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44cc873fba
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/56830 Opt into formatting on GitHub and format everything. This is a trial run before turning on formatting for more and eventually all of the codebase. Test Plan: CI Reviewed By: zertosh Differential Revision: D27979080 fbshipit-source-id: a80f0c48691c08ae8ca0af06377b87e6a2351151
93 lines
2.6 KiB
C++
93 lines
2.6 KiB
C++
#include <c10/core/GeneratorImpl.h>
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#include <chrono>
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#include <random>
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#ifndef _WIN32
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#include <fcntl.h>
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#include <unistd.h>
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#endif
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namespace c10 {
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/**
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* GeneratorImpl class implementation
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*/
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GeneratorImpl::GeneratorImpl(Device device_in, DispatchKeySet key_set)
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: device_{device_in}, key_set_(key_set) {}
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/**
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* Clone this generator. Note that clone() is the only
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* method for copying for Generators in ATen.
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*/
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c10::intrusive_ptr<GeneratorImpl> GeneratorImpl::clone() const {
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auto res = this->clone_impl();
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c10::raw::intrusive_ptr::incref(res);
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return c10::intrusive_ptr<GeneratorImpl>::reclaim(res);
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}
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/**
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* Gets the device of a generator.
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*/
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Device GeneratorImpl::device() const {
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return device_;
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}
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namespace detail {
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/**
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* Gets a random number for /dev/urandom
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* Note this is a legacy method (from THRandom.cpp)
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* FIXME: use std::random_device with entropy information
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*/
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#ifndef _WIN32
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static uint64_t readURandomLong() {
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int randDev = open("/dev/urandom", O_RDONLY);
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// NOLINTNEXTLINE(cppcoreguidelines-init-variables)
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uint64_t randValue;
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TORCH_CHECK(randDev >= 0, "Unable to open /dev/urandom");
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ssize_t readBytes = read(randDev, &randValue, sizeof(randValue));
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TORCH_CHECK(
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readBytes >= (ssize_t)sizeof(randValue),
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"Unable to read from /dev/urandom");
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close(randDev);
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return randValue;
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}
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#endif // _WIN32
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/**
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* Gets a non deterministic random number number from either the
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* /dev/urandom or the current time. For CUDA, gets random from
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* std::random_device and adds a transformation on it.
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*
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* FIXME: The behavior in this function is from legacy code
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* (THRandom_seed/THCRandom_seed) and is probably not the right thing to do,
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* even though our tests pass. Figure out if tests get perturbed
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* - when the same algorithm is used for all backends. Note that the current
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* behavior is different for CPU, CUDA and Windows CPU.
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* - when using C++11 std objects, such as std::random_device
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* - when constructing a 64 bit seed properly, rather than static casting
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* a 32 bit number to 64 bit.
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*/
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uint64_t getNonDeterministicRandom(bool is_cuda) {
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// NOLINTNEXTLINE(cppcoreguidelines-init-variables)
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uint64_t s;
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if (!is_cuda) {
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#ifdef _WIN32
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s = (uint64_t)std::chrono::high_resolution_clock::now()
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.time_since_epoch()
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.count();
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#else
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s = readURandomLong();
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#endif
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} else {
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std::random_device rd;
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// limit to 53 bits to ensure unique representation in double
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// NOLINTNEXTLINE(cppcoreguidelines-avoid-magic-numbers)
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s = ((((uint64_t)rd()) << 32) + rd()) & 0x1FFFFFFFFFFFFF;
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}
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return s;
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}
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} // namespace detail
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} // namespace c10
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