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#include <caffe2/ideep/ideep_utils.h>
using namespace caffe2;
namespace {
void momentum_sgd_update(
const int N,
const float* g,
const float* m,
float* ng,
float* nm,
const float* lr,
const float momentum,
const bool nesterov,
float* param) {
const float LR = lr[0];
#ifdef _OPENMP
#pragma omp parallel for schedule(static)
#endif
for (auto i = 0; i < N; ++i) {
if (!nesterov) {
const float adjusted_gradient = LR * g[i] + momentum * m[i];
nm[i] = adjusted_gradient;
ng[i] = adjusted_gradient;
} else {
const float mi = m[i];
const float mi_new = momentum * mi + LR * g[i];
nm[i] = mi_new;
ng[i] = (1 + momentum) * mi_new - momentum * mi;
}
if (param) {
param[i] -= ng[i];
}
}
}
class IDEEPMomentumSGDOp final : public IDEEPOperator {
public:
USE_IDEEP_DEF_ALIASES();
USE_IDEEP_OPERATOR_FUNCTIONS();
IDEEPMomentumSGDOp(const OperatorDef& operator_def, Workspace* ws)
: IDEEPOperator(operator_def, ws),
momentum_(OperatorBase::GetSingleArgument<float>("momentum", 0.0)),
nesterov_(OperatorBase::GetSingleArgument<int>("nesterov", 0)) {}
bool RunOnDevice() override {
CAFFE_ENFORCE(Input(GRAD).get_nelems() == Input(MOMENTUM).get_nelems());
if (Input(GRAD) != *Output(OUTPUT_GRAD)) {
Output(OUTPUT_GRAD)->init(Input(GRAD).get_descriptor());
}
if (Input(MOMENTUM) != *Output(OUTPUT_MOMENTUM)) {
Output(OUTPUT_MOMENTUM)->init(Input(MOMENTUM).get_descriptor());
}
// TODO: Use itensor after 0-dim is supported. Now use CPU tensor.
const auto& lr = OperatorBase::Input<TensorCPU>(LR, CPU);
CAFFE_ENFORCE(lr.numel() == 1);
momentum_sgd_update(
Input(GRAD).get_nelems(),
static_cast<float*>(Input(GRAD).get_data_handle()),
static_cast<float*>(Input(MOMENTUM).get_data_handle()),
static_cast<float*>(Output(OUTPUT_GRAD)->get_data_handle()),
static_cast<float*>(Output(OUTPUT_MOMENTUM)->get_data_handle()),
lr.template data<float>(),
momentum_,
nesterov_,
nullptr);
return true;
}
protected:
// NOLINTNEXTLINE(cppcoreguidelines-avoid-magic-numbers,cppcoreguidelines-non-private-member-variables-in-classes)
float momentum_ = 0.9f;
// NOLINTNEXTLINE(cppcoreguidelines-non-private-member-variables-in-classes)
bool nesterov_;
INPUT_TAGS(GRAD, MOMENTUM, LR);
OUTPUT_TAGS(OUTPUT_GRAD, OUTPUT_MOMENTUM);
};
class IDEEPMomentumSGDUpdateOp final : public IDEEPOperator {
public:
USE_IDEEP_DEF_ALIASES();
USE_IDEEP_OPERATOR_FUNCTIONS();
IDEEPMomentumSGDUpdateOp(const OperatorDef& operator_def, Workspace* ws)
: IDEEPOperator(operator_def, ws),
momentum_(OperatorBase::GetSingleArgument<float>("momentum", 0.0)),
nesterov_(OperatorBase::GetSingleArgument<int>("nesterov", 0)) {}
bool RunOnDevice() override {
CAFFE_ENFORCE(Input(GRAD).get_nelems() == Input(MOMENTUM).get_nelems());
if (Input(GRAD) != *Output(OUTPUT_GRAD)) {
Output(OUTPUT_GRAD)->init(Input(GRAD).get_descriptor());
}
if (Input(MOMENTUM) != *Output(OUTPUT_MOMENTUM)) {
Output(OUTPUT_MOMENTUM)->init(Input(MOMENTUM).get_descriptor());
}
// TODO: Use itensor after 0-dim is supported. Now use CPU tensor.
const auto& lr = OperatorBase::Input<TensorCPU>(LR, CPU);
CAFFE_ENFORCE(lr.numel() == 1);
momentum_sgd_update(
Input(GRAD).get_nelems(),
static_cast<float*>(Input(GRAD).get_data_handle()),
static_cast<float*>(Input(MOMENTUM).get_data_handle()),
static_cast<float*>(Output(OUTPUT_GRAD)->get_data_handle()),
static_cast<float*>(Output(OUTPUT_MOMENTUM)->get_data_handle()),
lr.template data<float>(),
momentum_,
nesterov_,
static_cast<float*>(Output(OUTPUT_PARAM)->get_data_handle()));
return true;
}
protected:
// NOLINTNEXTLINE(cppcoreguidelines-avoid-magic-numbers,cppcoreguidelines-non-private-member-variables-in-classes)
float momentum_ = 0.9f;
// NOLINTNEXTLINE(cppcoreguidelines-non-private-member-variables-in-classes)
bool nesterov_;
INPUT_TAGS(GRAD, MOMENTUM, LR, PARAM);
OUTPUT_TAGS(OUTPUT_GRAD, OUTPUT_MOMENTUM, OUTPUT_PARAM);
};
REGISTER_IDEEP_OPERATOR(MomentumSGD, IDEEPMomentumSGDOp);
REGISTER_IDEEP_OPERATOR(MomentumSGDUpdate, IDEEPMomentumSGDUpdateOp);
} // namespace
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