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[breaking] Use integer atomic for GPU histogram. (#7180)

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On GPU we use rouding factor to truncate the gradient for deterministic results. This PR changes the gradient representation to fixed point number with exponent aligned with rounding factor.

    [breaking] Drop non-deterministic histogram.
    Use fixed point for shared memory.

This PR is to improve the performance of GPU Hist. 

Co-authored-by: Andy Adinets <aadinets@nvidia.com>
This commit is contained in:
Jiaming Yuan
2021-08-28 05:17:05 +08:00
committed by GitHub
parent e7d7ab6bc3
commit 7a1d67f9cb
11 changed files with 295 additions and 142 deletions
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6
tests/cpp/objective/test_ranking_obj_gpu.cu
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@@ -1,5 +1,9 @@
#include "test_ranking_obj.cc"
/*!
* Copyright 2019-2021 by XGBoost Contributors
*/
#include <thrust/host_vector.h>
#include "test_ranking_obj.cc"
#include "../../../src/objective/rank_obj.cu"
namespace xgboost {