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-rw-r--r--arm_compute/core/utils/misc/Random.h98
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diff --git a/arm_compute/core/utils/misc/Random.h b/arm_compute/core/utils/misc/Random.h
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--- a/arm_compute/core/utils/misc/Random.h
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-/*
- * Copyright (c) 2019 ARM Limited.
- *
- * SPDX-License-Identifier: MIT
- *
- * 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.
- */
-#ifndef ARM_COMPUTE_MISC_RANDOM_H
-#define ARM_COMPUTE_MISC_RANDOM_H
-
-#include "arm_compute/core/Error.h"
-
-#include <random>
-#include <type_traits>
-
-namespace arm_compute
-{
-namespace utils
-{
-namespace random
-{
-/** Uniform distribution within a given number of sub-ranges
- *
- * @tparam T Distribution primitive type
- */
-template <typename T>
-class RangedUniformDistribution
-{
-public:
- using DT = typename std::conditional<std::is_integral<T>::value,
- std::uniform_int_distribution<T>,
- std::uniform_real_distribution<float>>::type;
- using result_type = T;
- using range_pair = std::pair<result_type, result_type>;
-
-public:
- /** Constructor
- *
- * @param[in] low lowest value in the range (inclusive)
- * @param[in] high highest value in the range (inclusive for uniform_int_distribution, exclusive for uniform_real_distribution)
- * @param[in] exclude_ranges Ranges to exclude from the generator
- */
- RangedUniformDistribution(result_type low, result_type high, const std::vector<range_pair> &exclude_ranges)
- : _distributions(), _selector()
- {
- result_type clow = low;
- for(const auto &erange : exclude_ranges)
- {
- result_type epsilon = std::is_integral<result_type>::value ? 1 : static_cast<result_type>(std::numeric_limits<float>::epsilon());
-
- ARM_COMPUTE_ERROR_ON(clow > erange.first || clow >= erange.second);
-
- _distributions.emplace_back(DT(clow, erange.first - epsilon));
- clow = erange.second + epsilon;
- }
- ARM_COMPUTE_ERROR_ON(clow > high);
- _distributions.emplace_back(DT(clow, high));
- _selector = std::uniform_int_distribution<uint32_t>(0, _distributions.size() - 1);
- }
- /** Generate random number
- *
- * @tparam URNG Random number generator object type
- *
- * @param[in] g A uniform random number generator object, used as the source of randomness.
- *
- * @return A new random number.
- */
- template <class URNG>
- result_type operator()(URNG &g)
- {
- unsigned int rand_select = _selector(g);
- return _distributions[rand_select](g);
- }
-
-private:
- std::vector<DT> _distributions;
- std::uniform_int_distribution<uint32_t> _selector;
-};
-} // namespace random
-} // namespace utils
-} // namespace arm_compute
-#endif /* ARM_COMPUTE_MISC_RANDOM_H */