[FIX] field's name for duration, values float to fraction

unified_planning/plans/ttp_to_stn.py

@@ -21,7 +21,7 @@ def is_time_in_interv(
     interval: "up.model.timing.TimeInterval",
 ) -> bool:
     """
-    Return if the is in the interval.
+    Return if the timepoint is in the interval given.
     """
     time_pt = _absolute_time(timing, start=start, duration=duration)
     upper_time = _absolute_time(interval._upper, start=start, duration=duration)
@@ -202,11 +202,11 @@ def partial_order_plan_to_stn(self) -> nx.DiGraph:
                 self.ai_act_map[act_end.name],
             )
             graph.add_edge(ai_start, ai_end)
-            duration = (
+            interval = (
                 self.act_to_time_map[act_end.name]
                 - self.act_to_time_map[act_start.name]
             )
-            graph[ai_start][ai_end]["interval"] = [duration, duration]
+            graph[ai_start][ai_end]["interval"] = [interval, interval]
 
         # Add start and end nodes
 
@@ -219,7 +219,7 @@ def partial_order_plan_to_stn(self) -> nx.DiGraph:
         graph.add_edge(
             start,
             list(self.partial_order_plan.get_adjacency_list.keys())[0],
-            interval=[0.0, 0.0],
+            interval=[Fraction(0, 1), Fraction(0, 1)],
         )
         # Add edge between end and last node
         graph.add_edge(
@@ -231,7 +231,7 @@ def partial_order_plan_to_stn(self) -> nx.DiGraph:
                 if item.action._name != "START" and item.action._name != "END"
             ][0],
             end,
-            interval=[0.0, 0.0],
+            interval=[Fraction(0, 1), Fraction(0, 1)],
         )
 
         self.stn = graph