static void ManyToOne()
{
var grammar = new SequenceGenerator(dictionarySize: 16, minSize: 3, maxSize: 6, noRepeat: true, isStochastic: false);
var sequences = grammar.GenerateSequences().Take(1000).ToList();
var builder = BrightWireProvider.CreateDataTableBuilder();
builder.AddColumn(ColumnType.Matrix, "Sequence");
builder.AddColumn(ColumnType.Vector, "Summary");
foreach (var sequence in sequences)
{
var list = new List <FloatVector>();
var charSet = new HashSet <char>();
foreach (var ch in sequence)
{
charSet.Add(ch);
list.Add(grammar.Encode(ch));
}
var target = grammar.Encode(charSet.Select(ch2 => (ch2, 1f)));
builder.Add(FloatMatrix.Create(list.ToArray()), target);
}
var data = builder.Build().Split(0);
using (var lap = BrightWireProvider.CreateLinearAlgebra(false)) {
var graph = new GraphFactory(lap);
var errorMetric = graph.ErrorMetric.BinaryClassification;
// create the property set
var propertySet = graph.CurrentPropertySet
.Use(graph.GradientDescent.RmsProp)
.Use(graph.WeightInitialisation.Xavier)
;
// create the engine
var trainingData = graph.CreateDataSource(data.Training);
var testData = trainingData.CloneWith(data.Test);
var engine = graph.CreateTrainingEngine(trainingData, 0.03f, 8);
// build the network
const int HIDDEN_LAYER_SIZE = 128;
var memory = new float[HIDDEN_LAYER_SIZE];
var network = graph.Connect(engine)
.AddGru(memory)
//.AddSimpleRecurrent(graph.ReluActivation(), memory)
.AddFeedForward(engine.DataSource.OutputSize)
.Add(graph.SigmoidActivation())
.AddBackpropagationThroughTime(errorMetric)
;
engine.Train(20, testData, errorMetric);
var networkGraph = engine.Graph;
var executionEngine = graph.CreateEngine(networkGraph);
var output = executionEngine.Execute(testData);
Console.WriteLine(output.Where(o => o.Target != null).Average(o => o.CalculateError(errorMetric)));
}
}
static void OneToMany()
{
var grammar = new SequenceGenerator(dictionarySize: 10, minSize: 5, maxSize: 5,
noRepeat: true, isStochastic: false);
var sequences = grammar.GenerateSequences().Take(1000).ToList();
var builder = BrightWireProvider.CreateDataTableBuilder();
builder.AddColumn(ColumnType.Vector, "Summary");
builder.AddColumn(ColumnType.Matrix, "Sequence");
foreach (var sequence in sequences)
{
var sequenceData = sequence.GroupBy(ch => ch).Select(g => (g.Key, g.Count())).
ToDictionary(d => d.Item1, d => (float)d.Item2);
var summary = grammar.Encode(sequenceData.Select(kv => (kv.Key, kv.Value)));
var list = new List <FloatVector>();
foreach (var item in sequenceData.OrderBy(kv => kv.Key))
{
var row = grammar.Encode(item.Key, item.Value);
list.Add(row);
}
builder.Add(summary, FloatMatrix.Create(list.ToArray()));
}
var data = builder.Build().Split(0);
using var lap = BrightWireProvider.CreateLinearAlgebra(false);
var graph = new GraphFactory(lap);
var errorMetric = graph.ErrorMetric.BinaryClassification;
// create the property set
var propertySet = graph.CurrentPropertySet.Use(graph.GradientDescent.RmsProp).
Use(graph.WeightInitialisation.Xavier);
// create the engine
const float TRAINING_RATE = 0.1f;
var trainingData = graph.CreateDataSource(data.Training);
var testData = trainingData.CloneWith(data.Test);
var engine = graph.CreateTrainingEngine(trainingData, TRAINING_RATE, 8);
engine.LearningContext.ScheduleLearningRate(30, TRAINING_RATE / 3);
// build the network
const int HIDDEN_LAYER_SIZE = 128;
graph.Connect(engine).AddLstm(HIDDEN_LAYER_SIZE).AddFeedForward(engine.DataSource.OutputSize).
Add(graph.SigmoidActivation()).AddBackpropagation(errorMetric);
engine.Train(40, testData, errorMetric);
var networkGraph = engine.Graph;
var executionEngine = graph.CreateEngine(networkGraph);
var output = executionEngine.Execute(testData);
Console.WriteLine(output.Average(o => o.CalculateError(errorMetric)));
}
static void SequenceToSequence()
{
const int SEQUENCE_LENGTH = 5;
var grammar = new SequenceGenerator(8, SEQUENCE_LENGTH, SEQUENCE_LENGTH, true, false);
var sequences = grammar.GenerateSequences().Take(2000).ToList();
var builder = BrightWireProvider.CreateDataTableBuilder();
builder.AddColumn(ColumnType.Matrix, "Input");
builder.AddColumn(ColumnType.Matrix, "Output");
foreach (var sequence in sequences)
{
var encodedSequence = grammar.Encode(sequence);
var reversedSequence = new FloatMatrix
{
Row = encodedSequence.Row.Reverse().Take(SEQUENCE_LENGTH - 1).ToArray()
};
builder.Add(encodedSequence, reversedSequence);
}
var data = builder.Build().Split(0);
using var lap = BrightWireProvider.CreateLinearAlgebra();
var graph = new GraphFactory(lap);
var errorMetric = graph.ErrorMetric.BinaryClassification;
// create the property set
var propertySet = graph.CurrentPropertySet.Use(graph.GradientDescent.RmsProp).
Use(graph.WeightInitialisation.Xavier);
const int BATCH_SIZE = 16;
int HIDDEN_LAYER_SIZE = 64;
const float TRAINING_RATE = 0.1f;
// create the encoder
var encoderLearningContext = graph.CreateLearningContext(TRAINING_RATE, BATCH_SIZE,
TrainingErrorCalculation.Fast, true);
var trainingData = graph.CreateDataSource(data.Training, encoderLearningContext,
wb => wb.AddLstm(HIDDEN_LAYER_SIZE, "encoder").
WriteNodeMemoryToSlot("shared-memory", wb.Find("encoder") as IHaveMemoryNode).
AddFeedForward(grammar.DictionarySize).Add(graph.SigmoidActivation()).
AddBackpropagationThroughTime(errorMetric));
var testData = trainingData.CloneWith(data.Test);
// create the engine
var engine = graph.CreateTrainingEngine(trainingData, TRAINING_RATE, BATCH_SIZE);
engine.LearningContext.ScheduleLearningRate(30, TRAINING_RATE / 3);
engine.LearningContext.ScheduleLearningRate(40, TRAINING_RATE / 9);
// create the decoder
var wb2 = graph.Connect(engine);
wb2.JoinInputWithMemory("shared-memory").IncrementSizeBy(HIDDEN_LAYER_SIZE).
AddLstm(HIDDEN_LAYER_SIZE, "decoder").AddFeedForward(trainingData.OutputSize).
Add(graph.SigmoidActivation()).AddBackpropagationThroughTime(errorMetric);
engine.Train(50, testData, errorMetric);
//var dataSourceModel = (trainingData as IAdaptiveDataSource).GetModel();
//var testData2 = graph.CreateDataSource(data.Test, dataSourceModel);
//var networkGraph = engine.Graph;
//var executionEngine = graph.CreateEngine(networkGraph);
//var output = executionEngine.Execute(testData2);
//Console.WriteLine(output.Average(o => o.CalculateError(errorMetric)));
}
