Fixed cost function for transition reduce

reading_machine/src/Transition.cpp

@@ -209,7 +209,7 @@ void Transition::initReduce()
 
   cost = [](const Config & config)
   {
-    if (config.isToken(config.getWordIndex()))
+    if (!config.isToken(config.getWordIndex()))
       return 0;
 
     int cost = 0;