/// <summary>
/// Run forward part on given single device
/// </summary>
/// <param name="g">The computing graph for current device. It gets created and passed by the framework</param>
/// <param name="srcSnts">A batch of input tokenized sentences in source side</param>
/// <param name="tgtSnts">A batch of output tokenized sentences in target side. In training mode, it inputs target tokens, otherwise, it outputs target tokens generated by decoder</param>
/// <param name="deviceIdIdx">The index of current device</param>
/// <returns>The cost of forward part</returns>
private float RunForwardOnSingleDevice(IComputeGraph g, List <List <string> > srcSnts, List <List <string> > tgtSnts, int deviceIdIdx, bool isTraining)
{
(IEncoder encoder, IWeightTensor srcEmbedding, IWeightTensor posEmbedding, FeedForwardLayer decoderFFLayer) = GetNetworksOnDeviceAt(deviceIdIdx);
// Reset networks
encoder.Reset(g.GetWeightFactory(), srcSnts.Count);
List <int> originalSrcLengths = ParallelCorpus.PadSentences(srcSnts);
int seqLen = srcSnts[0].Count;
int batchSize = srcSnts.Count;
// Encoding input source sentences
IWeightTensor encOutput = Encode(g, srcSnts, encoder, srcEmbedding, null, posEmbedding, originalSrcLengths);
IWeightTensor ffLayer = decoderFFLayer.Process(encOutput, batchSize, g);
IWeightTensor ffLayerBatch = g.TransposeBatch(ffLayer, batchSize);
float cost = 0.0f;
using (IWeightTensor probs = g.Softmax(ffLayerBatch, runGradients: false, inPlace: true))
{
if (isTraining)
{
//Calculate loss for each word in the batch
for (int k = 0; k < batchSize; k++)
{
for (int j = 0; j < seqLen; j++)
{
using (IWeightTensor probs_k_j = g.PeekRow(probs, k * seqLen + j, runGradients: false))
{
int ix_targets_k_j = m_modelMetaData.Vocab.GetTargetWordIndex(tgtSnts[k][j]);
float score_k = probs_k_j.GetWeightAt(ix_targets_k_j);
cost += (float)-Math.Log(score_k);
probs_k_j.SetWeightAt(score_k - 1, ix_targets_k_j);
}
}
////CRF part
//using (var probs_k = g.PeekRow(probs, k * seqLen, seqLen, runGradients: false))
//{
// var weights_k = probs_k.ToWeightArray();
// var crfOutput_k = m_crfDecoder.ForwardBackward(seqLen, weights_k);
// int[] trueTags = new int[seqLen];
// for (int j = 0; j < seqLen; j++)
// {
// trueTags[j] = m_modelMetaData.Vocab.GetTargetWordIndex(tgtSnts[k][j]);
// }
// m_crfDecoder.UpdateBigramTransition(seqLen, crfOutput_k, trueTags);
//}
}
ffLayerBatch.CopyWeightsToGradients(probs);
}
else
{
// CRF decoder
//for (int k = 0; k < batchSize; k++)
//{
// //CRF part
// using (var probs_k = g.PeekRow(probs, k * seqLen, seqLen, runGradients: false))
// {
// var weights_k = probs_k.ToWeightArray();
// var crfOutput_k = m_crfDecoder.DecodeNBestCRF(weights_k, seqLen, 1);
// var targetWords = m_modelMetaData.Vocab.ConvertTargetIdsToString(crfOutput_k[0].ToList());
// tgtSnts.Add(targetWords);
// }
//}
// Output "i"th target word
int[] targetIdx = g.Argmax(probs, 1);
List <string> targetWords = m_modelMetaData.Vocab.ConvertTargetIdsToString(targetIdx.ToList());
for (int k = 0; k < batchSize; k++)
{
tgtSnts[k] = targetWords.GetRange(k * seqLen, seqLen);
}
}
}
return(cost);
}
public void Valid(ParallelCorpus validCorpus, List <IMetric> metrics)
{
RunValid(validCorpus, RunForwardOnSingleDevice, metrics, true);
}
/// <summary>
/// Build vocabulary from training corpus
/// </summary>
/// <param name="trainCorpus"></param>
/// <param name="minFreq"></param>
