public int Recognize(ISoundSignalReader signal, HiddenMarkovClassifier hmm, out string name,
SignalVisitor voiceVisitor = null)
{
var featureUtility = new FeatureUtility(_engineParameters);
signal.Reset();
var features = featureUtility.ExtractFeatures(signal, voiceVisitor).First();
var observations = _codeBook.Quantize(features.Select(item => new Point(item)).ToArray());
double[] responsabilities;
var ret = hmm.Compute(observations, out responsabilities);
var models = hmm.Models;
var likelyHoodValue = Double.MinValue;
name = string.Empty;
foreach (var model in models)
{
var val = model.Evaluate(observations);
if (val > likelyHoodValue)
{
likelyHoodValue = val;
name = model.Tag.ToString();
}
}
return ret;
}
public int Recognize(ISoundSignalReader signal, HiddenMarkovModel[] models, out string name,
SignalVisitor voiceVisitor = null)
{
var featureUtility = new FeatureUtility(_engineParameters);
signal.Reset();
var features = featureUtility.ExtractFeatures(signal, voiceVisitor).First();
var observations = _codeBook.Quantize(features.Select(item => new Point(item)).ToArray());
var likelyHoodValue = Double.MinValue;
name = string.Empty;
var index = 0;
var ret = 0;
foreach (var model in models)
{
var val = model.Evaluate(observations);
if (val > likelyHoodValue)
{
likelyHoodValue = val;
name = model.Tag.ToString();
ret = index;
}
index++;
}
return ret;
}
public HiddenMarkovModel BuildModel(IList<ISoundSignalReader> signalReaders, string tag,
SignalVisitor visitor = null)
{
var signals = signalReaders; // signals
var signalsCount = signals.Count();
List<List<double[]>> samples = new List<List<double[]>>();
var featureUtility = new FeatureUtility(_engineParameters);
var meanFeaturesLength = 0.0;
for (var signalIndex = 0; signalIndex < signalsCount; signalIndex++)
{
var signal = signals[signalIndex];
signal.Reset();
var allSignalfeatures = featureUtility.ExtractFeatures(signal, visitor).ToArray();
samples.AddRange(allSignalfeatures);
}
var featuresInput = new double[samples.Count][][];
for (var index = 0; index < samples.Count; index++)
{
featuresInput[index] = samples[index].ToArray();
meanFeaturesLength += featuresInput[index].Length;
}
meanFeaturesLength = meanFeaturesLength/samples.Count;
var hmm = new HiddenMarkovModel(_numberOfHiddenStates, _codeBook.Size, false);
List<int[]> observables = new List<int[]>();
for (var signalIndex = 0; signalIndex < featuresInput.Length; signalIndex++) // foreach word signal
{
var points = featuresInput[signalIndex].Select(item => new Point(item)); // convert feature to points
var codeItems = _codeBook.Quantize(points.ToArray());
observables.Add(codeItems);
}
const int iterations = 20000;
const double tolerance = 0.0;
var viterbiLearning = new ViterbiLearning(hmm) {Iterations = iterations, Tolerance = tolerance};
viterbiLearning.Run(observables.ToArray());
var idProp = new IdentificationProperties
{
Class = ClassType.Word,
MeanFeaturesLength = meanFeaturesLength,
Label = tag
};
viterbiLearning.Model.Tag = idProp;
_models[tag] = viterbiLearning.Model;
return viterbiLearning.Model;
}
public static Codebook FromWaves(IList<ISoundSignalReader> sounds, EngineParameters parameters, int codeBookSize = 256)
{
var featureUtility = new FeatureUtility(parameters);
var features = new List<double[][]>();
foreach (var signal in sounds)
{
signal.Reset();
var items = featureUtility.ExtractFeatures(signal).Select(item => item.ToArray());
features.AddRange(items);
}
var codeBook = new Codebook(features.SelectMany(item => item).Select(item => new Point(item)).ToArray(), codeBookSize);
return codeBook;
}
public void RecognizeAsync(ISoundSignalReader signal, HiddenMarkovClassifier hmm, Action<string> handleMessage,
SignalVisitor voiceVisitor = null)
{
Action<List<double[]>> action = features =>
{
var observations = _codeBook.Quantize(features.Select(item => new Point(item)).ToArray());
double[] responsabilities;
var ret = hmm.Compute(observations, out responsabilities);
var models = hmm.Models;
