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#pragma once
#include <cstdlib>
#include <ctime>
#include <random>
#include <caffe2/core/context.h>
namespace caffe2 {
class IDEEPContext final : public BaseContext {
public:
typedef std::mt19937 rand_gen_type;
IDEEPContext() : random_seed_(RandomNumberSeed()) {}
explicit IDEEPContext(const DeviceOption& option)
: random_seed_(
option.has_random_seed() ? option.random_seed()
: RandomNumberSeed()) {
CAFFE_ENFORCE_EQ(option.device_type(), PROTO_IDEEP);
}
explicit IDEEPContext(const at::Device& device)
: IDEEPContext(DeviceToOption(device)) {}
~IDEEPContext() noexcept override {}
inline void SwitchToDevice(int64_t /*stream_id*/) {}
using BaseContext::SwitchToDevice;
inline void WaitEvent(const Event& ev) {
ev.Wait(IDEEP, this);
}
inline void Record(Event* ev, const char* err_msg = nullptr) const {
CAFFE_ENFORCE(ev, "Event must not be null.");
ev->Record(IDEEP, this, err_msg);
}
inline void FinishDeviceComputation() {}
inline rand_gen_type& RandGenerator() {
if (!random_generator_.get()) {
random_generator_.reset(new rand_gen_type(random_seed_));
}
return *random_generator_.get();
}
inline static at::DataPtr New(size_t nbytes) {
return GetAllocator(CPU)->allocate(nbytes);
}
void CopyBytesSameDevice(size_t nbytes, const void* src, void* dst) override {
if (nbytes == 0) {
return;
}
CAFFE_ENFORCE(src);
CAFFE_ENFORCE(dst);
memcpy(dst, src, nbytes);
}
void CopyBytesFromCPU(size_t nbytes, const void* src, void* dst) override {
CopyBytesSameDevice(nbytes, src, dst);
}
void CopyBytesToCPU(size_t nbytes, const void* src, void* dst) override {
CopyBytesSameDevice(nbytes, src, dst);
}
bool SupportsNonFundamentalTypes() const override {
// IDEEP meta copy is OK
return true;
}
// Two copy functions that deals with cross-device copies.
template <class SrcContext, class DstContext>
inline void CopyBytes(size_t nbytes, const void* src, void* dst);
template <typename T, class SrcContext, class DstContext>
inline void Copy(size_t n, const T* src, T* dst) {
if (c10::guts::is_fundamental<T>::value) {
CopyBytes<SrcContext, DstContext>(
n * sizeof(T),
static_cast<const void*>(src),
static_cast<void*>(dst));
} else {
for (const auto i : c10::irange(n)) {
dst[i] = src[i];
}
}
}
template <class SrcContext, class DstContext>
inline void
CopyItems(const TypeMeta meta, size_t n, const void* src, void* dst) {
if (meta.copy()) {
meta.copy()(src, dst, n);
} else {
CopyBytes<SrcContext, DstContext>(n * meta.itemsize(), src, dst);
}
}
static bool HasAsyncPartDefault() {
return false;
}
static bool SupportsAsyncScheduling() {
return false;
}
static bool IsStreamFree(const DeviceOption& /* unused */, int /* unused */) {
return true;
}
at::Device device() const override {
return at::Device(IDEEP);
}
DeviceType device_type() const override {
return IDEEP;
}
static constexpr DeviceType GetDeviceType() {
return IDEEP;
}
protected:
// TODO(jiayq): instead of hard-coding a generator, make it more flexible.
int random_seed_{1701};
std::unique_ptr<rand_gen_type> random_generator_;
};
template <>
inline void IDEEPContext::CopyBytes<IDEEPContext, IDEEPContext>(
size_t nbytes,
const void* src,
void* dst) {
if (nbytes == 0) {
return;
}
CAFFE_ENFORCE(src);
CAFFE_ENFORCE(dst);
memcpy(dst, src, nbytes);
}
template <>
inline void IDEEPContext::CopyBytes<CPUContext, IDEEPContext>(
size_t nbytes,
const void* src,
void* dst) {
if (nbytes == 0) {
return;
}
CAFFE_ENFORCE(src);
CAFFE_ENFORCE(dst);
memcpy(dst, src, nbytes);
}
template <>
inline void IDEEPContext::CopyBytes<IDEEPContext, CPUContext>(
size_t nbytes,
const void* src,
void* dst) {
if (nbytes == 0) {
return;
}
CAFFE_ENFORCE(src);
CAFFE_ENFORCE(dst);
memcpy(dst, src, nbytes);
}
} // namespace caffe2
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