public Vocab(ParallelCorpus trainCorpus, int minFreq = 1)
{
Logger.WriteLine($"Building vocabulary from given training corpus.");
// count up all words
Dictionary <string, int> s_d = new Dictionary <string, int>();
Dictionary <string, int> t_d = new Dictionary <string, int>();
CreateIndex();
foreach (SntPairBatch sntPairBatch in trainCorpus)
{
foreach (SntPair sntPair in sntPairBatch.SntPairs)
{
var item = sntPair.SrcSnt;
for (int i = 0, n = item.Length; i < n; i++)
{
var txti = item[i];
if (s_d.Keys.Contains(txti))
{
s_d[txti] += 1;
}
else
{
s_d.Add(txti, 1);
}
}
var item2 = sntPair.TgtSnt;
for (int i = 0, n = item2.Length; i < n; i++)
{
var txti = item2[i];
if (t_d.Keys.Contains(txti))
{
t_d[txti] += 1;
}
else
{
t_d.Add(txti, 1);
}
}
}
}
var q = 3;
foreach (var ch in s_d)
{
if (ch.Value >= minFreq)
{
// add word to vocab
SrcWordToIndex[ch.Key] = q;
m_srcIndexToWord[q] = ch.Key;
m_srcVocab.Add(ch.Key);
q++;
}
}
Logger.WriteLine($"Source language Max term id = '{q}'");
q = 3;
foreach (var ch in t_d)
{
if (ch.Value >= minFreq)
{
// add word to vocab
TgtWordToIndex[ch.Key] = q;
m_tgtIndexToWord[q] = ch.Key;
m_tgtVocab.Add(ch.Key);
q++;
}
}
Logger.WriteLine($"Target language Max term id = '{q}'");
}
private static void Main(string[] args)
{
Logger.LogFile = $"{nameof(Seq2SeqConsole)}_{GetTimeStamp(DateTime.Now)}.log";
ShowOptions(args);
//Parse command line
Options opts = new Options();
ArgParser argParser = new ArgParser(args, opts);
if (string.IsNullOrEmpty(opts.ConfigFilePath) == false)
{
Logger.WriteLine($"Loading config file from '{opts.ConfigFilePath}'");
opts = JsonConvert.DeserializeObject <Options>(File.ReadAllText(opts.ConfigFilePath));
}
AttentionSeq2Seq ss = null;
ProcessorTypeEnums processorType = (ProcessorTypeEnums)Enum.Parse(typeof(ProcessorTypeEnums), opts.ProcessorType);
EncoderTypeEnums encoderType = (EncoderTypeEnums)Enum.Parse(typeof(EncoderTypeEnums), opts.EncoderType);
DecoderTypeEnums decoderType = (DecoderTypeEnums)Enum.Parse(typeof(DecoderTypeEnums), opts.DecoderType);
ModeEnums mode = (ModeEnums)Enum.Parse(typeof(ModeEnums), opts.TaskName);
//Parse device ids from options
int[] deviceIds = opts.DeviceIds.Split(',').Select(x => int.Parse(x)).ToArray();
if (mode == ModeEnums.Train)
{
// Load train corpus
ParallelCorpus trainCorpus = new ParallelCorpus(opts.TrainCorpusPath, opts.SrcLang, opts.TgtLang, opts.BatchSize, opts.ShuffleBlockSize, opts.MaxSentLength);
// Load valid corpus
ParallelCorpus validCorpus = string.IsNullOrEmpty(opts.ValidCorpusPath) ? null : new ParallelCorpus(opts.ValidCorpusPath, opts.SrcLang, opts.TgtLang, opts.BatchSize, opts.ShuffleBlockSize, opts.MaxSentLength);
// Create learning rate
ILearningRate learningRate = new DecayLearningRate(opts.StartLearningRate, opts.WarmUpSteps, opts.WeightsUpdateCount);
// Create optimizer
AdamOptimizer optimizer = new AdamOptimizer(opts.GradClip, opts.Beta1, opts.Beta2);
// Create metrics
List <IMetric> metrics = new List <IMetric>
{
new BleuMetric(),
new LengthRatioMetric()
};
if (!String.IsNullOrEmpty(opts.ModelFilePath) && File.Exists(opts.ModelFilePath))
{
//Incremental training
Logger.WriteLine($"Loading model from '{opts.ModelFilePath}'...");
ss = new AttentionSeq2Seq(modelFilePath: opts.ModelFilePath, processorType: processorType, dropoutRatio: opts.DropoutRatio, deviceIds: deviceIds,
