Fix 'get_attr' call in dynamo 'run_node' (pytorch#127696)

Fixes pytorch#124858

Pull Request resolved: pytorch#127696
Approved by: https://github.com/jansel
ghstack dependencies: pytorch#127695

Author: BowenBao

test/dynamo/test_decorators.py

@@ -465,6 +465,28 @@ def fn(a, b, c):
 
         self.assertEqual(cnt.frame_count, 1)
 
+    def test_assume_constant_result_on_user_defined_fn(self):
+        @torch._dynamo.assume_constant_result
+        def const_fn(n, s):
+            return torch.full([n], s)
+
+        def fn(B):
+            B = const_fn(B.size(0), 13)
+            X = B * 2
+            return X.tolist()
+
+        B_list = [8] * 32
+
+        B = torch.tensor(B_list, dtype=torch.int32)
+        torch._dynamo.decorators.mark_static(B, 0)
+
+        torch._dynamo.config.capture_scalar_outputs = True
+        torch._dynamo.config.capture_dynamic_output_shape_ops = True
+
+        self.assertEqual(
+            fn(B), torch.compile(fn, backend="eager", fullgraph=True, dynamic=True)(B)
+        )
+
 
 if __name__ == "__main__":
     from torch._dynamo.test_case import run_tests

torch/_dynamo/utils.py

@@ -1908,7 +1908,7 @@ def make_error_message(e):
                 assert nnmodule is not None
                 return nnmodule(*args, **kwargs)
             elif op == "get_attr":
-                return tracer.get_submodule(node.target)
+                return tracer.output_graph.get_submodule(node.target)
             elif op == "placeholder":
                 assert "example_value" in node.meta
                 return node.meta["example_value"]