refine comments

metagpt/actions/action_graph.py

@@ -11,7 +11,7 @@ from __future__ import annotations
 
 
 class ActionGraph:
-    """ActionGraph: 用于定义一个图，图中的节点是 ActionNode 实例，节点间的依赖关系是有向边。"""
+    """ActionGraph: a directed graph to represent the dependency between actions."""
 
     def __init__(self):
         self.nodes = {}
@@ -19,18 +19,11 @@ class ActionGraph:
         self.execution_order = []
 
     def add_node(self, node):
-        """
-        添加一个节点到图中。
-        :param node: ActionNode 实例
-        """
+        """Add a node to the graph"""
         self.nodes[node.key] = node
 
     def add_edge(self, from_node: "ActionNode", to_node: "ActionNode"):
-        """
-        定义节点间的依赖关系。
-        :param from_node: 节点标识
-        :param to_node: 节点标识
-        """
+        """Add an edge to the graph"""
         if from_node.key not in self.edges:
             self.edges[from_node.key] = []
         self.edges[from_node.key].append(to_node.key)
@@ -38,9 +31,7 @@ class ActionGraph:
         to_node.add_prev(from_node)
 
     def topological_sort(self):
-        """
-        实现拓扑排序来确定执行顺序。
-        """
+        """Topological sort the graph"""
         visited = set()
         stack = []