From 291d2ea1bf6994f4c58be5c177ec566fa94f1b64 Mon Sep 17 00:00:00 2001
From: Jaron Kent-Dobias <jaron@kent-dobias.com>
Date: Sat, 17 Sep 2022 14:47:42 +0200
Subject: Changes to how the propogation happens.

---
 rbmp.cpp | 27 +++++++++++++++------------
 1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/rbmp.cpp b/rbmp.cpp
index 7d43d14..ffc7c44 100644
--- a/rbmp.cpp
+++ b/rbmp.cpp
@@ -31,10 +31,9 @@ private:
 
 public:
   const Edge& edge;
-  double oldX;
   double X;
 
-  HalfEdge(const Edge& e) : edge(e), oldX(0) {}
+  HalfEdge(const Edge& e) : edge(e), X(0) {}
   void setVertices(Vertex& vt, Vertex& vh) {
     tail = &vt;
     head = &vh;
@@ -88,25 +87,26 @@ public:
     }
   }
 
-  double propagateBeliefs() {
-# pragma omp parallel for
-    for (Edge& e : edges) {
-      for (HalfEdge& h : e.halfedges) {
+  void propagateBeliefs() {
+    for (unsigned i : {0, 1}) {
+#pragma omp parallel for
+      for (Edge& e : edges) {
+        HalfEdge& h = e.halfedges[i];
         h.X = std::numeric_limits<double>::infinity();
         for (const HalfEdge& hn : h.getHead().neighbors) {
           if (h.getTail().index != hn.getHead().index) {
-            h.X = std::min(hn.edge.weight - hn.oldX, h.X);
+            h.X = std::min(hn.edge.weight - hn.X, h.X);
           }
         }
       }
     }
+  }
 
+  double minBelief() const {
     double minBelief = std::numeric_limits<double>::infinity();
-    for (Edge& e : edges) {
+
+    for (const Edge& e : edges) {
       minBelief = std::min(std::abs(e.belief()), minBelief);
-      for (HalfEdge& he : e.halfedges) {
-        he.oldX = he.X;
-      }
     }
 
     return minBelief;
@@ -143,7 +143,10 @@ int main(int argc, char* argv[]) {
   double minBelief = 0;
 
   while (minBelief < beliefThreshold && steps < maxSteps) {
-    minBelief = G.propagateBeliefs();
+    G.propagateBeliefs();
+    if (steps % 100 == 0) {
+      std::cerr << (minBelief = G.minBelief()) << std::endl;
+    }
     steps++;
   }
 
-- 
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