forked from pytorch/pytorch
-
Notifications
You must be signed in to change notification settings - Fork 0
/
learning_rate_op.h
264 lines (255 loc) · 11.6 KB
/
learning_rate_op.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
#ifndef CAFFE2_SGD_LEARNING_RATE_OP_H_
#define CAFFE2_SGD_LEARNING_RATE_OP_H_
#include <cfloat>
#include <cmath>
#include "caffe2/core/context.h"
#include "caffe2/core/operator.h"
#include "caffe2/sgd/learning_rate_functors.h"
namespace caffe2 {
template <typename T, class Context>
class LearningRateOp final : public Operator<Context> {
public:
LearningRateOp(const OperatorDef& operator_def, Workspace* ws)
: Operator<Context>(operator_def, ws),
functor_(nullptr),
base_lr_(this->template GetSingleArgument<float>("base_lr", FLT_MAX)) {
CAFFE_ENFORCE_NE(base_lr_, FLT_MAX, "Base learning rate must be set.");
const string policy =
this->template GetSingleArgument<string>("policy", "");
CAFFE_ENFORCE(policy.size(), "Must specify a learning rate policy.");
functor_.reset(createLearningRateFunctor(policy));
}
USE_OPERATOR_CONTEXT_FUNCTIONS;
bool RunOnDevice() override {
int64_t iter =
OperatorBase::Input<Tensor>(0, CPU).template data<int64_t>()[0];
T learning_rate = base_lr_ * (*functor_)(iter);
// Write to output.
auto* output = Output(0);
output->Resize(vector<int64_t>());
context_.template CopyFromCPU<T>(
1, &learning_rate, Output(0)->template mutable_data<T>());
return true;
}
private:
unique_ptr<LearningRateFunctor<T>> functor_;
T base_lr_;
LearningRateFunctor<T>* createLearningRateFunctor(
const string& policy,
const string& arg_prefix = "") {
if (policy == "fixed") {
return new FixedLearningRate<T>();
} else if (policy == "alter") {
bool active_first = this->template GetSingleArgument<bool>(
arg_prefix + "active_first", true);
int64_t active_period = this->template GetSingleArgument<int64_t>(
arg_prefix + "active_period", -1);
int64_t inactive_period = this->template GetSingleArgument<int64_t>(
arg_prefix + "inactive_period", -1);
DCHECK_GE(active_period, 0);
DCHECK_GE(inactive_period, 0);
return new AlternateLearningRate<T>(
active_period, inactive_period, active_first);
} else if (policy == "hill") {
int64_t num_iter =
this->template GetSingleArgument<int>(arg_prefix + "num_iter", 0);
DCHECK_GT(num_iter, 0);
T start_multiplier = this->template GetSingleArgument<float>(
arg_prefix + "start_multiplier", 0.);
DCHECK_GE(start_multiplier, 0); // start_multiplier in range [0, 1]
DCHECK_LE(start_multiplier, 1);
T gamma =
this->template GetSingleArgument<float>(arg_prefix + "gamma", 0);
DCHECK_GT(gamma, 0);
T power =
this->template GetSingleArgument<float>(arg_prefix + "power", 0);
DCHECK_GT(power, 0);
T end_multiplier = this->template GetSingleArgument<float>(
arg_prefix + "end_multiplier", 0);
DCHECK_GE(end_multiplier, 0); // end_multiplier in range [0, 1]
DCHECK_LE(end_multiplier, 1);
return new HillLearningRate<T>(
num_iter, start_multiplier, gamma, power, end_multiplier);
} else if (policy == "step") {
int stepsize =
this->template GetSingleArgument<int>(arg_prefix + "stepsize", 0);
T gamma =
this->template GetSingleArgument<float>(arg_prefix + "gamma", 0);
DCHECK_GT(stepsize, 0);
DCHECK_GT(gamma, 0);
return new StepLearningRate<T>(stepsize, gamma);
} else if (policy == "exp") {
T gamma =
this->template GetSingleArgument<float>(arg_prefix + "gamma", 0);
DCHECK_GT(gamma, 0);
return new ExpLearningRate<T>(gamma);
} else if (policy == "gate") {
