DPCT1033

Intel® DPC++ Compatibility Tool Developer Guide and Reference

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ID 768918

Date 11/07/2023

Version

Public

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DPCT1033

Message

Migrated code uses a basic Sobol generator. Initialize oneapi::mkl::rng::sobol generator with user-defined direction numbers to use it as Scrambled Sobol generator.

Detailed Help

Intel® oneAPI Math Kernel Library (oneMKL) RNG currently does not support Scrambled Sobol generator by default.

Migrated code uses a basic Sobol generator.

Suggestions to Fix

Set user-defined direction numbers to the basic Sobol generator and use it as Scrambled Sobol generator.

See the Random Number Generators topic for more information.

For example, this original CUDA* code:

void foo(){
  ...
  curandGenerator_t rng;
  curandCreateGenerator(&rng, CURAND_RNG_QUASI_SCRAMBLED_SOBOL32);
  curandSetQuasiRandomGeneratorDimensions(rng, 1234);
}

results in the following migrated SYCL* code:

void foo(){
  ...
  dpct::rng::host_rng_ptr rng;
  /*
  DPCT1033:0: Migrated code uses a basic Sobol generator. Initialize
  oneapi::mkl::rng::sobol generator with user-defined direction numbers to use
  it as Scrambled Sobol generator.
  */
  rng = dpct::rng::create_host_rng(dpct::rng::random_engine_type::sobol);
  rng->set_dimensions(1234);
}

which is rewritten to:

void foo(){
  ...
  dpct::rng::host_rng_ptr rng;
  rng = dpct::rng::create_host_rng(dpct::rng::random_engine_type::sobol);
  rng->set_direction_numbers(direction_numbers /*Use user-defined direction numbers*/);
}

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Intel® DPC++ Compatibility Tool Developer Guide and Reference

DPCT1033

Message

Detailed Help

Suggestions to Fix