public void SoftMaxGradient()
{
// input = [1, 0.1, 0.1, 0.1]
var input = new Double.Volume(new[] { 1.0, 0.1, 0.1, 0.1 }, new Shape(1, 1, -1, 1));
// output = softmax(input)
var output = input.SoftMax();
// groundTruth = [0, 1, 0 , 0]
var groundTruth = new Double.Volume(new[] { 0.0, 1.0, 0.0, 0.0 }, new Shape(1, 1, -1, 1));
// output gradient = 1 - groundTruth ./ output
var outputGradient = new Double.Volume(new double[4], new Shape(1, 1, -1, 1));
groundTruth.Storage.Map((p, q) => 1 - p / q, output.Storage, outputGradient.Storage);
// inputGradient = softmax_gradient(output, outputGradient)
var inputGradient = output.SoftMaxGradient(outputGradient);
// theorical result = output-groundTruth
var result = output - groundTruth;
Assert.AreEqual(result.Get(0, 0, 0, 0), inputGradient.Get(0, 0, 0, 0), 1e-4);
Assert.AreEqual(result.Get(0, 0, 1, 0), inputGradient.Get(0, 0, 1, 0), 1e-4);
Assert.AreEqual(result.Get(0, 0, 2, 0), inputGradient.Get(0, 0, 2, 0), 1e-4);
Assert.AreEqual(result.Get(0, 0, 3, 0), inputGradient.Get(0, 0, 3, 0), 1e-4);
}
public void SoftMax()
{
var volume1 = new Double.Volume(new[] { 0.0, 0.0, 0.0, 10000.0 }, new Shape(1, 1, -1, 1));
var softmax1 = volume1.SoftMax();
Assert.AreEqual(0.0, softmax1.Get(0, 0, 0, 0));
Assert.AreEqual(0.0, softmax1.Get(0, 0, 1, 0));
Assert.AreEqual(0.0, softmax1.Get(0, 0, 1, 0));
Assert.AreEqual(1.0, softmax1.Get(0, 0, 3, 0));
var volume2 = new Double.Volume(new[] { 10000.0, 0.0, 0.0, 10000.0 }, new Shape(1, 1, -1, 1));
var softmax2 = volume2.SoftMax();
Assert.AreEqual(0.5, softmax2.Get(0, 0, 0, 0));
Assert.AreEqual(0.5, softmax2.Get(0, 0, 3, 0));
}
public void SoftMax()
{
var input1 = new Double.Volume(new[] { 0.0, 0.0, 0.0, 10000.0 }, new Shape(1, 1, -1, 1),
GpuContext.Default);
var softmax1 = input1.SoftMax();
Assert.AreEqual(0.0, softmax1.Get(0, 0, 0, 0));
Assert.AreEqual(0.0, softmax1.Get(0, 0, 1, 0));
Assert.AreEqual(0.0, softmax1.Get(0, 0, 2, 0));
Assert.AreEqual(1.0, softmax1.Get(0, 0, 3, 0));
var input2 = new Double.Volume(new[] { 10000.0, 0.0, 0.0, 10000.0 }, new Shape(1, 1, -1, 1),
GpuContext.Default);
var softmax2 = input2.SoftMax();
Assert.AreEqual(0.5, softmax2.Get(0, 0, 0, 0));
Assert.AreEqual(0.5, softmax2.Get(0, 0, 3, 0));
}
public void SoftMaxBatch()
{
var volume1 = new Double.Volume(new[]
{
0.0, 0.0, 0.0, 10000.0,
0.0, 0.0, 10000.0, 0.0
}, new Shape(1, 1, -1, 2), GpuContext.Default);
var softmax1 = volume1.SoftMax();
Assert.AreEqual(0.0, softmax1.Get(0, 0, 0, 0));
Assert.AreEqual(0.0, softmax1.Get(0, 0, 1, 0));
Assert.AreEqual(0.0, softmax1.Get(0, 0, 2, 0));
Assert.AreEqual(1.0, softmax1.Get(0, 0, 3, 0));
Assert.AreEqual(0.0, softmax1.Get(0, 0, 0, 1));
Assert.AreEqual(0.0, softmax1.Get(0, 0, 1, 1));
Assert.AreEqual(1.0, softmax1.Get(0, 0, 2, 1));
Assert.AreEqual(0.0, softmax1.Get(0, 0, 3, 1));
}