isSrcEmbTrainable: opts.IsSrcEmbeddingTrainable, isTgtEmbTrainable: opts.IsTgtEmbeddingTrainable, isEncoderTrainable: opts.IsEncoderTrainable, isDecoderTrainable: opts.IsDecoderTrainable,
maxTgtSntSize: opts.MaxSentLength);
}
else
{
// Load or build vocabulary
Vocab vocab = null;
if (!string.IsNullOrEmpty(opts.SrcVocab) && !string.IsNullOrEmpty(opts.TgtVocab))
{
// Vocabulary files are specified, so we load them
vocab = new Vocab(opts.SrcVocab, opts.TgtVocab);
}
else
{
// We don't specify vocabulary, so we build it from train corpus
vocab = new Vocab(trainCorpus);
}
//New training
ss = new AttentionSeq2Seq(embeddingDim: opts.WordVectorSize, hiddenDim: opts.HiddenSize, encoderLayerDepth: opts.EncoderLayerDepth, decoderLayerDepth: opts.DecoderLayerDepth,
srcEmbeddingFilePath: opts.SrcEmbeddingModelFilePath, tgtEmbeddingFilePath: opts.TgtEmbeddingModelFilePath, vocab: vocab, modelFilePath: opts.ModelFilePath,
dropoutRatio: opts.DropoutRatio, processorType: processorType, deviceIds: deviceIds, multiHeadNum: opts.MultiHeadNum, encoderType: encoderType, decoderType: decoderType,
maxTgtSntSize: opts.MaxSentLength, enableCoverageModel: opts.EnableCoverageModel);
}
// Add event handler for monitoring
ss.IterationDone += ss_IterationDone;
// Kick off training
ss.Train(maxTrainingEpoch: opts.MaxEpochNum, trainCorpus: trainCorpus, validCorpus: validCorpus, learningRate: learningRate, optimizer: optimizer, metrics: metrics);
}
else if (mode == ModeEnums.Valid)
{
Logger.WriteLine($"Evaluate model '{opts.ModelFilePath}' by valid corpus '{opts.ValidCorpusPath}'");
// Create metrics
List <IMetric> metrics = new List <IMetric>
{
new BleuMetric(),
new LengthRatioMetric()
};
// Load valid corpus
ParallelCorpus validCorpus = new ParallelCorpus(opts.ValidCorpusPath, opts.SrcLang, opts.TgtLang, opts.BatchSize, opts.ShuffleBlockSize, opts.MaxSentLength);
ss = new AttentionSeq2Seq(modelFilePath: opts.ModelFilePath, processorType: processorType, deviceIds: deviceIds);
ss.Valid(validCorpus: validCorpus, metrics: metrics);
}
else if (mode == ModeEnums.Test)
{
Logger.WriteLine($"Test model '{opts.ModelFilePath}' by input corpus '{opts.InputTestFile}'");
//Test trained model
ss = new AttentionSeq2Seq(modelFilePath: opts.ModelFilePath, processorType: processorType, deviceIds: deviceIds);
List <string> outputLines = new List <string>();
string[] data_sents_raw1 = File.ReadAllLines(opts.InputTestFile);
foreach (string line in data_sents_raw1)
{
if (opts.BeamSearch > 1)
{
// Below support beam search
List <List <string> > outputWordsList = ss.Predict(line.ToLower().Trim().Split(' ').ToList(), opts.BeamSearch);
outputLines.AddRange(outputWordsList.Select(x => string.Join(" ", x)));
}
else
{
var outputTokensBatch = ss.Test(ParallelCorpus.ConstructInputTokens(line.ToLower().Trim().Split(' ').ToList()));
outputLines.AddRange(outputTokensBatch.Select(x => String.Join(" ", x)));
}
}
File.WriteAllLines(opts.OutputTestFile, outputLines);
}
else if (mode == ModeEnums.VisualizeNetwork)
{
ss = new AttentionSeq2Seq(embeddingDim: opts.WordVectorSize, hiddenDim: opts.HiddenSize, encoderLayerDepth: opts.EncoderLayerDepth, decoderLayerDepth: opts.DecoderLayerDepth,
vocab: new Vocab(), srcEmbeddingFilePath: null, tgtEmbeddingFilePath: null, modelFilePath: opts.ModelFilePath, dropoutRatio: opts.DropoutRatio,
processorType: processorType, deviceIds: new int[1] {
0
}, multiHeadNum: opts.MultiHeadNum, encoderType: encoderType, decoderType: decoderType, enableCoverageModel: opts.EnableCoverageModel);
