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[SYSTEMDS-3580] Add word embedding encoder
This patch extends the transformapply API to accept the pre-trained word embeddings along with the dictionary as inputs. The new word embedding column encoder is placed after recode and replace the recoded indices with the embedding vectors. This addition removes the requirement of a matrix multiplication to produce the embedding matrix. The current implementation is slower than the baseline (w/ MatMult). The future commits will introduce a new dense block to deduplicate the large embeddings and multi-threading. Closes #1839
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src/main/java/org/apache/sysds/runtime/transform/encode/ColumnEncoderWordEmbedding.java
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you 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. | ||
| */ | ||
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| package org.apache.sysds.runtime.transform.encode; | ||
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| import org.apache.commons.lang.NotImplementedException; | ||
| import org.apache.sysds.runtime.DMLRuntimeException; | ||
| import org.apache.sysds.runtime.controlprogram.caching.CacheBlock; | ||
| import org.apache.sysds.runtime.frame.data.FrameBlock; | ||
| import org.apache.sysds.runtime.matrix.data.MatrixBlock; | ||
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| import static org.apache.sysds.runtime.util.UtilFunctions.getEndIndex; | ||
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| public class ColumnEncoderWordEmbedding extends ColumnEncoder { | ||
| private MatrixBlock wordEmbeddings; | ||
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| //domain size is equal to the number columns of the embedding column (equal to length of an embedding vector) | ||
| @Override | ||
| public int getDomainSize(){ | ||
| return wordEmbeddings.getNumColumns(); | ||
| } | ||
| protected ColumnEncoderWordEmbedding(int colID) { | ||
| super(colID); | ||
| } | ||
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| @Override | ||
| protected double getCode(CacheBlock<?> in, int row) { | ||
| throw new NotImplementedException(); | ||
| } | ||
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| @Override | ||
| protected double[] getCodeCol(CacheBlock<?> in, int startInd, int blkSize) { | ||
| throw new NotImplementedException(); | ||
| } | ||
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| //previous recode replaced strings with indices of the corresponding matrix row index | ||
| //now, the indices are replaced with actual word embedding vectors | ||
| //current limitation: in case the transform is done on multiple cols, the same embedding | ||
| //matrix is used for both transform | ||
| @Override | ||
| public void applyDense(CacheBlock<?> in, MatrixBlock out, int outputCol, int rowStart, int blk){ | ||
| if (!(in instanceof MatrixBlock)){ | ||
| throw new DMLRuntimeException("ColumnEncoderWordEmbedding called with: " + in.getClass().getSimpleName() + | ||
| " and not MatrixBlock"); | ||
| } | ||
| int rowEnd = getEndIndex(in.getNumRows(), rowStart, blk); | ||
| //map each recoded index to the corresponding embedding vector | ||
| for(int i=rowStart; i<rowEnd; i++){ | ||
| double embeddingIndex = in.getDouble(i, outputCol); | ||
| //fill row with zeroes | ||
| if(Double.isNaN(embeddingIndex)){ | ||
| for (int j = outputCol; j < outputCol + getDomainSize(); j++) | ||
| out.quickSetValue(i, j, 0.0); | ||
| } | ||
| //array copy | ||
| else{ | ||
| for (int j = outputCol; j < outputCol + getDomainSize(); j++){ | ||
| out.quickSetValue(i, j, wordEmbeddings.quickGetValue((int) embeddingIndex - 1,j - outputCol )); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| @Override | ||
| protected TransformType getTransformType() { | ||
| return TransformType.WORD_EMBEDDING; | ||
| } | ||
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| @Override | ||
| public void build(CacheBlock<?> in) { | ||
| throw new NotImplementedException(); | ||
| } | ||
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| @Override | ||
| public void allocateMetaData(FrameBlock meta) { | ||
| throw new NotImplementedException(); | ||
| } | ||
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| @Override | ||
| public FrameBlock getMetaData(FrameBlock out) { | ||
| throw new NotImplementedException(); | ||
| } | ||
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| @Override | ||
| public void initMetaData(FrameBlock meta) { | ||
| return; | ||
| } | ||
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| //save embeddings matrix reference for apply step | ||
| @Override | ||
| public void initEmbeddings(MatrixBlock embeddings){ | ||
| this.wordEmbeddings = embeddings; | ||
| } | ||
| } |
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