Adding comments.

[mtp.git] / tracker.cc

diff --git a/tracker.cc b/tracker.cc
index c66c89d..675ba2d 100644 (file)
--- a/tracker.cc
+++ b/tracker.cc
@@ -26,7 +26,7 @@ Tracker::Tracker(int nb_time_steps, int nb_locations) {
   _nb_locations = nb_locations;
   _nb_time_steps = nb_time_steps;
 
-  detection_score = allocate_array<scalar_t>(_nb_time_steps, _nb_locations);
+  detection_scores = allocate_array<scalar_t>(_nb_time_steps, _nb_locations);
   allowed_motion = allocate_array<int>(_nb_locations, _nb_locations);
 
   entrances = new int[_nb_locations];
@@ -42,7 +42,7 @@ Tracker::Tracker(int nb_time_steps, int nb_locations) {
 
   for(int t = 0; t < _nb_time_steps; t++) {
     for(int l = 0; l < _nb_locations; l++) {
-      detection_score[t][l] = 0.0;
+      detection_scores[t][l] = 0.0;
     }
   }
 
@@ -53,12 +53,20 @@ Tracker::Tracker(int nb_time_steps, int nb_locations) {
 Tracker::~Tracker() {
   delete[] _edge_lengths;
   delete _graph;
-  deallocate_array<scalar_t>(detection_score);
+  deallocate_array<scalar_t>(detection_scores);
   deallocate_array<int>(allowed_motion);
   delete[] exits;
   delete[] entrances;
 }
 
+int Tracker::early_pair_node(int t, int l) {
+  return 1 + (2 * (t + 0) + 0) * _nb_locations + l;
+}
+
+int Tracker::late_pair_node(int t, int l) {
+  return 1 + (2 * (t + 0) + 1) * _nb_locations + l;
+}
+
 void Tracker::build_graph() {
   // Delete the existing graph if there was one
   delete[] _edge_lengths;
@@ -98,13 +106,13 @@ void Tracker::build_graph() {
   _edge_lengths = new scalar_t[nb_edges];
 
   // We put the in-node edges first, since these are the ones whose
-  // lengths we will have to set later, according to the detection
-  // scores
+  // lengths we will have to change before tracking, according to the
+  // detection scores
 
   for(int t = 0; t < _nb_time_steps; t++) {
     for(int l = 0; l < _nb_locations; l++) {
-      node_from[e] = 1 + (2 * (t + 0) + 0) * _nb_locations + l;
-      node_to[e] =   1 + (2 * (t + 0) + 1) * _nb_locations + l;
+      node_from[e] = early_pair_node(t, l);
+      node_to[e] = late_pair_node(t, l);
       e++;
     }
   }
@@ -119,15 +127,15 @@ void Tracker::build_graph() {
   for(int t = 0; t < _nb_time_steps; t++) {
     for(int l = 0; l < _nb_locations; l++) {
       if(t == _nb_time_steps - 1) {
-        node_from[e] = 1 + (2 * (t + 0) + 1) * _nb_locations + l;
+        node_from[e] = late_pair_node(t, l);
         node_to[e] = sink;
         _edge_lengths[e] = 0.0;
         e++;
       } else {
         for(int k = 0; k < _nb_locations; k++) {
           if(allowed_motion[l][k]) {
-            node_from[e] = 1 + (2 * (t + 0) + 1) * _nb_locations + l;
-            node_to[e] =   1 + (2 * (t + 1) + 0) * _nb_locations + k;
+            node_from[e] = late_pair_node(t, l);
+            node_to[e] = early_pair_node(t+1, k);
             _edge_lengths[e] = 0.0;
             e++;
           }
@@ -140,12 +148,12 @@ void Tracker::build_graph() {
     for(int l = 0; l < _nb_locations; l++) {
       if(t > 0 && entrances[l]) {
         node_from[e] = source;
-        node_to[e] =   1 + (2 * (t + 0) + 0) * _nb_locations + l;
+        node_to[e] = early_pair_node(t, l);
         _edge_lengths[e] = 0.0;
         e++;
       }
       if(t < _nb_time_steps - 1 && exits[l]) {
-        node_from[e] =   1 + (2 * (t + 0) + 1) * _nb_locations + l;
+        node_from[e] = late_pair_node(t, l);
         node_to[e] = sink;
         _edge_lengths[e] = 0.0;
         e++;
@@ -165,7 +173,7 @@ void Tracker::print_graph_dot(ostream *os) {
   int e = 0;
   for(int t = 0; t < _nb_time_steps; t++) {
     for(int l = 0; l < _nb_locations; l++) {
-      _edge_lengths[e++] = - detection_score[t][l];
+      _edge_lengths[e++] = - detection_scores[t][l];
     }
   }
   _graph->print_dot(os);
@@ -175,7 +183,7 @@ void Tracker::track() {
   int e = 0;
   for(int t = 0; t < _nb_time_steps; t++) {
     for(int l = 0; l < _nb_locations; l++) {
-      _edge_lengths[e++] = - detection_score[t][l];
+      _edge_lengths[e++] = - detection_scores[t][l];
     }
   }