add notes

DecMCTS.py

@@ -233,11 +233,14 @@ class Tree:
         state = self._get_system_state(start_node)
 
         # Propagate down the tree
+        # check how _select handles mu, N = 0
         while len(self._childNodes(start_node))>0:
             start_node = self._select(self._childNodes(start_node))
 
         ### EXPANSION
+        # check if _expansion changes start_node to the node after jumping
         self._expansion(start_node)
+        print(self._childNodes(start_node))
 
         ### SIMULATION
         avg_reward = 0