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#ifndef TENSORFLOW_STREAM_EXECUTOR_RNG_H_
#define TENSORFLOW_STREAM_EXECUTOR_RNG_H_
#include <limits.h>
#include <complex>
#include "tensorflow/stream_executor/platform/logging.h"
#include "tensorflow/stream_executor/platform/port.h"
namespace perftools {
namespace gputools {
class Stream;
template <typename ElemT>
class DeviceMemory;
namespace rng {
// Random-number-generation support interface -- this can be derived from a GPU
// executor when the underlying platform has an RNG library implementation
// available. See StreamExecutor::AsRng().
// When a seed is not specified, the backing RNG will be initialized with the
// default seed for that implementation.
//
// Thread-hostile: see StreamExecutor class comment for details on
// thread-hostility.
class RngSupport {
public:
static const int kMinSeedBytes = 16;
static const int kMaxSeedBytes = INT_MAX;
// Releases any random-number-generation resources associated with this
// support object in the underlying platform implementation.
virtual ~RngSupport() {}
// Populates a GPU memory allocation with random values appropriate for the
// DeviceMemory element type; i.e. populates DeviceMemory<float> with random
// float values.
virtual bool DoPopulateRandUniform(Stream *stream,
DeviceMemory<float> *v) = 0;
virtual bool DoPopulateRandUniform(Stream *stream,
DeviceMemory<double> *v) = 0;
virtual bool DoPopulateRandUniform(Stream *stream,
DeviceMemory<std::complex<float>> *v) = 0;
virtual bool DoPopulateRandUniform(Stream *stream,
DeviceMemory<std::complex<double>> *v) = 0;
// Populates a GPU memory allocation with random values sampled from a
// Gaussian distribution with the given mean and standard deviation.
virtual bool DoPopulateRandGaussian(Stream *stream, float mean, float stddev,
DeviceMemory<float> *v) {
LOG(ERROR)
<< "platform's random number generator does not support gaussian";
return false;
}
virtual bool DoPopulateRandGaussian(Stream *stream, double mean,
double stddev, DeviceMemory<double> *v) {
LOG(ERROR)
<< "platform's random number generator does not support gaussian";
return false;
}
// Specifies the seed used to initialize the RNG.
// This call does not transfer ownership of the buffer seed; its data should
// not be altered for the lifetime of this call. At least 16 bytes of seed
// data must be provided, but not all seed data will necessarily be used.
// seed: Pointer to seed data. Must not be null.
// seed_bytes: Size of seed buffer in bytes. Must be >= 16.
virtual bool SetSeed(Stream *stream, const uint8 *seed,
uint64 seed_bytes) = 0;
protected:
static bool CheckSeed(const uint8 *seed, uint64 seed_bytes);
};
} // namespace rng
} // namespace gputools
} // namespace perftools
#endif // TENSORFLOW_STREAM_EXECUTOR_RNG_H_
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