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Use thrust functions instead of custom functions (#5544)

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This commit is contained in:
Rory Mitchell
2020-04-16 21:41:16 +12:00
committed by GitHub
parent 6a169cd41a
commit e268fb0093
6 changed files with 82 additions and 306 deletions
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17
src/objective/rank_obj.cu
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@@ -52,14 +52,18 @@ struct LambdaRankParam : public XGBoostParameter<LambdaRankParam> {
template <typename T>
XGBOOST_DEVICE __forceinline__ uint32_t
CountNumItemsToTheLeftOf(const T * __restrict__ items, uint32_t n, T v) {
return dh::LowerBound(items, n, v, thrust::greater<T>());
CountNumItemsToTheLeftOf(const T *__restrict__ items, uint32_t n, T v) {
return thrust::lower_bound(thrust::seq, items, items + n, v,
thrust::greater<T>()) -
items;
}
template <typename T>
XGBOOST_DEVICE __forceinline__ uint32_t
CountNumItemsToTheRightOf(const T * __restrict__ items, uint32_t n, T v) {
return n - dh::UpperBound(items, n, v, thrust::greater<T>());
CountNumItemsToTheRightOf(const T *__restrict__ items, uint32_t n, T v) {
return n - (thrust::upper_bound(thrust::seq, items, items + n, v,
thrust::greater<T>()) -
items);
}
#endif
@@ -671,7 +675,10 @@ class SortedLabelList : dh::SegmentSorter<float> {
dh::LaunchN(device_id, niter, nullptr, [=] __device__(uint32_t idx) {
// First, determine the group 'idx' belongs to
uint32_t item_idx = idx % total_items;
uint32_t group_idx = dh::UpperBound(dgroups.data(), ngroups, item_idx);
uint32_t group_idx =
thrust::upper_bound(thrust::seq, dgroups.begin(),
dgroups.begin() + ngroups, item_idx) -
dgroups.begin();
// Span of this group within the larger labels/predictions sorted tuple
uint32_t group_begin = dgroups[group_idx - 1];
uint32_t group_end = dgroups[group_idx];