internal static NeuralNetworkPredictionsReport UpdateFor(
NeuralNetworkPredictionsReport previousReport,
BankTransactionClass predictionClass,
bool predictionWasCorrect)
{
if (predictionWasCorrect)
{
return(new NeuralNetworkPredictionsReport(
previousReport.TotalCorrectPredictions + 1,
previousReport.TotalIncorrectPredictions,
previousReport.IncorrectFraudulentPredictions,
previousReport.IncorrectLegitimatePredictions));
}
if (predictionClass == BankTransactionClass.Fraudulent)
{
return(new NeuralNetworkPredictionsReport(
previousReport.TotalCorrectPredictions,
previousReport.TotalIncorrectPredictions + 1,
previousReport.IncorrectFraudulentPredictions + 1,
previousReport.IncorrectLegitimatePredictions));
}
if (predictionClass == BankTransactionClass.Legitimate)
{
return(new NeuralNetworkPredictionsReport(
previousReport.TotalCorrectPredictions,
previousReport.TotalIncorrectPredictions + 1,
previousReport.IncorrectFraudulentPredictions,
previousReport.IncorrectLegitimatePredictions + 1));
}
throw new InvalidOperationException($"Transaction class {predictionClass} is not supported.");
}
private List <BankTransaction> TrainingDataRowsForClass(BankTransactionClass targetClass)
{
var dataRowsInClass = allDataRows.Value
.Where(transaction => transaction.Class == targetClass)
.ToList();
return(RandomSubsetOfDataSet(dataRowsInClass, rowCountOfSmallestTransactionCategory.Value / 2));
}
private bool IsCorrectPrediction(double[] prediction, BankTransactionClass actualClass)
{
var predictedClass = Array.IndexOf(prediction, prediction.Max());
return((BankTransactionClass)predictedClass == actualClass ? true : false);
}
