namespace to reduce code

src/metric/auc.cu

@@ -25,12 +25,6 @@
 #include "xgboost/data.h"
 #include "xgboost/span.h"
 
-#if defined(XGBOOST_USE_HIP)
-namespace thrust {
-    namespace cuda = thrust::hip;
-}
-#endif
-
 namespace xgboost {
 namespace metric {
 // tag the this file, used by force static link later.

src/metric/elementwise_metric.cu

@@ -30,12 +30,6 @@
 #include "../common/device_helpers.cuh"
 #endif  // defined(XGBOOST_USE_CUDA) || defined(XGBOOST_USE_HIP)
 
-#if defined(XGBOOST_USE_HIP)
-namespace thrust {
-    namespace cuda = thrust::hip;
-}
-#endif
-
 namespace xgboost {
 namespace metric {
 // tag the this file, used by force static link later.

src/metric/multiclass_metric.cu

@@ -24,12 +24,6 @@
 #include "../common/device_helpers.cuh"
 #endif  // XGBOOST_USE_CUDA || XGBOOST_USE_HIP
 
-#if defined(XGBOOST_USE_HIP)
-namespace thrust {
-    namespace cuda = thrust::hip;
-}
-#endif
-
 namespace xgboost {
 namespace metric {
 // tag the this file, used by force static link later.

src/metric/rank_metric.cu

@@ -26,8 +26,6 @@
 
 #if defined(XGBOOST_USE_HIP)
 #include <hipcub/hipcub.hpp>
-
-namespace cub = hipcub;
 #endif
 
 namespace xgboost::metric {

src/metric/survival_metric.cu

@@ -25,12 +25,6 @@
 #include "../common/device_helpers.cuh"
 #endif  // XGBOOST_USE_CUDA || XGBOOST_USE_HIP
 
-#if defined(XGBOOST_USE_HIP)
-namespace thrust {
-    namespace cuda = thrust::hip;
-}
-#endif
-
 using AFTParam = xgboost::common::AFTParam;
 using ProbabilityDistributionType = xgboost::common::ProbabilityDistributionType;
 template <typename Distribution>