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28 lines
850 B
C++
28 lines
850 B
C++
#include "caffe2/core/context.h"
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#include <atomic>
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#if defined(_MSC_VER)
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#include <process.h>
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#endif
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namespace caffe2 {
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uint32_t RandomNumberSeed() {
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// Originally copied from folly::randomNumberSeed (at 418ad4)
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// modified to use chrono instead of sys/time.h
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static std::atomic<uint32_t> seedInput(0);
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auto tv = std::chrono::system_clock::now().time_since_epoch();
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uint64_t usec = static_cast<uint64_t>(
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std::chrono::duration_cast<std::chrono::microseconds>(tv).count());
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uint32_t tv_sec = usec / 1000000;
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uint32_t tv_usec = usec % 1000000;
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const uint32_t kPrime0 = 51551;
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const uint32_t kPrime1 = 61631;
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const uint32_t kPrime2 = 64997;
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const uint32_t kPrime3 = 111857;
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return kPrime0 * (seedInput++) + kPrime1 * static_cast<uint32_t>(getpid()) +
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kPrime2 * tv_sec + kPrime3 * tv_usec;
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}
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} // namespace caffe2
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