ss.VisualizeNeuralNetwork(opts.VisualizeNNFilePath);
}
else if (mode == ModeEnums.DumpVocab)
{
ss = new AttentionSeq2Seq(modelFilePath: opts.ModelFilePath, processorType: processorType, deviceIds: deviceIds);
ss.DumpVocabToFiles(opts.SrcVocab, opts.TgtVocab);
}
else
{
argParser.Usage();
}
}
/// <summary>
/// Given input sentence and generate output sentence by seq2seq model with beam search
/// </summary>
/// <param name="input"></param>
/// <param name="beamSearchSize"></param>
/// <param name="maxOutputLength"></param>
/// <returns></returns>
public List <List <string> > Predict(List <string> input, int beamSearchSize = 1, int maxOutputLength = 100)
{
(IEncoder encoder, IDecoder decoder, IWeightTensor srcEmbedding, IWeightTensor tgtEmbedding, IWeightTensor posEmbedding) = GetNetworksOnDeviceAt(-1);
List <List <string> > inputSeqs = ParallelCorpus.ConstructInputTokens(input);
int batchSize = 1; // For predict with beam search, we currently only supports one sentence per call
IComputeGraph g = CreateComputGraph(m_defaultDeviceId, needBack: false);
AttentionDecoder rnnDecoder = decoder as AttentionDecoder;
encoder.Reset(g.GetWeightFactory(), batchSize);
rnnDecoder.Reset(g.GetWeightFactory(), batchSize);
// Construct beam search status list
List <BeamSearchStatus> bssList = new List <BeamSearchStatus>();
BeamSearchStatus bss = new BeamSearchStatus();
bss.OutputIds.Add((int)SENTTAGS.START);
bss.CTs = rnnDecoder.GetCTs();
bss.HTs = rnnDecoder.GetHTs();
bssList.Add(bss);
IWeightTensor encodedWeightMatrix = Encode(g, inputSeqs, encoder, srcEmbedding, null, posEmbedding, null);
AttentionPreProcessResult attPreProcessResult = rnnDecoder.PreProcess(encodedWeightMatrix, batchSize, g);
List <BeamSearchStatus> newBSSList = new List <BeamSearchStatus>();
bool finished = false;
int outputLength = 0;
while (finished == false && outputLength < maxOutputLength)
{
finished = true;
for (int i = 0; i < bssList.Count; i++)
{
bss = bssList[i];
if (bss.OutputIds[bss.OutputIds.Count - 1] == (int)SENTTAGS.END)
{
newBSSList.Add(bss);
}
else if (bss.OutputIds.Count > maxOutputLength)
{
newBSSList.Add(bss);
}
else
{
finished = false;
int ix_input = bss.OutputIds[bss.OutputIds.Count - 1];
rnnDecoder.SetCTs(bss.CTs);
rnnDecoder.SetHTs(bss.HTs);
IWeightTensor x = g.PeekRow(tgtEmbedding, ix_input);
IWeightTensor eOutput = rnnDecoder.Decode(x, attPreProcessResult, batchSize, g);
using (IWeightTensor probs = g.Softmax(eOutput))
{
List <int> preds = probs.GetTopNMaxWeightIdx(beamSearchSize);
for (int j = 0; j < preds.Count; j++)
{
BeamSearchStatus newBSS = new BeamSearchStatus();
newBSS.OutputIds.AddRange(bss.OutputIds);
newBSS.OutputIds.Add(preds[j]);
newBSS.CTs = rnnDecoder.GetCTs();
newBSS.HTs = rnnDecoder.GetHTs();
float score = probs.GetWeightAt(preds[j]);
newBSS.Score = bss.Score;
newBSS.Score += (float)(-Math.Log(score));
//var lengthPenalty = Math.Pow((5.0f + newBSS.OutputIds.Count) / 6, 0.6);
//newBSS.Score /= (float)lengthPenalty;
newBSSList.Add(newBSS);
}
}
}
}
bssList = BeamSearch.GetTopNBSS(newBSSList, beamSearchSize);
newBSSList.Clear();
outputLength++;
}
// Convert output target word ids to real string
List <List <string> > results = new List <List <string> >();
for (int i = 0; i < bssList.Count; i++)
{
results.Add(m_modelMetaData.Vocab.ConvertTargetIdsToString(bssList[i].OutputIds));
}
return(results);
}
/// <summary>
