public void perceptron_should_learn_all_except_xor_nor(
[ValueSource("Backends")] string backend,
[ValueSource("Targets")] float[] y,
[Values(false, true)] bool useBias)
{
KerasSharp.Backends.Current.Switch(backend);
var model = new Sequential();
model.Add(new Dense(1, input_dim: 2,
kernel_initializer: new GlorotUniform(),
bias_initializer: new GlorotUniform(),
use_bias: useBias,
activation: new Sigmoid()));
model.Compile(loss: new MeanSquareError(), optimizer: new SGD(lr: 1), metrics: new[] { new Accuracy() });
model.fit(x, y, epochs: 1000, batch_size: y.Length);
Array yy = model.predict(x, batch_size: y.Length)[0];
float[] pred = MatrixEx.Round(yy.To <float[, ]>()).GetColumn(0);
if ((useBias && (y == xor)) ||
(!useBias && (y == xor || y == nor || y == and)))
{
Assert.AreNotEqual(y, pred);
}
else
{
Assert.AreEqual(y, pred);
}
}
public void mlp_should_learn_all(
[ValueSource("Backends")] string backend,
[ValueSource("Targets")] float[] y,
[Values(false, true)] bool useBias)
{
KerasSharp.Backends.Current.Switch(backend);
var model = new Sequential();
model.Add(new Dense(5, input_dim: 2,
kernel_initializer: new GlorotUniform(),
bias_initializer: new GlorotUniform(),
use_bias: useBias,
activation: new Sigmoid()));
model.Add(new Dense(1,
kernel_initializer: new GlorotUniform(),
bias_initializer: new GlorotUniform(),
use_bias: useBias,
activation: new Sigmoid()));
model.Compile(loss: new MeanSquareError(), optimizer: new SGD(lr: 1), metrics: new[] { new Accuracy() });
model.fit(x, y, epochs: 1000, batch_size: y.Length);
double[] pred = Matrix.Round(model.predict(x, batch_size: y.Length)[0].To <double[, ]>()).GetColumn(0);
Assert.AreEqual(y, pred);
}
private List <MLFoundPoint> Test(List <Candle> candles)
{
Log.Info("Running test");
try
{
var ret = new List <MLFoundPoint>();
var x = new List <float>();
var xpoints = 0;
for (var i = 20; i < candles.Count; i++)
{
var z = _dataGenerator.GetMLPointXData(candles, i);
if (xpoints == 0)
{
xpoints = z.Count;
}
x.AddRange(z);
}
var inX = np.array(x.ToArray());
var countIn = (int)(x.Count / (decimal)xpoints);
inX = inX.reshape(countIn, xpoints);
var outY = _model.predict(inX, countIn);
for (var i = 0; i < countIn; i++)
{
var values = outY[0][i].ToArray <float>();
if (values.Any(v => v > 1F || v < 0F))
{
throw new ApplicationException("Test values is <0 or >1");
}
var buy = values[0];
var sell = values[1];
if (buy > 0.95F)
{
ret.Add(new MLFoundPoint(candles[i].CloseTimeTicks, TradeDirection.Long, (decimal)candles[i].CloseBid));
}
if (sell > 0.95F)
{
ret.Add(new MLFoundPoint(candles[i].CloseTimeTicks, TradeDirection.Short, (decimal)candles[i].CloseBid));
}
}
Log.Info($"Test complete - {ret.Count} points found");
return(ret);
}
catch (Exception ex)
{
Log.Error("Failing to run test", ex);
return(null);
}
}
static void Main(string[] args)
{
var model = new Sequential();
var dense = new Dense(units: 5, input_dim: 5,
kernel_initializer: new Constant(Matrix.Identity(5)),
bias_initializer: new Constant(0));
model.Add(dense);
float[,] input = Vector.Range(25).Reshape(5, 5).ToSingle();
float[,] output = MatrixEx.To <float[, ]>(model.predict(input)[0]);
}
public void DoSomeWork(double[][] myoData)
{
using (var session = new TFSession())
{
float[,] x = myoData.ToMatrix().ToSingle();
float[] y = myoData.GetColumn(0).ToSingle();
var inputDim = x.GetLength(1);
KerasSharp.Backends.Current.Switch("KerasSharp.Backends.TensorFlowBackend");
// Create the model
var model = new Sequential();
model.Add(new Dense(512, input_dim: inputDim, activation: new ReLU()));
model.Add(new Dense(8, activation: new Softmax()));
// Compile the model (for the moment, only the mean square
// error loss is supported, but this should be solved soon)
model.Compile(loss: new CategoricalCrossEntropy(),
optimizer: new SGD(),
metrics: new[] { new Accuracy() });
// Fit the model for 150 epochs
model.fit(x, y, epochs: 150, batch_size: 32);
// Use the model to make predictions
float[] pred = model.predict(x)[0].To <float[]>();
// Evaluate the model
double[] scores = model.evaluate(x, y);
Console.WriteLine($"{model.metrics_names[1]}: {scores[1] * 100}");
}
/*
* using (var session = new TFSession())
* {
* var graph = session.Graph;
*
* var a = graph.Const(2);
* var b = graph.Const(3);
*
* TFTensor addingTensor = session.GetRunner().Run(graph.Add(a, b));
* object TResVal = addingTensor.GetValue();
*
* }
*/
}
public double act(Array state)
{
Random random = new Random();
if (np.random.rand() < this.exploration_rate)
{
int actionindex = random.Next(0, this.action_space);
return(actionindex);
