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void check_error(cudaError_t status);
cublasHandle_t blas_handle();
void cuda_push_array(float *x_gpu, float *x, size_t n);
void cuda_pull_array(float *x_gpu, float *x, size_t n);
void cuda_random(float *x_gpu, size_t n);
float cuda_compare(float *x_gpu, float *x, size_t n, char *s);
float cuda_mag_array(float *x_gpu, size_t n);