rename expo folder to sela

sela/Greedy.py

@@ -0,0 +1,19 @@
+import random
+
+from sela.MCTS import MCTS
+
+
+class Greedy(MCTS):
+    def best_child(self):
+        if len(self.children) == 0:
+            return self.root_node
+        all_children = [child for children in self.children.values() for child in children]
+        return max(all_children, key=lambda x: x.normalized_reward.get("dev_score", 0))
+
+
+class Random(MCTS):
+    def best_child(self):
+        if len(self.children) == 0:
+            return self.root_node
+        all_children = [child for children in self.children.values() for child in children]
+        return random.choice(all_children)