private void PaintConnection(GraphConnection con, PaintState state)
{
Point srcPos = ModelToViewport(con.SourceNode.Position, state);
Point tgtPos = ModelToViewport(con.TargetNode.Position, state);
// Connections leave from the base of the source node and enter the top of the target node.
// Adjust end points to make them neatly terminate just underneath the edge of the endpoint nodes.
srcPos.Y += (int)(state._nodeDiameterHalf * 0.9f);
tgtPos.Y -= (int)(state._nodeDiameterHalf * 0.9f);
// Is any part of the connection within the viewport area?
if (!IsPointWithinViewport(srcPos, state) && !IsPointWithinViewport(tgtPos, state))
{ // Skip connection. It's outside the viewport area.
return;
}
// Create a pen for painting the connection.
// Width is related to connection strength/magnitude.
float width = (float)(con.Weight < 0.0 ? -Math.Log10(1.0 - con.Weight) : Math.Log10(1.0 + con.Weight));
width = width * state._connectionWeightToWidth * state._zoomFactor;
width = Math.Max(1f, Math.Abs(width));
Pen pen = new Pen(con.Weight < 0f ? _connectionNegative : _connectionPositive, width);
// Draw the connection line.
if (tgtPos.Y > srcPos.Y)
{
// Target is below the source. Draw a straight line.
state._g.DrawLine(pen, srcPos, tgtPos);
}
else
{
// Target is above source. Draw a back-connection.
PaintBackConnection(pen, srcPos, tgtPos,
state.GetNodeStateInfo(con.SourceNode),
state.GetNodeStateInfo(con.TargetNode),
state);
}
}
/// <summary>
/// Create an IOGraph that represents the structure described by the provided INetworkDefinition.
/// </summary>
public IOGraph CreateGraph(INetworkDefinition networkDef)
{
// Perform depth analysis of network.
NetworkDepthInfo depthInfo;
if (networkDef.IsAcyclic)
{
AcyclicNetworkDepthAnalysis depthAnalysis = new AcyclicNetworkDepthAnalysis();
depthInfo = depthAnalysis.CalculateNodeDepths(networkDef);
}
else
{
CyclicNetworkDepthAnalysis depthAnalysis = new CyclicNetworkDepthAnalysis();
depthInfo = depthAnalysis.CalculateNodeDepths(networkDef);
}
// Create an IOGraph, allocating storage for the node lists.
INodeList nodeList = networkDef.NodeList;
int nodeCount = nodeList.Count;
int inputCount = networkDef.InputNodeCount + 1; // + to count bias as an input layer node.
int outputCount = networkDef.OutputNodeCount;
int hiddenCount = nodeCount - (inputCount + outputCount);
IOGraph ioGraph = new IOGraph(inputCount, outputCount, hiddenCount, 0f, depthInfo._networkDepth);
// We also build a dictionary of nodes keyed by innovation ID. This is used later
// to assign connections to nodes.
Dictionary <uint, GraphNode> nodeDict = new Dictionary <uint, GraphNode>(nodeCount);
// Loop input nodes.
int idx = 0;
for (int i = 0; i < inputCount; i++, idx++)
{ // Create node, assign it a tag and add it to the node dictionary and the
// input node list of the IOGraph.
uint innovationId = nodeList[idx].Id;
GraphNode node = new GraphNode(innovationId.ToString());
node.AuxData = CreateGraphNodeAuxData(nodeList[idx]);
node.Depth = depthInfo._nodeDepthArr[idx];
nodeDict.Add(innovationId, node);
ioGraph.InputNodeList.Add(node);
}
// Loop output nodes.
for (int i = 0; i < outputCount; i++, idx++)
{ // Create node, assign it a tag and add it to the node dictionary and the
// output node list of the IOGraph.
uint innovationId = nodeList[idx].Id;
GraphNode node = new GraphNode(innovationId.ToString());
node.AuxData = CreateGraphNodeAuxData(nodeList[idx]);
node.Depth = depthInfo._nodeDepthArr[idx];
nodeDict.Add(innovationId, node);
ioGraph.OutputNodeList.Add(node);
}
// Loop hidden nodes.
for (; idx < nodeCount; idx++)
{ // Create node, assign it a tag and add it to the node dictionary and the
// hidden node list of the IOGraph.
uint innovationId = nodeList[idx].Id;
GraphNode node = new GraphNode(innovationId.ToString());
node.AuxData = CreateGraphNodeAuxData(nodeList[idx]);
node.Depth = depthInfo._nodeDepthArr[idx];
nodeDict.Add(innovationId, node);
ioGraph.HiddenNodeList.Add(node);
}
// Loop connections. Build GraphConnection objects and connect them to their source
// and target nodes.
double maxAbsWeight = 0.1; // Start at a non-zero value to prevent possibility of a divide by zero occuring.
IConnectionList connectionList = networkDef.ConnectionList;
int connCount = connectionList.Count;
for (int i = 0; i < connCount; i++)
{
// Create connection object and assign its source and target nodes.
INetworkConnection connection = connectionList[i];
GraphNode sourceNode = nodeDict[connection.SourceNodeId];
GraphNode targetNode = nodeDict[connection.TargetNodeId];
GraphConnection conn = new GraphConnection(sourceNode, targetNode, (float)connection.Weight);
// Add the connection to the connection lists on the source and target nodes.
sourceNode.OutConnectionList.Add(conn);
targetNode.InConnectionList.Add(conn);
// Track weight range oevr all connections.
double absWeight = Math.Abs(connection.Weight);
if (absWeight > maxAbsWeight)
{
maxAbsWeight = absWeight;
}
}
ioGraph.ConnectionWeightRange = (float)maxAbsWeight;
return(ioGraph);
}
private void PaintConnection(GraphConnection con, PaintState state)
{
Point srcPos = ModelToViewport(con.SourceNode.Position, state);
Point tgtPos = ModelToViewport(con.TargetNode.Position, state);
// Connections leave from the base of the source node and enter the top of the target node.
