private void AddLayerText(LayerBase layer, StringBuilder builder)
{
string bias = layer.Bias?.Id ?? "(none)";
string nodesCount = layer.GetAllNodes().Count().ToString();
string next = layer.Next?.Id ?? "(this is the output layer)";
builder.AppendLine("Bias: " + bias);
builder.AppendLine("Nodes count: " + nodesCount);
builder.AppendLine("Next layer: " + next);
}