/// Decode output sentences in training
/// </summary>
/// <param name="outputSnts">In training mode, they are golden target sentences, otherwise, they are target sentences generated by the decoder</param>
/// <param name="g"></param>
/// <param name="encOutputs"></param>
/// <param name="decoder"></param>
/// <param name="decoderFFLayer"></param>
/// <param name="tgtEmbedding"></param>
/// <returns></returns>
private float DecodeAttentionLSTM(List <List <string> > outputSnts, IComputeGraph g, IWeightTensor encOutputs, AttentionDecoder decoder, IWeightTensor tgtEmbedding, int batchSize, bool isTraining = true)
{
float cost = 0.0f;
int[] ix_inputs = new int[batchSize];
for (int i = 0; i < ix_inputs.Length; i++)
{
ix_inputs[i] = m_modelMetaData.Vocab.GetTargetWordIndex(outputSnts[i][0]);
}
// Initialize variables accoridng to current mode
List <int> originalOutputLengths = isTraining ? ParallelCorpus.PadSentences(outputSnts) : null;
int seqLen = isTraining ? outputSnts[0].Count : 64;
float dropoutRatio = isTraining ? m_dropoutRatio : 0.0f;
HashSet <int> setEndSentId = isTraining ? null : new HashSet <int>();
// Pre-process for attention model
AttentionPreProcessResult attPreProcessResult = decoder.PreProcess(encOutputs, batchSize, g);
for (int i = 1; i < seqLen; i++)
{
//Get embedding for all sentence in the batch at position i
List <IWeightTensor> inputs = new List <IWeightTensor>();
for (int j = 0; j < batchSize; j++)
{
inputs.Add(g.PeekRow(tgtEmbedding, ix_inputs[j]));
}
IWeightTensor inputsM = g.ConcatRows(inputs);
//Decode output sentence at position i
IWeightTensor eOutput = decoder.Decode(inputsM, attPreProcessResult, batchSize, g);
//Softmax for output
using (IWeightTensor probs = g.Softmax(eOutput, runGradients: false, inPlace: true))
{
if (isTraining)
{
//Calculate loss for each word in the batch
for (int k = 0; k < batchSize; k++)
{
using (IWeightTensor probs_k = g.PeekRow(probs, k, runGradients: false))
{
int ix_targets_k = m_modelMetaData.Vocab.GetTargetWordIndex(outputSnts[k][i]);
float score_k = probs_k.GetWeightAt(ix_targets_k);
if (i < originalOutputLengths[k])
{
var lcost = (float)-Math.Log(score_k);
if (float.IsNaN(lcost))
{
throw new ArithmeticException($"Score = '{score_k}' Cost = Nan at index '{i}' word '{outputSnts[k][i]}', Output Sentence = '{String.Join(" ", outputSnts[k])}'");
}
else
{
cost += lcost;
}
}
probs_k.SetWeightAt(score_k - 1, ix_targets_k);
ix_inputs[k] = ix_targets_k;
}
}
eOutput.CopyWeightsToGradients(probs);
}
//if (isTraining)
//{
// //Calculate loss for each word in the batch
// int[] targetIds = new int[batchSize];
// int ids = 0;
// for (int k = 0; k < batchSize; k++)
// {
// int targetsId_k = m_modelMetaData.Vocab.GetTargetWordIndex(outputSnts[k][i]);
// targetIds[ids] = i < originalOutputLengths[k] ? targetsId_k : -1;
// ix_inputs[k] = targetsId_k;
// ids++;
// }
// cost += g.UpdateCost(probs, targetIds);
// eOutput.CopyWeightsToGradients(probs);
//}
else
{
// Output "i"th target word
int[] targetIdx = g.Argmax(probs, 1);
List <string> targetWords = m_modelMetaData.Vocab.ConvertTargetIdsToString(targetIdx.ToList());
for (int j = 0; j < targetWords.Count; j++)
{
if (setEndSentId.Contains(j) == false)
{
outputSnts[j].Add(targetWords[j]);
if (targetWords[j] == ParallelCorpus.EOS)
{
setEndSentId.Add(j);
}
}
}
if (setEndSentId.Count == batchSize)
{
// All target sentences in current batch are finished, so we exit.