// Adjust end points to make them neatly terminate just underneath the edge of the endpoint nodes.
srcPos.Y += (int)(state._nodeDiameterHalf * 0.9f);
tgtPos.Y -= (int)(state._nodeDiameterHalf * 0.9f);
// Is any part of the connection within the viewport area?
if(!IsPointWithinViewport(srcPos, state) && !IsPointWithinViewport(tgtPos, state))
{ // Skip connection. It's outside the viewport area.
return;
}
// Create a pen for painting the connection.
// Width is related to connection strength/magnitude.
float width = (float)(con.Weight < 0.0 ? -Math.Log10(1.0 - con.Weight) : Math.Log10(1.0 + con.Weight));
width = width * state._connectionWeightToWidth * state._zoomFactor;
width = Math.Max(1f, Math.Abs(width));
Pen pen = new Pen(con.Weight < 0f ? _connectionNegative : _connectionPositive, width);
// Draw the connection line.
if(tgtPos.Y > srcPos.Y)
{
// Target is below the source. Draw a straight line.
state._g.DrawLine(pen, srcPos, tgtPos);
}
else
{
// Target is above source. Draw a back-connection.
PaintBackConnection(pen, srcPos, tgtPos,
state.GetNodeStateInfo(con.SourceNode),
state.GetNodeStateInfo(con.TargetNode),
state);
}
}
/// <summary>
/// Create an IOGraph that represents the structure described by the provided INetworkDefinition.
/// </summary>
public IOGraph CreateGraph(INetworkDefinition networkDef)
{
// Perform depth analysis of network.
NetworkDepthInfo depthInfo;
if(networkDef.IsAcyclic)
{
AcyclicNetworkDepthAnalysis depthAnalysis = new AcyclicNetworkDepthAnalysis();
depthInfo = depthAnalysis.CalculateNodeDepths(networkDef);
}
else
{
CyclicNetworkDepthAnalysis depthAnalysis = new CyclicNetworkDepthAnalysis();
depthInfo = depthAnalysis.CalculateNodeDepths(networkDef);
}
// Create an IOGraph, allocating storage for the node lists.
INodeList nodeList = networkDef.NodeList;
int nodeCount = nodeList.Count;
int inputCount = networkDef.InputNodeCount + 1; // + to count bias as an input layer node.
int outputCount = networkDef.OutputNodeCount;
int hiddenCount = nodeCount - (inputCount + outputCount);
IOGraph ioGraph = new IOGraph(inputCount, outputCount, hiddenCount, 0f, depthInfo._networkDepth);
// We also build a dictionary of nodes keyed by innovation ID. This is used later
// to assign connections to nodes.
Dictionary<uint, GraphNode> nodeDict = new Dictionary<uint,GraphNode>(nodeCount);
// Loop input nodes.
int idx = 0;
for(int i=0; i<inputCount; i++, idx++)
{ // Create node, assign it a tag and add it to the node dictionary and the
// input node list of the IOGraph.
uint innovationId = nodeList[idx].Id;
GraphNode node = new GraphNode(innovationId.ToString());
node.AuxData = CreateGraphNodeAuxData(nodeList[idx]);
node.Depth = depthInfo._nodeDepthArr[idx];
nodeDict.Add(innovationId, node);
ioGraph.InputNodeList.Add(node);
}
// Loop output nodes.
for(int i=0; i<outputCount; i++, idx++)
{ // Create node, assign it a tag and add it to the node dictionary and the
// output node list of the IOGraph.
uint innovationId = nodeList[idx].Id;
GraphNode node = new GraphNode(innovationId.ToString());
node.AuxData = CreateGraphNodeAuxData(nodeList[idx]);
node.Depth = depthInfo._nodeDepthArr[idx];
nodeDict.Add(innovationId, node);
ioGraph.OutputNodeList.Add(node);
}
// Loop hidden nodes.
for(; idx<nodeCount; idx++)
{ // Create node, assign it a tag and add it to the node dictionary and the
// hidden node list of the IOGraph.
uint innovationId = nodeList[idx].Id;
GraphNode node = new GraphNode(innovationId.ToString());
node.AuxData = CreateGraphNodeAuxData(nodeList[idx]);
node.Depth = depthInfo._nodeDepthArr[idx];
nodeDict.Add(innovationId, node);
ioGraph.HiddenNodeList.Add(node);
}
// Loop connections. Build GraphConnection objects and connect them to their source
// and target nodes.
double maxAbsWeight = 0.1; // Start at a non-zero value to prevent possibility of a divide by zero occurring.
IConnectionList connectionList = networkDef.ConnectionList;
int connCount = connectionList.Count;
for(int i=0; i<connCount; i++)
{
// Create connection object and assign its source and target nodes.
INetworkConnection connection = connectionList[i];
GraphNode sourceNode = nodeDict[connection.SourceNodeId];
GraphNode targetNode = nodeDict[connection.TargetNodeId];
GraphConnection conn = new GraphConnection(sourceNode, targetNode, (float)connection.Weight);
// Add the connection to the connection lists on the source and target nodes.
sourceNode.OutConnectionList.Add(conn);
targetNode.InConnectionList.Add(conn);
// Track weight range over all connections.
double absWeight = Math.Abs(connection.Weight);
if(absWeight > maxAbsWeight) {
maxAbsWeight = absWeight;
}
}
ioGraph.ConnectionWeightRange = (float)maxAbsWeight;
return ioGraph;
}