var likelyHoodValue = Double.MinValue;
foreach (var model in models)
{
var val = model.Evaluate(observations);
if (val > likelyHoodValue)
{
likelyHoodValue = val;
}
}
handleMessage(hmm[ret].Tag.ToString());
};
var featureUtility = new FeatureUtility(_engineParameters);
featureUtility.ExtractFeaturesAsync(signal, action, voiceVisitor);
}
public TrainResult TrainAll(Dictionary<string, IList<ISoundSignalReader>> signalsDictionary,
SignalVisitor voiceVisitor = null)
{
var numberOfItems = 0;
foreach (var item in signalsDictionary)
{
numberOfItems += item.Value.Count;
}
double[][][][] featuresInput = new Double[signalsDictionary.Count][][][];
int[] models = new int[numberOfItems];
var allSignalIndex = 0;
var modelIndex = 0;
var featureUtility = new FeatureUtility(_engineParameters);
foreach (var item in signalsDictionary)
{
var signals = item.Value; // signals
var signalsCount = signals.Count();
featuresInput[modelIndex] = new double[signalsCount][][];
for (var signalIndex = 0; signalIndex < signalsCount; signalIndex++)
{
var signal = signals[signalIndex];
List<Double[]> features = featureUtility.ExtractFeatures(signal, voiceVisitor).First();
featuresInput[modelIndex][signalIndex] = features.ToArray();
models[allSignalIndex] = modelIndex;
allSignalIndex++;
}
modelIndex++;
}
List<int[]> observables = new List<int[]>();
for (int wordIndex = 0; wordIndex < featuresInput.Length; wordIndex++) // foreach word
{
for (var signalIndex = 0; signalIndex < featuresInput[wordIndex].Length; signalIndex++)
// foreach word signal
{
var points = featuresInput[wordIndex][signalIndex].Select(item => new Point(item));
// convert feature to points
var codeItems = _codeBook.Quantize(points.ToArray());
observables.Add(codeItems);
}
}
//HiddenMarkovModel hmm = new HiddenMarkovModel(5, _codeBook.Size, true);
//var Bauc
var hmm = new HiddenMarkovClassifier(signalsDictionary.Count, new Forward(_numberOfHiddenStates),
_codeBook.Size, signalsDictionary.Keys.ToArray());
const int iterations = 200;
const double tolerance = 0;
var teacher = new HiddenMarkovClassifierLearning(hmm,
i => new ViterbiLearning(hmm.Models[i]) {Iterations = iterations, Tolerance = tolerance}
);
teacher.Run(observables.ToArray(), models);
return new TrainResult {Catalog = _codeBook, Models = hmm.Models.ToArray()};
}
public void RecognizeAsync(ISoundSignalReader signal, Action<string> handleMessage,
SignalVisitor visitor = null)
{
Action<List<double[]>> action = features =>
{
var observations = _codeBook.Quantize(features.Select(item => new Point(item)).ToArray());
var likelyHoodValue = Double.MinValue;
HiddenMarkovModel bestFit = null;
var modelsToSearchFor = _models.Values.Where(item =>
{
var idProp = (IdentificationProperties) item.Tag;
var rateLength = Math.Abs(idProp.MeanFeaturesLength - observations.Length)/idProp.MeanFeaturesLength;
return rateLength < 0.1;
}).ToArray();
foreach (var model in modelsToSearchFor)
{
var val = model.Evaluate(observations);
if (val > likelyHoodValue)
{
likelyHoodValue = val;
bestFit = model;
}
}
if (bestFit != null)
{
var idProp = (IdentificationProperties)bestFit.Tag;
handleMessage(idProp.Label);
}
};
var featureUtility = new FeatureUtility(_engineParameters);
featureUtility.ExtractFeaturesAsync(signal, action, visitor);
}
public int Recognize(ISoundSignalReader signal, out string name,
SignalVisitor visitor = null)
{
var featureUtility = new FeatureUtility(_engineParameters);
signal.Reset();
var features = featureUtility.ExtractFeatures(signal, visitor).First();
var observations = _codeBook.Quantize(features.Select(item => new Point(item)).ToArray());
var likelyHoodValue = Double.MinValue;
HiddenMarkovModel bestFit = null;
var index = 0;
var ret = 0;
foreach (var model in _models.Values)
{
var val = model.Evaluate(observations);
if (val > likelyHoodValue)
{
likelyHoodValue = val;
bestFit = model;
ret = index;
}
index++;
}
if (bestFit != null)
{
var idProp = (IdentificationProperties) bestFit.Tag;
name = idProp.Label;
}
else
name = string.Empty;
return ret;
}