break;
}
ix_inputs = targetIdx;
}
}
}
return(cost);
}
private float DecodeTransformer(List <List <string> > tgtSeqs, IComputeGraph g, IWeightTensor encOutputs, TransformerDecoder decoder,
IWeightTensor tgtEmbedding, IWeightTensor posEmbedding, int batchSize, int deviceId, List <int> srcOriginalLenghts, bool isTraining = true)
{
float cost = 0.0f;
var tgtOriginalLengths = ParallelCorpus.PadSentences(tgtSeqs);
int tgtSeqLen = tgtSeqs[0].Count;
int srcSeqLen = encOutputs.Rows / batchSize;
using (IWeightTensor srcTgtMask = MaskUtils.BuildSrcTgtMask(g, srcSeqLen, tgtSeqLen, tgtOriginalLengths, srcOriginalLenghts, deviceId))
{
using (IWeightTensor tgtSelfTriMask = MaskUtils.BuildPadSelfTriMask(g, tgtSeqLen, tgtOriginalLengths, deviceId))
{
List <IWeightTensor> inputs = new List <IWeightTensor>();
for (int i = 0; i < batchSize; i++)
{
for (int j = 0; j < tgtSeqLen; j++)
{
int ix_targets_k = m_modelMetaData.Vocab.GetTargetWordIndex(tgtSeqs[i][j], logUnk: true);
var emb = g.PeekRow(tgtEmbedding, ix_targets_k, runGradients: j < tgtOriginalLengths[i] ? true : false);
inputs.Add(emb);
}
}
IWeightTensor inputEmbs = inputs.Count > 1 ? g.ConcatRows(inputs) : inputs[0];
inputEmbs = AddPositionEmbedding(g, posEmbedding, batchSize, tgtSeqLen, inputEmbs);
IWeightTensor decOutput = decoder.Decode(inputEmbs, encOutputs, tgtSelfTriMask, srcTgtMask, batchSize, g);
using (IWeightTensor probs = g.Softmax(decOutput, runGradients: false, inPlace: true))
{
if (isTraining)
{
var leftShiftInputSeqs = ParallelCorpus.LeftShiftSnts(tgtSeqs, ParallelCorpus.EOS);
for (int i = 0; i < batchSize; i++)
{
for (int j = 0; j < tgtSeqLen; j++)
{
using (IWeightTensor probs_i_j = g.PeekRow(probs, i * tgtSeqLen + j, runGradients: false))
{
if (j < tgtOriginalLengths[i])
{
int ix_targets_i_j = m_modelMetaData.Vocab.GetTargetWordIndex(leftShiftInputSeqs[i][j], logUnk: true);
float score_i_j = probs_i_j.GetWeightAt(ix_targets_i_j);
cost += (float)-Math.Log(score_i_j);
probs_i_j.SetWeightAt(score_i_j - 1, ix_targets_i_j);
}
else
{
probs_i_j.CleanWeight();
}
}
}
}
decOutput.CopyWeightsToGradients(probs);
}
//if (isTraining)
//{
// var leftShiftInputSeqs = ParallelCorpus.LeftShiftSnts(tgtSeqs, ParallelCorpus.EOS);
// int[] targetIds = new int[batchSize * tgtSeqLen];
// int ids = 0;
// for (int i = 0; i < batchSize; i++)
// {
// for (int j = 0; j < tgtSeqLen; j++)
// {
// targetIds[ids] = j < tgtOriginalLengths[i] ? m_modelMetaData.Vocab.GetTargetWordIndex(leftShiftInputSeqs[i][j], logUnk: true) : -1;
// ids++;
// }
// }
// cost += g.UpdateCost(probs, targetIds);
// decOutput.CopyWeightsToGradients(probs);
//}
else
{
// Output "i"th target word
int[] targetIdx = g.Argmax(probs, 1);
List <string> targetWords = m_modelMetaData.Vocab.ConvertTargetIdsToString(targetIdx.ToList());
for (int i = 0; i < batchSize; i++)
{
tgtSeqs[i].Add(targetWords[i * tgtSeqLen + tgtSeqLen - 1]);
}
}
}
}
}
return(cost);
}
/// <summary>
/// Run forward part on given single device
/// </summary>
/// <param name="computeGraph">The computing graph for current device. It gets created and passed by the framework</param>
