fix memory leak problen of set_value op (PaddlePaddle#38098)

* fix bug of set_value op

* fix BumpInplaceVersion

* polish some comments

* revert change of full_like

paddle/fluid/pybind/imperative.cc

@@ -970,6 +970,11 @@ void BindImperative(py::module *m_ptr) {
               }
             };
 
+            // NOTE(liym27):
+            // Increase the version of VarBase self because __setitem__ is an
+            // inplace operator for the VarBase self.
+            self->BumpInplaceVersion();
+
             // 1. Check argumnets
             bool parse_index = true;
 
@@ -1137,10 +1142,6 @@ void BindImperative(py::module *m_ptr) {
               SetTensorFromPyArray(self_tensor, self_numpy,
                                    self_tensor->place(), false);
             }
-            // NOTE(liym27):
-            // Increase the version of VarBase self because __setitem__ is an
-            // inplace operator for the VarBase self.
-            self->BumpInplaceVersion();
           })
       .def("_getitem_index_not_tensor",
            [](std::shared_ptr<imperative::VarBase> &self, py::handle _index) {