/// <summary>
/// Finds the best matching unit.
/// </summary>
/// <param name="grid">The grid.</param>
/// <param name="datum">The datum.</param>
/// <returns>INeuron.</returns>
public IBestMatchingUnit FindBestMatchingUnit(IGrid2D grid, IDatum datum)
{
// get weights from datum
var referenceWeighs = datum.MapToWeights();
// prepare search
var metric = _metric;
var smallestDistance = Double.NaN;
var bmu = null as IGridNeuron;
// linear search
foreach (var gridNeuron in grid)
{
var weigths = gridNeuron.Neuron.Weights;
var distance = metric.CalculateDistance(referenceWeighs, weigths);
if (!(Double.IsNaN(smallestDistance) || distance < smallestDistance))
{
continue;
}
smallestDistance = distance;
bmu = gridNeuron;
}
return(new BestMatchingUnit(bmu, smallestDistance));
}