/// <param name="srcSnts">A batch of input tokenized sentences in source side</param>
/// <param name="tgtSnts">A batch of output tokenized sentences in target side</param>
/// <param name="deviceIdIdx">The index of current device</param>
/// <returns>The cost of forward part</returns>
private float RunForwardOnSingleDevice(IComputeGraph computeGraph, List <List <string> > srcSnts, List <List <string> > tgtSnts, int deviceIdIdx, bool isTraining)
{
(IEncoder encoder, IDecoder decoder, IWeightTensor srcEmbedding, IWeightTensor tgtEmbedding, IWeightTensor posEmbedding) = GetNetworksOnDeviceAt(deviceIdIdx);
// Reset networks
encoder.Reset(computeGraph.GetWeightFactory(), srcSnts.Count);
decoder.Reset(computeGraph.GetWeightFactory(), srcSnts.Count);
List <int> originalSrcLengths = ParallelCorpus.PadSentences(srcSnts);
int srcSeqPaddedLen = srcSnts[0].Count;
int batchSize = srcSnts.Count;
IWeightTensor srcSelfMask = m_shuffleType == ShuffleEnums.NoPaddingInSrc ? null : MaskUtils.BuildPadSelfMask(computeGraph, srcSeqPaddedLen, originalSrcLengths, DeviceIds[deviceIdIdx]); // The length of source sentences are same in a single mini-batch, so we don't have source mask.
// Encoding input source sentences
IWeightTensor encOutput = Encode(computeGraph, srcSnts, encoder, srcEmbedding, srcSelfMask, posEmbedding, originalSrcLengths);
if (srcSelfMask != null)
{
srcSelfMask.Dispose();
}
// Generate output decoder sentences
if (decoder is AttentionDecoder)
{
return(DecodeAttentionLSTM(tgtSnts, computeGraph, encOutput, decoder as AttentionDecoder, tgtEmbedding, srcSnts.Count, isTraining));
}
else
{
if (isTraining)
{
return(DecodeTransformer(tgtSnts, computeGraph, encOutput, decoder as TransformerDecoder, tgtEmbedding, posEmbedding, batchSize, DeviceIds[deviceIdIdx], originalSrcLengths, isTraining));
}
else
{
for (int i = 0; i < m_maxTgtSntSize; i++)
{
using (var g = computeGraph.CreateSubGraph($"TransformerDecoder_Step_{i}"))
{
DecodeTransformer(tgtSnts, g, encOutput, decoder as TransformerDecoder, tgtEmbedding, posEmbedding, batchSize, DeviceIds[deviceIdIdx], originalSrcLengths, isTraining);
bool allSntsEnd = true;
for (int j = 0; j < tgtSnts.Count; j++)
{
if (tgtSnts[j][tgtSnts[j].Count - 1] != ParallelCorpus.EOS)
{
allSntsEnd = false;
break;
}
}
if (allSntsEnd)
{
break;
}
}
}
RemoveDuplicatedEOS(tgtSnts);
return(0.0f);
}
}
}
private static void Main(string[] args)
{
ShowOptions(args);
Logger.LogFile = $"{nameof(SeqLabelConsole)}_{GetTimeStamp(DateTime.Now)}.log";
//Parse command line
var opts = new Options();
var argParser = new ArgParser(args, opts);
if (string.IsNullOrEmpty(opts.ConfigFilePath) == false)
{
Logger.WriteLine($"Loading config file from '{opts.ConfigFilePath}'");
opts = JsonConvert.DeserializeObject <Options>(File.ReadAllText(opts.ConfigFilePath));
}
SequenceLabel sl = null;
var processorType = (ProcessorTypeEnums)Enum.Parse(typeof(ProcessorTypeEnums), opts.ProcessorType);
var encoderType = (EncoderTypeEnums)Enum.Parse(typeof(EncoderTypeEnums), opts.EncoderType);
var mode = (ModeEnums)Enum.Parse(typeof(ModeEnums), opts.TaskName);
//Parse device ids from options
var deviceIds = opts.DeviceIds.Split(',').Select(int.Parse).ToArray();
