Update.

[mtp.git] / mtp.cc

diff --git a/mtp.cc b/mtp.cc
index 105365d..4ba31d9 100644 (file)
--- a/mtp.cc
+++ b/mtp.cc
@@ -18,10 +18,6 @@
 
 // Multi-Tracked Path
 
-// Takes the graph description file as input and produces a dot file.
-
-// EXAMPLE: ./mtp ./graph2.txt  | dot -T pdf -o- | xpdf -
-
 #include <iostream>
 #include <fstream>
 #include <stdlib.h>
@@ -32,10 +28,18 @@ using namespace std;
 
 //////////////////////////////////////////////////////////////////////
 
+scalar_t detection_score(int true_label, scalar_t flip_noise) {
+  if((true_label > 0) == (drand48() < flip_noise)) {
+    return   1.0 + 0.2 * (drand48() - 0.5);
+  } else {
+    return - 1.0 + 0.2 * (drand48() - 0.5);
+  }
+}
+
 int main(int argc, char **argv) {
-  int nb_locations = 5;
-  int nb_time_steps = 20;
-  int motion_amplitude = 2;
+  int nb_locations = 1000;
+  int nb_time_steps = 1000;
+  int motion_amplitude = 1;
 
   Tracker *tracker = new Tracker(nb_time_steps, nb_locations);
 
@@ -43,28 +47,34 @@ int main(int argc, char **argv) {
     for(int k = 0; k < nb_locations; k++) {
       tracker->set_allowed_motion(l, k, abs(l - k) <= motion_amplitude);
     }
-    tracker->set_as_exit(0, 1);
     tracker->set_as_entrance(0, 1);
+    tracker->set_as_exit(nb_locations - 1, 1);
   }
 
   tracker->build_graph();
 
-  for(int r = 0; r < 10; r++) {
+  // We repeat several times the same tracking to check how stable it
+  // is
+
+  for(int r = 0; r < 1; r++) {
     cout << "* ROUND " << r << endl;
 
+    // We generate synthetic detection scores at location
+    // nb_locations/2, with 10% false detection (FP or FN)
+
     for(int t = 0; t < nb_time_steps; t++) {
       for(int l = 0; l < nb_locations; l++) {
-        tracker->set_detection_score(t, l,
-                                    (drand48() < 0.95 ? -1.0 : 1.0) + drand48() * 0.1 - 0.05);
+        tracker->set_detection_score(t, l, detection_score(-1, 0.95));
       }
-      tracker->set_detection_score(t, nb_locations/2,
-                                  (drand48() < 0.95 ? 1.0 : -1.0) + drand48() * 0.1 - 0.05);
+      tracker->set_detection_score(t, nb_locations/2, detection_score(1, 0.95));
     }
 
     tracker->track();
 
     for(int t = 0; t < tracker->nb_trajectories(); t++) {
-      cout << "TRAJECTORY " << t << " :";
+      cout << "TRAJECTORY "
+           << t
+           << " [starting " << tracker->trajectory_entrance_time(t) << "]";
       for(int u = 0; u < tracker->trajectory_duration(t); u++) {
         cout << " " << tracker->trajectory_location(t, u);
       }