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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
co-authored by Andy Adinets
parent e7d7ab6bc3
commit 7a1d67f9cb
11 changed files with 295 additions and 142 deletions
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tests/cpp/tree/gpu_hist/test_row_partitioner.cu
+5
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@@ -1,8 +1,13 @@
/*!
* Copyright 2019-2021 by XGBoost Contributors
*/
#include <gtest/gtest.h>
#include <vector>
#include <thrust/device_vector.h>
#include <thrust/host_vector.h>
#include <thrust/sequence.h>
#include "../../../../src/tree/gpu_hist/row_partitioner.cuh"
#include "../../helpers.h"