add save model to proto util

fleetrec/core/utils/util.py

@@ -16,9 +16,20 @@ import os
 import time
 import datetime
 
+from paddle import fluid
 from fleetrec.core.utils import fs as fs
 
 
+def save_program_proto(path, program=None):
+    if program is None:
+        _program = fluid.default_main_program()
+    else:
+        _program = program
+
+    with open(path, "wb") as f:
+        f.write(_program.desc.serialize_to_string())
+
+
 def str2bool(v):
     if isinstance(v, bool):
         return v