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/*! \file */
/* ************************************************************************
* Copyright (C) 2019-2022 Advanced Micro Devices, Inc. All rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* ************************************************************************ */
#pragma once
#ifndef ROCSPARSE_RANDOM_HPP
#define ROCSPARSE_RANDOM_HPP
#include "rocsparse_math.hpp"
#include <random>
#include <type_traits>
/* ==================================================================================== */
// Random number generator
using rocsparse_rng_t = std::mt19937;
void rocsparse_rng_set(rocsparse_rng_t a);
void rocsparse_seed_set(rocsparse_rng_t a);
void rocsparse_rng_nan_set(rocsparse_rng_t a);
rocsparse_rng_t& rocsparse_rng_get();
rocsparse_rng_t& rocsparse_seed_get();
rocsparse_rng_t& rocsparse_rng_nan_get();
// extern rocsparse_rng_t rocsparse_rng, rocsparse_seed, rocsparse_rng_nan;
// Reset the seed (mainly to ensure repeatability of failures in a given suite)
inline void rocsparse_seedrand()
{
rocsparse_rng_set(rocsparse_seed_get());
rocsparse_rng_nan_set(rocsparse_seed_get());
}
/* ==================================================================================== */
/*! \brief Random number generator which generates NaN values */
class rocsparse_nan_rng
{
// Generate random NaN values
template <typename T, typename UINT_T, int SIG, int EXP>
static T random_nan_data()
{
static_assert(sizeof(UINT_T) == sizeof(T), "Type sizes do not match");
union u_t
{
u_t() {}
UINT_T u;
T fp;
} x;
do
x.u = std::uniform_int_distribution<UINT_T>{}(rocsparse_rng_nan_get());
while(!(x.u & (((UINT_T)1 << SIG) - 1))); // Reject Inf (mantissa == 0)
x.u |= (((UINT_T)1 << EXP) - 1) << SIG; // Exponent = all 1's
return x.fp; // NaN with random bits
}
public:
// Random integer
template <typename T, typename std::enable_if<std::is_integral<T>{}, int>::type = 0>
explicit operator T()
{
return std::uniform_int_distribution<T>{}(rocsparse_rng_nan_get());
}
// Random NaN double
explicit operator double()
{
return random_nan_data<double, uint64_t, 52, 11>();
}
// Random NaN float
explicit operator float()
{
return random_nan_data<float, uint32_t, 23, 8>();
}
explicit operator rocsparse_float_complex()
{
return {float(*this), float(*this)};
}
explicit operator rocsparse_double_complex()
{
return {double(*this), double(*this)};
}
};
/* ==================================================================================== */
/* generate random number :*/
/*! \brief generate a random number in range [a,b] */
template <typename T>
inline T random_generator_exact(int a = 1, int b = 10)
{
return std::uniform_int_distribution<int>(a, b)(rocsparse_rng_get());
}
template <>
inline rocsparse_float_complex random_generator_exact<rocsparse_float_complex>(int a, int b)
{
return rocsparse_float_complex(random_generator_exact<float>(a, b),
random_generator_exact<float>(a, b));
}
template <>
inline rocsparse_double_complex random_generator_exact<rocsparse_double_complex>(int a, int b)
{
return rocsparse_double_complex(random_generator_exact<double>(a, b),
random_generator_exact<double>(a, b));
}
template <typename T, typename std::enable_if_t<std::is_integral<T>::value, bool> = true>
inline T random_generator(T a = static_cast<T>(1), T b = static_cast<T>(10))
{
return random_generator_exact<T>(a, b);
}
template <typename T, typename std::enable_if_t<!std::is_integral<T>::value, bool> = true>
inline T random_generator(T a = static_cast<T>(0), T b = static_cast<T>(1))
{
return std::uniform_real_distribution<T>(a, b)(rocsparse_rng_get());
}
template <>
inline rocsparse_float_complex random_generator<rocsparse_float_complex>(rocsparse_float_complex a,
rocsparse_float_complex b)
{
float theta = random_generator<float>(0.0f, 2.0f * acos(-1.0f));
float r = random_generator<float>(std::abs(a), std::abs(b));
return rocsparse_float_complex(r * cos(theta), r * sin(theta));
}
template <>
inline rocsparse_double_complex
random_generator<rocsparse_double_complex>(rocsparse_double_complex a,
rocsparse_double_complex b)
{
double theta = random_generator<double>(0.0, 2.0 * acos(-1.0));
double r = random_generator<double>(std::abs(a), std::abs(b));
return rocsparse_double_complex(r * cos(theta), r * sin(theta));
}
/*! \brief generate a random normally distributed number around 0 with stddev 1 */
template <typename T>
inline T random_generator_normal()
{
return std::normal_distribution<T>(0.0, 1.0)(rocsparse_rng_get());
}
#endif // ROCSPARSE_RANDOM_HPP
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