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C++ GPU evaluation causing seg fault. #1923

@caiowakamatsuahrefs

Description

@caiowakamatsuahrefs

Problem: I am using wrapped_calcer.h and attempting to enable GPU evaluation. But upon running this I get a segfault within CatBoost.

(The segfault occurs in the CalcFlat call)

#include <iostream>
#include <array>
#include <random>
#include <algorithm>

#include "contrib/catboost/wrapped_calcer.h"

int main() 
{
  std::mt19937 generator (0);
  std::uniform_real_distribution<float> dis(0, 100);

  auto data = std::vector<float>();
  for (int i = 0; i < 100; i++)
    data.push_back(dis(generator));

  auto scorer = ModelCalcerWrapper("model.bin");
  scorer.EnableGPUEvaluation();
  auto score = scorer.CalcFlat(data);
  std::cout << score << std::endl;
}

catboost version: v1.0.0
Operating System: Debian GNU/Linux 10 (buster)
CPU: Intel(R) Xeon(R) Gold 6226R
GPU: 4x NVIDIA Tesla V100S

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