/// <summary>Takes time linear in number of arcs.</summary>
public virtual TransducerGraph PushLambdas(TransducerGraph graph, ClassicCounter lambda)
{
TransducerGraph result = null;
result = graph.Clone();
// arcs have been copied too so we don't mess up graph
ICollection <TransducerGraph.Arc> arcs = result.GetArcs();
foreach (TransducerGraph.Arc arc in arcs)
{
double sourceLambda = lambda.GetCount(arc.GetSourceNode());
double targetLambda = lambda.GetCount(arc.GetTargetNode());
double oldOutput = ((double)arc.GetOutput());
double newOutput = oldOutput + targetLambda - sourceLambda;
arc.SetOutput(newOutput);
}
// do initialOutput
double startLambda = lambda.GetCount(result.GetStartNode());
if (startLambda != 0.0)
{
// add it back to the outbound arcs from start (instead of adding it to the initialOutput)
ICollection <TransducerGraph.Arc> startArcs = result.GetArcsBySource(result.GetStartNode());
foreach (TransducerGraph.Arc arc_1 in startArcs)
{
double oldOutput = ((double)arc_1.GetOutput());
double newOutput = oldOutput + startLambda;
arc_1.SetOutput(newOutput);
}
}
// do finalOutput
foreach (object o in result.GetEndNodes())
{
double endLambda = lambda.GetCount(o);
if (endLambda != 0.0)
{
// subtract it from the inbound arcs to end (instead of subtracting it from the finalOutput)
ICollection <TransducerGraph.Arc> endArcs = result.GetArcsByTarget(o);
foreach (TransducerGraph.Arc arc_1 in endArcs)
{
double oldOutput = ((double)arc_1.GetOutput());
double newOutput = oldOutput - endLambda;
arc_1.SetOutput(newOutput);
}
}
}
return(result);
}
