From 2140295510eaa42880cb613272b553da9a8b6f60 Mon Sep 17 00:00:00 2001
From: Jiaming Yuan <jm.yuan@outlook.com>
Date: Thu, 4 Jan 2024 01:02:15 +0800
Subject: [PATCH] Save model in ubj as the default.

---
 src/c_api/c_api.cc | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/c_api/c_api.cc b/src/c_api/c_api.cc
index 9aedcef2e855..9916a881a22d 100644
--- a/src/c_api/c_api.cc
+++ b/src/c_api/c_api.cc
@@ -1339,14 +1339,14 @@ XGB_DLL int XGBoosterSaveModel(BoosterHandle handle, const char *fname) {
     save_json(std::ios::out);
   } else if (common::FileExtension(fname) == "ubj") {
     save_json(std::ios::binary);
-  } else if (XGBOOST_VER_MAJOR == 2 && XGBOOST_VER_MINOR >= 2) {
-    LOG(WARNING) << "Saving model to JSON as default.  You can use file extension `json`, `ubj` or "
-                    "`deprecated` to choose between formats.";
-    save_json(std::ios::out);
-  } else {
+  } else if (common::FileExtension(fname) == "deprecated") {
     WarnOldModel();
     auto *bst = static_cast<Learner *>(handle);
     bst->SaveModel(fo.get());
+  } else {
+    LOG(WARNING) << "Saving model in the UBJSON format as default.  You can use file extension:"
+                    " `json`, `ubj` or `deprecated` to choose between formats.";
+    save_json(std::ios::binary);
   }
   API_END();
 }