[frontend] Fix bugs in maxpool2d_simplify and rename MaxPool2dOp for clarity

frontend/Python/graph/operation.py

@@ -124,10 +124,19 @@ def args(self):
     @property
     def kwargs(self):
         return self._keyword_arguments
+
+    @property
+    def parents(self):
+        return self._parents
+
+    @property
+    def children(self):
+        return self._children
 
     @property
     def name(self):
         return self._name
+
     @name.setter
     def name(self, new_name):
         self._name = new_name

frontend/Python/graph/transform/useless_op_eliminate.py

@@ -42,13 +42,24 @@ def maxpool2d_simplify(graph: Graph):
                 and getitem_node.args[1] == 0
             ):
                 new_node = MaxPool2dOp()
-                new_node.name = getitem_node.name
+                new_node.name = node.name.replace("_with_indices", "")
                 for arg in node.args:
                     new_node.add_argument(arg)
                 for parent in node._parents:
                     new_node.add_parent(parent)
+                    parent_node = graph.node_table[parent]
+                    for cindex, child in enumerate(parent_node.children):
+                        if child == node.name:
+                            parent_node.children[cindex] = new_node.name
                 for child in getitem_node._children:
                     new_node.add_children(child)
+                    child_node = graph.node_table[child]
+                    for pindex, parent in enumerate(child_node.parents):
+                        if parent == getitem_node.name:
+                            child_node.parents[pindex] = new_node.name
+                    for aindex, arg in enumerate(child_node.args):
+                        if arg == getitem_node.name:
+                            child_node.args[aindex] = new_node.name
                 new_node.tensor_meta["shape"] = getitem_node.tensor_meta[
                     "shape"
                 ]
@@ -63,4 +74,4 @@ def maxpool2d_simplify(graph: Graph):
                 for j, op in enumerate(graph.body):
                     if op == getitem_node:
                         graph.body[j] = new_node
-                        break
+                        break