T multiplier_1 = this->template GetSingleArgument<float>(
arg_prefix + "multiplier_1", 1);
T multiplier_2 = this->template GetSingleArgument<float>(
arg_prefix + "multiplier_2", 1);
int num_iter =
this->template GetSingleArgument<int>(arg_prefix + "num_iter", 0);
// no constraint on the range of multiplier_1 and multiplier_2
return new GateLearningRate<T>(multiplier_1, multiplier_2, num_iter);
} else if (policy == "inv") {
T gamma =
this->template GetSingleArgument<float>(arg_prefix + "gamma", 0);
T power =
this->template GetSingleArgument<float>(arg_prefix + "power", 0);
DCHECK_GT(gamma, 0);
DCHECK_GT(power, 0);
return new InvLearningRate<T>(gamma, power);
} else if (policy == "poly") {
int max_iter =
this->template GetSingleArgument<int>(arg_prefix + "max_iter", -1);
T power =
this->template GetSingleArgument<float>(arg_prefix + "power", 0);
DCHECK_GT(power, 0);
return new PolyLearningRate<T>(power, max_iter);
} else if (policy == "linearWarmup") {
T start_multiplier = this->template GetSingleArgument<float>(
arg_prefix + "start_multiplier", 0.);
int num_iter =
this->template GetSingleArgument<int>(arg_prefix + "num_iter", 0);
DCHECK_GE(start_multiplier, 0);
return new LinearWarmupLearningRate<T>(start_multiplier, num_iter);
} else if (policy == "constantWarmup") {
T multiplier = this->template GetSingleArgument<float>(
arg_prefix + "multiplier", 0.5);
int num_iter =
this->template GetSingleArgument<int>(arg_prefix + "num_iter", 0);
DCHECK_GT(multiplier, 0);
return new ConstantWarmupLearningRate<T>(multiplier, num_iter);
} else if (policy == "pieceWarmup") {
T m1 = this->template GetSingleArgument<float>(arg_prefix + "m1", 0.5);
int64_t n1 =
this->template GetSingleArgument<int64_t>(arg_prefix + "n1", 0);
T m2 = this->template GetSingleArgument<float>(arg_prefix + "m2", 0.5);
int64_t n2 =
this->template GetSingleArgument<int64_t>(arg_prefix + "n2", 0);
T m3 = this->template GetSingleArgument<float>(arg_prefix + "m3", 0.5);
return new PieceWarmupLearningRate<T>(m1, n1, m2, n2, m3);
} else if (policy == "composite") {
std::vector<int> sub_policy_num_iters =
this->template GetRepeatedArgument<int>("sub_policy_num_iters");
std::list<CompositeLearningRateItem<T>> sub_policies;
CAFFE_ENFORCE_GT(
sub_policy_num_iters.size(),
0,
"Must specify at least one sub learning rate policy.");
for (size_t i = 0; i < sub_policy_num_iters.size(); ++i) {
CAFFE_ENFORCE_GT(
sub_policy_num_iters[i],
0,
"The number of iterations for sub learning rate policy should be positive.");
std::stringstream sub_policy_arg_prefix;
sub_policy_arg_prefix << "sub_policy_" << i << "_";
const string sub_policy_arg_prefix_str = sub_policy_arg_prefix.str();
const string sub_policy = this->template GetSingleArgument<string>(
sub_policy_arg_prefix_str + "policy", "");
if (sub_policy == "composite") {
CAFFE_THROW(
"Defining composite LR policy as a subpolicy of composite LR "
"policy is not allowed.");
}
const float scale_lr = this->template GetSingleArgument<float>(
sub_policy_arg_prefix_str + "lr_scale", 1.0);
sub_policies.push_back(CompositeLearningRateItem<T>(
sub_policy_num_iters[i],
scale_lr,
createLearningRateFunctor(sub_policy, sub_policy_arg_prefix_str)));
}
return new CompositeLearningRate<T>(sub_policies);
} else if (policy == "cyclical") {
T max_lr =
this->template GetSingleArgument<float>(arg_prefix + "max_lr", 0.005);
int stepsize =
this->template GetSingleArgument<int>(arg_prefix + "stepsize", 0);
T decay =
this->template GetSingleArgument<int>(arg_prefix + "decay", 1.0);
