Better schedule, including plotting

• plot_schedule method that plots the schedule
• forward_slack and backward_slack
• Execution times supported
• Slightly different graph_id that more often do not change the previous
• scipy is now a dependency for drawing splines

Close #35 (closed)

b_asic/schema.py

@@ -4,7 +4,7 @@ Contains the schema class for scheduling operations in an SFG.
 """
 
 from collections import defaultdict
-from typing import Dict, List, Optional
+from typing import Dict, List, Optional, Tuple
 import matplotlib.pyplot as plt
 from matplotlib.ticker import MaxNLocator
 import numpy as np
@@ -96,6 +96,10 @@ class Schema:
                 slack = min(slack, usage_time - available_time)
         return slack
 
+    def slacks(self, op_id: GraphID) -> Tuple(int, int):
+        assert op_id in self._start_times, "No operation with the specified op_id in this schema."
+        return (self.backward_slack(op_id), self.forward_slack(op_id))
+
     def print_slacks(self) -> None:
         raise NotImplementedError