80 lines
2.8 KiB
C++
80 lines
2.8 KiB
C++
/* Copyright 2015 The TensorFlow Authors. All Rights Reserved.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
==============================================================================*/
|
|
|
|
#ifndef TENSORFLOW_CORE_UTIL_GUARDED_PHILOX_RANDOM_H_
|
|
#define TENSORFLOW_CORE_UTIL_GUARDED_PHILOX_RANDOM_H_
|
|
|
|
#include "philox_random.h"
|
|
//#include <tensorflow/core/platform/mutex.h>
|
|
//#include <tensorflow/core/platform/default/mutex.h>
|
|
#include <tensorflow/core/platform/macros.h>
|
|
#include <tensorflow/core/platform/types.h>
|
|
|
|
namespace tensorflow {
|
|
|
|
// A thread safe wrapper around a Philox generator. Example usage:
|
|
//
|
|
// GuardedRandomPhilox generator;
|
|
// generator.Init(context);
|
|
//
|
|
// // In thread safe code
|
|
// const int samples = ...;
|
|
// auto local_generator = generator.ReserveSamples128(samples);
|
|
// for (int i = 0; i < samples; i++)
|
|
// Array<uint32, 4> sample = local_generator();
|
|
// // Use sample
|
|
// }
|
|
//
|
|
class GuardedPhiloxRandom {
|
|
public:
|
|
// Must call Init to finish initialization
|
|
GuardedPhiloxRandom() : initialized_(false) {}
|
|
|
|
// Initialize the generator from attributes "seed" and "seed2".
|
|
// If both seeds are unspecified, use random seeds.
|
|
// Must be called exactly once.
|
|
|
|
// Initialize with given seeds.
|
|
void Init(int64 seed, int64 seed2);
|
|
void Init(random::PhiloxRandom::ResultType counter, random::PhiloxRandom::Key key);
|
|
|
|
// Reserve a certain number of 128-bit samples.
|
|
// This function is thread safe. The returned generator is valid for the
|
|
// given number of samples, and can be used without a lock.
|
|
random::PhiloxRandom ReserveSamples128(int64 samples);
|
|
|
|
// Reserve a certain number of 32-bit samples.
|
|
random::PhiloxRandom ReserveSamples32(int64 samples) {
|
|
return ReserveSamples128((samples + 3) / 4);
|
|
}
|
|
|
|
// Reserve enough random samples in the generator for the given output count.
|
|
random::PhiloxRandom ReserveRandomOutputs(int64 output_count, int multiplier) {
|
|
int64 conservative_sample_count = output_count * multiplier;
|
|
return ReserveSamples128(conservative_sample_count);
|
|
}
|
|
|
|
private:
|
|
// mutex mu_;
|
|
random::PhiloxRandom generator_; // GUARDED_BY(mu_);
|
|
bool initialized_;
|
|
|
|
TF_DISALLOW_COPY_AND_ASSIGN(GuardedPhiloxRandom);
|
|
};
|
|
|
|
} // namespace tensorflow
|
|
|
|
#endif // TENSORFLOW_CORE_UTIL_GUARDED_PHILOX_RANDOM_H_
|