public void Train()
{
//Re-import the file to update the reference in the editor
AssetDatabase.ImportAsset(AssetDatabase.GetAssetPath(trainingAnswers));
var allLines = File.ReadAllText(AssetDatabase.GetAssetPath(trainingAnswers), Encoding.Default).Split(" \r\n".ToCharArray(), StringSplitOptions.RemoveEmptyEntries).Where(c => c.Length == 0);
Init(new NeuralNetwork(new int[4] {
camera.pixelWidth *camera.pixelHeight + 1, 64, 32, 6
}));
float[,] trainingOutputs = new float[trainingImages.Count, 6];
trainingOutputs = ReadAnswersFromFile();
//load all of the training images into a list
foreach (string file in System.IO.Directory.GetFiles(Application.dataPath + "/Racecar Training Images/"))
{
if (!file.Contains(".meta") && file.Contains(".bmp"))
{
trainingImages.Add(LoadTexture(file));
}
}
for (int i = 0; i < trainingIterations; i++)
{
foreach (Texture2D trainingImage in trainingImages)
{
//inputs = new float[trainingImage.height * trainingImage.width + 1];
int z = 0;
foreach (Color pixel in trainingImage.GetPixels())
{
//grayscale the pixels to change them from rgb values to a single float
inputs[z] = pixel.grayscale;
z++;
}
float[] outputs = new float[6];
float[] errors = null;
float[] errorTimesOutputs = null;
//Run through the network with the current weights
outputs = net.FeedForward(Sigmoid(inputs));
errors = new float[6];
//get the margin of error for each output and adjust the weights accordingly
for (int x = 0; x < outputs.Length; x++)
{
try
{
errors[x] = outputs[x] - trainingOutputs[trainingImages.IndexOf(trainingImage), x];
Debug.Log(errors[x]);
}
catch (Exception e)
{
Debug.Log("Something went wrong: " + e);
}
}
errorTimesOutputs = new float[6];
for (int y = 0; y < errorTimesOutputs.Length; y++)
{
errorTimesOutputs[y] = errors[y] * SigmoidDerivative(outputs[y]);
}
try
{
//Get dot product of the inputs and outputs
float adjustments = inputs.Zip(errorTimesOutputs, (d1, d2) => d1 * d2).Sum();
Debug.Log(adjustments);
//Tell the neural network to adjust all the weights
net.AdjustWeights(adjustments);
}
catch (Exception e)
{
Debug.Log("Something went wrong down here: " + e);
}
}
}
}
