for inference checkpoint (#30081)

* for inference checkpoint

Change-Id: I36c979240ffa55bf1ef0c9315402960762af6be4

* for inference checkpoint

Change-Id: I82025365d5b792cbea1ead506df685aecc8ac198

paddle/fluid/operators/lookup_table_op.cc

@@ -17,6 +17,7 @@ limitations under the License. */
 #include <memory>
 
 #include "paddle/fluid/framework/no_need_buffer_vars_inference.h"
+#include "paddle/fluid/framework/op_version_registry.h"
 #include "paddle/fluid/framework/var_type_inference.h"
 
 namespace paddle {
@@ -224,3 +225,16 @@ REGISTER_OP_CPU_KERNEL(lookup_table, ops::LookupTableKernel<float>,
                        ops::LookupTableKernel<int8_t>);
 REGISTER_OP_CPU_KERNEL(lookup_table_grad, ops::LookupTableGradKernel<float>,
                        ops::LookupTableGradKernel<double>);
+
+/* ==========================  register checkpoint ===========================*/
+
+REGISTER_OP_VERSION(lookup_table)
+    .AddCheckpoint(
+        R"ROC(
+      Upgrade lookup_table add 1 attribute [entry_config].
+    )ROC",
+        paddle::framework::compatible::OpVersionDesc().NewAttr(
+            "entry_config",
+            "(std::string) embedding sparse feature entry config.", ""));
+
+/* ========================================================================== */