
/**
* hashCode method override should be properly implemented for any extended class, otherwise it will be based on label hashCode
*
* @return hashCode for this SequenceElement
*/
public int hashCode() {
if (this.getLabel() == null)
throw new IllegalStateException("Label should not be null");
return this.getLabel().hashCode();
}
@Override
public int compareTo(SequenceElement o) {
return Double.compare(elementFrequency.get(), o.elementFrequency.get());
}
@Override
public String toString() {
return "SequenceElement: {label: '" + this.getLabel() + "'," + " freq: '" + elementFrequency.get() + "',"
+ " codes: " + codes.toString() + " points: " + points.toString() + " index: '" + this.index
+ "'}";
}
/**
*
* @return
*/
public abstract String toJSON();
public Long getStorageId() {
if (storageId == null)
storageId = SequenceElement.getLongHash(this.getLabel());
return storageId;
}
public static ObjectMapper mapper() {
/*
DO NOT ENABLE INDENT_OUTPUT FEATURE
we need THIS json to be single-line
*/
ObjectMapper ret = new ObjectMapper();
ret.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
ret.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
ret.configure(MapperFeature.SORT_PROPERTIES_ALPHABETICALLY, true);
return ret;
}
}
