public virtual TransducerGraph.Arc ProcessArc(TransducerGraph.Arc a)
{
a = new TransducerGraph.Arc(a);
a.SetInput(Generics.NewPair(a.GetInput(), a.GetOutput()));
a.SetOutput(null);
return(a);
}
/// <summary>For testing only.</summary>
/// <remarks>For testing only. Doubles combined by addition.</remarks>
public virtual double GetOutputOfPathInGraph(IList path)
{
double score = 0.0;
object node = GetStartNode();
foreach (object input in path)
{
TransducerGraph.Arc arc = GetArcBySourceAndInput(node, input);
// next input in path
if (arc == null)
{
System.Console.Out.WriteLine(" NOT ACCEPTED :" + path);
return(double.NegativeInfinity);
}
score += ((double)arc.GetOutput());
node = arc.GetTargetNode();
}
return(score);
}
/// <summary>Takes time linear in number of arcs.</summary>
public static ClassicCounter ComputeLambda(TransducerGraph graph)
{
ArrayList queue = new ArrayList();
ClassicCounter lambda = new ClassicCounter();
ClassicCounter length = new ClassicCounter();
IDictionary first = new Hashtable();
ISet nodes = graph.GetNodes();
foreach (object node in nodes)
{
lambda.SetCount(node, 0);
length.SetCount(node, double.PositiveInfinity);
}
ISet endNodes = graph.GetEndNodes();
foreach (object o in endNodes)
{
lambda.SetCount(o, 0);
length.SetCount(o, 0);
queue.AddLast(o);
}
// Breadth first search
// get the first node from the queue
object node_1 = null;
try
{
node_1 = queue.RemoveFirst();
}
catch (NoSuchElementException)
{
}
while (node_1 != null)
{
double oldLen = length.GetCount(node_1);
ISet arcs = graph.GetArcsByTarget(node_1);
if (arcs != null)
{
foreach (object arc1 in arcs)
{
TransducerGraph.Arc arc = (TransducerGraph.Arc)arc1;
object newNode = arc.GetSourceNode();
IComparable a = (IComparable)arc.GetInput();
double k = ((double)arc.GetOutput());
double newLen = length.GetCount(newNode);
if (newLen == double.PositiveInfinity)
{
// we are discovering this
queue.AddLast(newNode);
}
IComparable f = (IComparable)first[newNode];
if (newLen == double.PositiveInfinity || (newLen == oldLen + 1 && a.CompareTo(f) < 0))
{
// f can't be null, since we have a newLen
// we do this to this to newNode when we have new info, possibly many times
first[newNode] = a;
// ejecting old one if necessary
length.SetCount(newNode, oldLen + 1);
// this may already be the case
lambda.SetCount(newNode, k + lambda.GetCount(node_1));
}
}
}
// get a new node from the queue
node_1 = null;
try
{
node_1 = queue.RemoveFirst();
}
catch (NoSuchElementException)
{
}
}
return(lambda);
}
protected internal Arc(TransducerGraph.Arc <NODE, IN, OUT> a)
: this(a.GetSourceNode(), a.GetTargetNode(), a.GetInput(), a.GetOutput())
{
}