DCHECK_GT(stepsize, 0);
DCHECK_GE(max_lr, base_lr_);
return new CyclicalLearningRate<T>(base_lr_, max_lr, stepsize, decay);
} else if (policy == "constantThenLinearWarmup") {
T start_warmup_multiplier = this->template GetSingleArgument<float>(
arg_prefix + "start_warmup_multiplier", 0.1);
int64_t constant_warmup_num_iter = this->template GetSingleArgument<int>(
arg_prefix + "constant_warmup_num_iter", 10000000);
int64_t linear_warmup_num_iter = this->template GetSingleArgument<int>(
arg_prefix + "linear_warmup_num_iter", 10000000);
return new ConstantThenLinearWarmupLearningRate<T>(
start_warmup_multiplier,
constant_warmup_num_iter,
linear_warmup_num_iter);
} else if (policy == "compositeCyclical") {
T start_warmup_multiplier = this->template GetSingleArgument<float>(
arg_prefix + "start_warmup_multiplier", 0.1);
int64_t constant_warmup_num_iter = this->template GetSingleArgument<int>(
arg_prefix + "constant_warmup_num_iter", 10000000);
int64_t linear_warmup_num_iter = this->template GetSingleArgument<int>(
arg_prefix + "linear_warmup_num_iter", 10000000);
T cyclical_max_lr = this->template GetSingleArgument<float>(
arg_prefix + "cyclical_max_lr", 0.05);
int cyclical_step_size = this->template GetSingleArgument<int>(
arg_prefix + "cyclical_step_size", 1000000);
T cyclical_decay = this->template GetSingleArgument<float>(
arg_prefix + "cyclical_decay", 1.0);
DCHECK_GE(cyclical_max_lr, base_lr_);
return new CompositeCyclicalLearningRate<T>(
base_lr_,
start_warmup_multiplier,
constant_warmup_num_iter,
linear_warmup_num_iter,
cyclical_max_lr,
cyclical_step_size,
cyclical_decay);
} else if (policy == "cosine") {
T max_lr =
this->template GetSingleArgument<float>(arg_prefix + "max_lr", 0.5);
T min_lr =
this->template GetSingleArgument<float>(arg_prefix + "min_lr", 0.1);
int64_t period =
this->template GetSingleArgument<int>(arg_prefix + "period", 50);
T t_mult =
this->template GetSingleArgument<float>(arg_prefix + "t_mult", 1.0);
T lr_shrink = this->template GetSingleArgument<float>(
arg_prefix + "lr_shrink", 0.99);
DCHECK_GE(max_lr, min_lr);
return new CosineLearningRate<T>(
min_lr, max_lr, period, t_mult, lr_shrink);
} else if (policy == "compositeCosine") {
T start_warmup_multiplier = this->template GetSingleArgument<float>(
arg_prefix + "start_warmup_multiplier", 0.1);
int64_t constant_warmup_num_iter = this->template GetSingleArgument<int>(
arg_prefix + "constant_warmup_num_iter", 10000000);
int64_t linear_warmup_num_iter = this->template GetSingleArgument<int>(
arg_prefix + "linear_warmup_num_iter", 10000000);
T cosine_max_lr = this->template GetSingleArgument<float>(
arg_prefix + "cosine_max_lr", 0.5);
T cosine_min_lr = this->template GetSingleArgument<float>(
arg_prefix + "cosine_min_lr", 0.1);
int64_t cosine_period = this->template GetSingleArgument<int>(
arg_prefix + "cosine_period", 50);
T cosine_t_mult = this->template GetSingleArgument<float>(
arg_prefix + "cosine_t_mult", 1.0);
T cosine_lr_shrink = this->template GetSingleArgument<float>(
arg_prefix + "cosine_lr_shrink", 0.99);
DCHECK_GE(cosine_max_lr, cosine_min_lr);
return new CompositeCosineLearningRate<T>(
start_warmup_multiplier,
constant_warmup_num_iter,
linear_warmup_num_iter,
cosine_min_lr,
cosine_max_lr,
cosine_period,
cosine_t_mult,
cosine_lr_shrink);
} else {
CAFFE_THROW("Unknown learning rate policy: ", policy);
return NULL;
}
}
};
} // namespace caffe2
#endif // CAFFE2_SGD_LEARNING_RATE_OP_H_