fix data load.

Author: trivialfis

python-package/xgboost/testing/__init__.py

@@ -14,6 +14,7 @@
 from concurrent.futures import ThreadPoolExecutor
 from contextlib import contextmanager
 from io import StringIO
+from pathlib import Path
 from platform import system
 from typing import (
     Any,
@@ -462,9 +463,9 @@ def get_mq2008(
         qid_valid,
     ) = load_svmlight_files(
         (
-            dpath + "MQ2008/Fold1/train.txt",
-            dpath + "MQ2008/Fold1/test.txt",
-            dpath + "MQ2008/Fold1/vali.txt",
+            Path(dpath) / "MQ2008" / "Fold1" / "train.txt",
+            Path(dpath) / "MQ2008" / "Fold1" / "test.txt",
+            Path(dpath) / "MQ2008" / "Fold1" / "vali.txt",
         ),
         query_id=True,
         zero_based=False,

src/objective/init_estimation.h

@@ -7,8 +7,7 @@
 #include "xgboost/linalg.h"     // Tensor
 #include "xgboost/objective.h"  // ObjFunction
 
-namespace xgboost {
-namespace obj {
+namespace xgboost::obj {
 class FitIntercept : public ObjFunction {
   void InitEstimation(MetaInfo const& info, linalg::Vector<float>* base_score) const override;
 };
@@ -20,6 +19,5 @@ inline void CheckInitInputs(MetaInfo const& info) {
         << "Number of weights should be equal to number of data points.";
   }
 }
-}  // namespace obj
-}  // namespace xgboost
+}  // namespace xgboost::obj
 #endif  // XGBOOST_OBJECTIVE_INIT_ESTIMATION_H_