}
//var model = new Sequential();
Array[] pred = model.predict(state);
return(np.argmax(pred[0]));
}
public void conv_bias(string backend)
{
KerasSharp.Backends.Current.Switch(backend);
var model = new Sequential();
var dense = new Dense(units: 5, input_dim: 5,
kernel_initializer: new Constant(Matrix.Identity(5)),
bias_initializer: new Constant(42));
model.Add(dense);
float[,] input = Vector.Range(25).Reshape(5, 5).ToSingle();
float[,] output = MatrixEx.To <float[, ]>(model.predict(input)[0]);
Assert.IsTrue(input.Add(42).IsEqual(output, 1e-8f));
}
static void Main(string[] args)
{
GradientEngine.UseEnvironmentFromVariable();
TensorFlowSetup.Instance.EnsureInitialized();
// this allows SIREN to oversaturate channels without adding to the loss
var clampToValidChannelRange = PythonFunctionContainer.Of <Tensor, Tensor>(ClampToValidChannelValueRange);
var siren = new Sequential(new object[] {
new GaussianNoise(stddev: 1f / (128 * 1024)),
new Siren(2, Enumerable.Repeat(256, 5).ToArray()),
new Dense(units: 4, activation: clampToValidChannelRange),
new GaussianNoise(stddev: 1f / 128),
});
siren.compile(
// too slow to converge
//optimizer: new SGD(momentum: 0.5),
// lowered learning rate to avoid destabilization
optimizer: new Adam(learning_rate: 0.00032),
loss: "mse");
if (args.Length == 0)
{
siren.load_weights("sample.weights");
Render(siren, 1034 * 3, 1536 * 3, "sample6X.png");
return;
}
foreach (string imagePath in args)
{
using var original = new Bitmap(imagePath);
byte[,,] image = ToBytesHWC(original);
int height = image.GetLength(0);
int width = image.GetLength(1);
int channels = image.GetLength(2);
Debug.Assert(channels == 4);
var imageSamples = PrepareImage(image);
var coords = ImageTools.Coord(height, width).ToNumPyArray()
.reshape(new[] { width *height, 2 });
var upscaleCoords = ImageTools.Coord(height * 2, width * 2).ToNumPyArray();
var improved = ImprovedCallback.Create((sender, eventArgs) => {
if (eventArgs.Epoch < 10)
{
return;
}
ndarray <float> upscaled = siren.predict(
upscaleCoords.reshape(new[] { height *width * 4, 2 }),
batch_size: 1024);
upscaled = (ndarray <float>)upscaled.reshape(new[] { height * 2, width * 2, channels });
using var bitmap = ToImage(RestoreImage(upscaled));
bitmap.Save("sample4X.png", ImageFormat.Png);
siren.save_weights("sample.weights");
Console.WriteLine();
Console.WriteLine("saved!");
});
siren.fit(coords, imageSamples, epochs: 100, batchSize: 16 * 1024,
shuffleMode: TrainingShuffleMode.Epoch,
callbacks: new ICallback[] { improved });
}
}
static void Main(string[] args)
{
/*
# Example from https://machinelearningmastery.com/tutorial-first-neural-network-python-keras/
#
# from keras.models import Sequential
# from keras.layers import Dense
# import numpy
#
# fix random seed for reproducibility
# numpy.random.seed(7)
#
# load pima indians dataset
# dataset = numpy.loadtxt("pima-indians-diabetes.csv", delimiter=",")
# split into input (X) and output (Y) variables
# X = dataset[:,0:8]
# Y = dataset[:,8]
#
# create model
# model = Sequential()
# model.add(Dense(12, input_dim=8, activation='relu'))
# model.add(Dense(8, activation='relu'))
# model.add(Dense(1, activation='sigmoid'))
#
# Compile model
# model.compile(loss='binary_crossentropy', optimizer='adam', metrics=['accuracy'])
#
# Fit the model
# model.fit(X, Y, epochs=150, batch_size=10)
#
# evaluate the model
# scores = model.evaluate(X, Y)
# print("\n%s: %.2f%%" % (model.metrics_names[1], scores[1]*100))
*/
//KerasSharp.Backends.Current.Switch("KerasSharp.Backends.TensorFlowBackend");
KerasSharp.Backends.Current.Switch("KerasSharp.Backends.CNTKBackend");
// Load the Pima Indians Data Set
var pima = new Accord.DataSets.PimaIndiansDiabetes();
float[,] x = pima.Instances.ToMatrix().ToSingle();
float[] y = pima.ClassLabels.ToSingle();
// Create the model
var model = new Sequential();
model.Add(new Dense(12, input_dim: 8, activation: new ReLU()));
model.Add(new Dense(8, activation: new ReLU()));
model.Add(new Dense(1, activation: new Sigmoid()));
// Compile the model (for the moment, only the mean square
// error loss is supported, but this should be solved soon)
model.Compile(loss: new MeanSquareError(),
optimizer: new Adam(),
metrics: new[] { new Accuracy() });
// Fit the model for 150 epochs
model.fit(x, y, epochs: 150, batch_size: 10);
// Use the model to make predictions
float[] pred = model.predict(x)[0].To <float[]>();
// Evaluate the model
double[] scores = model.evaluate(x, y);
Console.WriteLine($"{model.metrics_names[1]}: {scores[1] * 100}");
Console.ReadLine();
}
