public void ApplyMutation(ref NetModel net)
{
var(fromId, toId) = GetRandomNodeIds(net);
if (HasConnection(net, fromId, toId) is { } id)
{
ToggleConnection(ref net, id);
return;
}
// Finds innovation number based on connection locations: from, to
var innovation = _innovationController.FetchWithInsertOnFail(new InnovationModel
{
BatchId = net.BatchId,
NodeFromId = fromId,
NodeToId = toId,
Type = InnovationType.Connection
});
// Creates new connections
var rnd = new Random();
var connection = new ConnectionModel
{
FromId = fromId,
ToId = toId,
InnovationId = innovation.Id,
NetworkId = net.Id,
Weight = rnd.NextDouble() * 2 - 1 // Range of -1 to 1
};
// Saves and Adds new connection to network
_connectionProcessor.Save(ref connection);
net.Connections.Add(connection);
}
public void ApplyMutation(ref NetModel net)
{
// There is no connection thus no point of trying to insert node,
// because it can only be inserted between two nodes AKA in connection
if (net.Connections.Count == 0)
{
return;
}
// Finds connection - random
var rnd = new Random();
var connection = net.Connections[rnd.Next(0, net.Connections.Count)];
// Gets innovation id for new node
var innovation = _innovationController.FetchWithInsertOnFail(new InnovationModel
{
BatchId = net.BatchId,
NodeFromId = connection.FromId,
NodeToId = connection.ToId,
Type = InnovationType.Node
});
// Makes two new connections, thus inserting new node between two others
var connFromToNew = new ConnectionModel
{
FromId = connection.FromId,
ToId = innovation.Id,
NetworkId = net.Id,
InnovationId = _innovationController.FetchWithInsertOnFail(new InnovationModel
{
BatchId = net.BatchId,
NodeFromId = connection.FromId,
NodeToId = innovation.Id,
Type = InnovationType.Connection
}).Id
};
_connectionProcessor.Save(ref connFromToNew);
net.Connections.Add(connFromToNew);
var connNewToTo = new ConnectionModel
{
FromId = innovation.Id,
ToId = connection.ToId,
NetworkId = net.Id,
InnovationId = _innovationController.FetchWithInsertOnFail(new InnovationModel
{
BatchId = net.BatchId,
NodeFromId = innovation.Id,
NodeToId = connection.ToId,
Type = InnovationType.Connection
}).Id
};
_connectionProcessor.Save(ref connNewToTo);
net.Connections.Add(connNewToTo);
// Disables old connection
connection.Enabled = false;
_connectionProcessor.Update(connection);
// Create new node only if it doesn't exist
if (net.Nodes.Any(n => n.InnovationId == innovation.Id))
{
return;
}
var nodeModel = new NodeModel
{
InnovationId = innovation.Id,
NetworkId = net.Id
};
_nodeProcessor.Save(ref nodeModel);
net.Nodes.Add(nodeModel);
}