public void Score(List <NetworkState> states, TrainingSample sample)
{
var availableOnsets = sample.Frames.Where(frame => frame.IsOnset).ToList();
int totalSelection = availableOnsets.Count(); // tp + fn
for (int i = 1; i < states.Count; i++)
{
NetworkState state = states[i];
double time = sample.Frames[i - 1].Frame.Start;
Debug.Assert(state.Output.Length == 1);
if (state.Output[0] < 0.25)
{
continue; // < state.Output[1]) continue;
}
TrainingFrame matchedOnset = availableOnsets.FirstOrDefault(onset => Math.Abs(onset.Frame.Start - time) < MatchingTolerance);
if (matchedOnset != null)
{
availableOnsets.Remove(matchedOnset);
truePositives++;
}
else
{
falsePositives++;
}
}
falseNegatives += availableOnsets.Count;
}
public void Train(TrainingSample sample, NetworkScorer scorer)
{
List <NetworkState> states = FeedForward(sample, scorer);
trainingState.Prepare(momentum: Momentum);
// Backpropogate through time.
for (int i = states.Count - 1; i >= 1; i--)
{
// Get the corresponding frame.
TrainingFrame frame = sample.Frames[i - 1];
NetworkState current = states[i];
NetworkState last = states[i - 1];
//bool annotatedOnsetNearby = IsAnnotatedOnsetNearby(sample, states, i);
double onCorrect = frame.IsOnset ? DetectionValue : NoDetectionValue;
//double offCorrect = frame.IsOnset ? 0.0 : 1.0;
trainingState.Errors[0] = (current.Output[0] - onCorrect);
// trainingState.Errors[1] = (current.Output[1] - offCorrect);
trainingState.BackPropogate(last: last, now: current);
}
// Apply the required weight changes.
trainingState.ApplyWeightChanges(LearningCoefficient);
}
public static Bitmap Draw(TrainingSample sample)
{
var frames = sample.Frames;
int height = frames[0].Frame.Values.Length;
Debug.Assert(height % 6 == 0);
int bands = height / 6;
Bitmap result = new Bitmap(frames.Length, bands * 6 + 5);
for (int x = 0; x < frames.Length; x++)
{
TrainingFrame frame = frames[x];
DrawRow(result, x, frame);
}
return(result);
}
private static void DrawRow(Bitmap bitmap, int x, TrainingFrame frame)
{
double[] values = frame.Frame.Values;
int bands = (bitmap.Height - 5) / 6;
int y = 0;
int index = 0;
for (int part = 0; part < 6; part++)
{
for (int i = 0; i < bands; i++)
{
bitmap.SetPixel(x, y++, GetColor(values[index++], frame.IsOnset));
}
if (part < 5)
{
bitmap.SetPixel(x, y++, Color.Black);
}
}
}
