forked from huawei/mindspore2022
75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
/**
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* Copyright 2019 Huawei Technologies Co., Ltd
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MINDSPORE_CCSRC_MINDDATA_DATASET_UTIL_RANDOM_H_
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#define MINDSPORE_CCSRC_MINDDATA_DATASET_UTIL_RANDOM_H_
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#if defined(_WIN32) || defined(_WIN64)
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#include <stdlib.h>
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#endif
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#include <chrono>
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#include <limits>
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#include <memory>
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#include <random>
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#include <string>
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#include <thread>
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#include "minddata/dataset/core/config_manager.h"
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#include "minddata/dataset/core/global_context.h"
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#include "utils/log_adapter.h"
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namespace mindspore {
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namespace dataset {
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inline std::mt19937 GetRandomDevice() {
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#if defined(_WIN32) || defined(_WIN64)
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unsigned int number;
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rand_s(&number);
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std::mt19937 random_device{static_cast<uint32_t>(number)};
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#else
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int i = 0;
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while (i < 5) {
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try {
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std::mt19937 random_device{std::random_device("/dev/urandom")()};
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return random_device;
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} catch (const std::exception &e) {
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MS_LOG(WARNING) << "Get std::random_device failed, retry: " << i << ", error: " << e.what();
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std::this_thread::sleep_for(std::chrono::milliseconds(10));
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i++;
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}
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}
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std::mt19937 random_device{std::random_device("/dev/urandom")()};
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#endif
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return random_device;
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}
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inline uint32_t GetNewSeed() {
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std::mt19937 random_device = GetRandomDevice();
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std::uniform_int_distribution<uint32_t> distribution(0, std::numeric_limits<uint32_t>::max());
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return distribution(random_device);
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}
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inline uint32_t GetSeed() {
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uint32_t seed = GlobalContext::config_manager()->seed();
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if (seed == std::mt19937::default_seed) {
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seed = GetNewSeed();
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}
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return seed;
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}
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} // namespace dataset
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} // namespace mindspore
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#endif // MINDSPORE_CCSRC_MINDDATA_DATASET_UTIL_RANDOM_H_
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