/// <summary>
/// Output the segmentation into a segmentation graph.
/// Construct a state for each of the segments, then
/// add transitions between states (segments)
/// from min(segments[i]) to max(segments[i])+1.
/// </summary>
public override void GetLattice(IGenericFst fst)
{
fst.Clear();
int final = NarrayUtil.Max(labels) + 1;
Intarray states = new Intarray(final + 1);
states.Fill(-1);
for (int i = 1; i < states.Length(); i++)
{
states[i] = fst.NewState();
}
fst.SetStart(states[1]);
fst.SetAccept(states[final]);
for (int i = 0; i < boxes.Length(); i++)
{
int start = NarrayUtil.Min(segments.At1d(i));
int end = NarrayUtil.Max(segments.At1d(i));
int id = (start << 16) + end;
if (segments.At1d(i).Length() == 0)
{
id = 0;
}
float yes = spaces[i, 0];
float no = spaces[i, 1];
// if no space is set, assume no space is present
if (yes == float.PositiveInfinity && no == float.PositiveInfinity)
{
no = 0.0f;
}
for (int j = 0; j < class_costs[i].Length(); j++)
{
float cost = class_costs[i][j];
string str = class_outputs[i][j];
int n = str.Length;
int last = start;
for (int k = 0; k < n; k++)
{
int c = (int)str[k];
if (k < n - 1)
{
// add intermediate states/transitions for all but the last character
states.Push(fst.NewState());
fst.AddTransition(states[last], states.Last(), c, 0.0f, 0);
last = states.Length() - 1;
}
else
{
// for the last character, handle the spaces as well
if (no < 1000.0f)
{
// add the last character as a direct transition with no space
fst.AddTransition(states[last], states[end + 1], c, cost + no, id);
}
if (yes < 1000.0f)
{
// insert another state to handle spaces
states.Push(fst.NewState());
int space_state = states.Last();
fst.AddTransition(states[start], space_state, c, cost, id);
fst.AddTransition(space_state, states[end + 1], (int)' ', yes, 0);
}
}
} // for k
} // for j
} // for i
}
