fix(utils/network): fix replace oprs

GitOrigin-RevId: eba27e3dfb2603b185279ac6120d1dea69673bf7

imperative/python/megengine/utils/network.py

@@ -399,6 +399,7 @@ class Network:
                     var.owner = repl_dict[opr]
                     var.__dict__.update(repl_dict[opr].outputs[ind].__dict__)
                     var.var = repl_dict[opr].outputs[ind].var
+                repl_dict[opr].outputs = opr.outputs
         self._compile()
 
     def get_opr_by_type(self, oprcls, unique=True):

imperative/python/test/unit/utils/test_network.py

@@ -119,8 +119,16 @@ def test_replace_opr():
     out1 = graph.add_dep_oprs(out1)
     orig_opr = graph.opr_filter.has_input(vara).as_unique()
 
-    repl_dict = {orig_opr: out1[0].owner}
+    new_opr = out1[0].owner
+    repl_dict = {orig_opr: new_opr}
     graph.replace_oprs(repl_dict)
+
+    var_out = orig_opr.outputs
+
+    for idx, node in enumerate(var_out):
+        assert node.owner is new_opr
+        assert node.owner.outputs[idx] is node
+
     modified_model1 = io.BytesIO()
     graph.dump(modified_model1)
     modified_model1.seek(0)