if (mode == ModeEnums.Train)
{
// Load train corpus
var trainCorpus = new SequenceLabelingCorpus(opts.TrainCorpusPath, opts.BatchSize, opts.ShuffleBlockSize, opts.MaxSentLength);
// Load valid corpus
var validCorpus = string.IsNullOrEmpty(opts.ValidCorpusPath) ? null : new SequenceLabelingCorpus(opts.ValidCorpusPath, opts.BatchSize, opts.ShuffleBlockSize, opts.MaxSentLength);
// Load or build vocabulary
Vocab vocab = null;
if (!string.IsNullOrEmpty(opts.SrcVocab) && !string.IsNullOrEmpty(opts.TgtVocab))
{
// Vocabulary files are specified, so we load them
vocab = new Vocab(opts.SrcVocab, opts.TgtVocab);
}
else
{
// We don't specify vocabulary, so we build it from train corpus
vocab = new Vocab(trainCorpus);
}
// Create learning rate
ILearningRate learningRate = new DecayLearningRate(opts.StartLearningRate, opts.WarmUpSteps, opts.WeightsUpdateCount);
// Create optimizer
var optimizer = new AdamOptimizer(opts.GradClip, opts.Beta1, opts.Beta2);
// Create metrics
var metrics = new List <IMetric>();
foreach (var word in vocab.TgtVocab)
{
metrics.Add(new SequenceLabelFscoreMetric(word));
}
if (File.Exists(opts.ModelFilePath) == false)
{
//New training
sl = new SequenceLabel(opts.HiddenSize, opts.WordVectorSize, opts.EncoderLayerDepth, opts.MultiHeadNum,
encoderType,
opts.DropoutRatio, deviceIds: deviceIds, processorType: processorType, modelFilePath: opts.ModelFilePath, vocab: vocab, maxSntSize: opts.MaxSentLength);
}
else
{
//Incremental training
Logger.WriteLine($"Loading model from '{opts.ModelFilePath}'...");
sl = new SequenceLabel(opts.ModelFilePath, processorType, deviceIds, opts.DropoutRatio, opts.MaxSentLength);
}
// Add event handler for monitoring
sl.IterationDone += ss_IterationDone;
// Kick off training
sl.Train(opts.MaxEpochNum, trainCorpus, validCorpus, learningRate, optimizer: optimizer, metrics: metrics);
}
else if (mode == ModeEnums.Valid)
{
Logger.WriteLine($"Evaluate model '{opts.ModelFilePath}' by valid corpus '{opts.ValidCorpusPath}'");
// Load valid corpus
var validCorpus = new SequenceLabelingCorpus(opts.ValidCorpusPath, opts.BatchSize, opts.ShuffleBlockSize, opts.MaxSentLength);
var vocab = new Vocab(validCorpus);
// Create metrics
var metrics = new List <IMetric>();
foreach (var word in vocab.TgtVocab)
{
metrics.Add(new SequenceLabelFscoreMetric(word));
}
sl = new SequenceLabel(opts.ModelFilePath, processorType, deviceIds, maxSntSize: opts.MaxSentLength);
sl.Valid(validCorpus, metrics);
}
else if (mode == ModeEnums.Test)
{
Logger.WriteLine($"Test model '{opts.ModelFilePath}' by input corpus '{opts.InputTestFile}'");
//Test trained model
sl = new SequenceLabel(opts.ModelFilePath, processorType, deviceIds, maxSntSize: opts.MaxSentLength);
var outputLines = new List <string>();
var data_sents_raw1 = File.ReadAllLines(opts.InputTestFile);
foreach (var line in data_sents_raw1)
{
var outputTokensBatch = sl.Test(ParallelCorpus.ConstructInputTokens(line.ToLower().Trim().Split(' ').ToList(), false));
outputLines.AddRange(outputTokensBatch.Select(x => string.Join(" ", x)));
}
File.WriteAllLines(opts.OutputTestFile, outputLines);
}
else
{
argParser.Usage();
}
}