caffe源码学习之Proto数据格式【１】
前言：
由于业务需要，接触caffe已经有接近半年，一直忙着阅读各种论文，重现大大小小的模型. 期间也总结过一些caffe源码学习笔记，断断续续，这次打算系统的记录一下caffe源码学习笔记，巩固一下C++，同时也梳理一下自己之前的理解。
正文：
我们先不看caffe的框架结构，先介绍一下caffe.proto，是google开源的一种数据交互格式－－Ｇoogle Protobuf,这种数据的格式,我们可以看到caffe.proto中内容：
syntax = "proto2";
package caffe; //caffe.prto中的各个结构封装在caffe包中，可以通过using namespace caffe; 或者caffe::** 调用
// Specifies the shape (dimensions) of a Blob.
message BlobShape {
repeated int64 dim = 1 [packed = true];
}
message BlobProto {
optional BlobShape shape = 7;
repeated float data = 5 [packed = true];
repeated float diff = 6 [packed = true];
repeated double double_data = 8 [packed = true];
repeated double double_diff = 9 [packed = true];
// 4D dimensions -- deprecated. Use "shape" instead.
optional int32 num = 1 [default = 0];
optional int32 channels = 2 [default = 0];
optional int32 height = 3 [default = 0];
optional int32 width = 4 [default = 0];
}
.......当我们在编译完成caffe之后，会自动在src/caffe/proto中生成两个文件caffe.pb.h 和caffe.pb.cc
那么这种数据格式在程序中是如何被使用的呢？ 我们举一个简单的例子,来演示caffe.proto生成caffe.pb.h和caffe.pb.cc以及被调用的过程
如果你之前能够编译caffe成功，则说明你已经成功安装了Protobuf,那么我简单的编写一个使用Protobuf的例子吧.
我们先编写一个文件caffe.proto:
package caffe;
message student
{
required int32 age = 1; //ID required 表示必要字段
required string name = 2; //str 必要字段
optional int32 grade = 3 ; //optional field 可选字段，可以有无，最多ｂ
}然后我们执行如下操作。
protoc -I=. --cpp_out=. ./caffe.protoprotobuf会自动生成.cc和.h文件
1 // Generated by the protocol buffer compiler. DO NOT EDIT!
2 // source: caffe.proto
3
4 #ifndef PROTOBUF_caffe_2eproto__INCLUDED
5 #define PROTOBUF_caffe_2eproto__INCLUDED
6
7 #include <string>
8
9 #include <google/protobuf/stubs/common.h>
10
11 #if GOOGLE_PROTOBUF_VERSION < 2005000
12 #error This file was generated by a newer version of protoc which is
13 #error incompatible with your Protocol Buffer headers. Please update
14 #error your headers.
15 #endif
16 #if 2005000 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
17 #error This file was generated by an older version of protoc which is
18 #error incompatible with your Protocol Buffer headers. Please
19 #error regenerate this file with a newer version of protoc.
20 #endif
21
22 #include <google/protobuf/generated_message_util.h>
23 #include <google/protobuf/message.h>
24 #include <google/protobuf/repeated_field.h>
25 #include <google/protobuf/extension_set.h>
26 #include <google/protobuf/unknown_field_set.h>
27 // @@protoc_insertion_point(includes)
28
29 namespace caffe {
30
31 // Internal implementation detail -- do not call these.
32 void protobuf_AddDesc_caffe_2eproto();
33 void protobuf_AssignDesc_caffe_2eproto();
34 void protobuf_ShutdownFile_caffe_2eproto();
35
36 class student;
37
38 // ===================================================================
39
40 class student : public ::google::protobuf::Message {
41 public:
42 student();
43 virtual ~student();
44
45 student(const student& from);
46
47 inline student& operator=(const student& from) {
48 CopyFrom(from);
49 return *this;
50 }
51
52 inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
53 return _unknown_fields_;
54 }
55
56 inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
57 return &_unknown_fields_;
58 }
59
60 static const ::google::protobuf::Descriptor* descriptor();
61 static const student& default_instance();
62
63 void Swap(student* other);
64
65 // implements Message ----------------------------------------------
66
67 student* New() const;
68 void CopyFrom(const ::google::protobuf::Message& from);
69 void MergeFrom(const ::google::protobuf::Message& from);
70 void CopyFrom(const student& from);
71 void MergeFrom(const student& from);
72 void Clear();
73 bool IsInitialized() const;
74
75 int ByteSize() const;
76 bool MergePartialFromCodedStream(
77 ::google::protobuf::io::CodedInputStream* input);
78 void SerializeWithCachedSizes(
79 ::google::protobuf::io::CodedOutputStream* output) const;
80 ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output) const;
81 int GetCachedSize() const { return _cached_size_; }
82 private:
83 void SharedCtor();
84 void SharedDtor();
85 void SetCachedSize(int size) const;
86 public:
87
88 ::google::protobuf::Metadata GetMetadata() const;
89
90 // nested types ----------------------------------------------------
91
92 // accessors -------------------------------------------------------
93
94 // required int32 age = 1;
95 inline bool has_age() const;
96 inline void clear_age();
97 static const int kAgeFieldNumber = 1;
98 inline ::google::protobuf::int32 age() const;
99 inline void set_age(::google::protobuf::int32 value);
100
101 // required string name = 2;
102 inline bool has_name() const;
103 inline void clear_name();
104 static const int kNameFieldNumber = 2;
105 inline const ::std::string& name() const;
106 inline void set_name(const ::std::string& value);
107 inline void set_name(const char* value);
108 inline void set_name(const char* value, size_t size);
109 inline ::std::string* mutable_name();
110 inline ::std::string* release_name();
111 inline void set_allocated_name(::std::string* name);
112
113 // optional int32 grade = 3;
114 inline bool has_grade() const;
115 inline void clear_grade();
116 static const int kGradeFieldNumber = 3;
117 inline ::google::protobuf::int32 grade() const;
118 inline void set_grade(::google::protobuf::int32 value);
119
120 // @@protoc_insertion_point(class_scope:caffe.student)
121 private:
122 inline void set_has_age();
123 inline void clear_has_age();
124 inline void set_has_name();
125 inline void clear_has_name();
126 inline void set_has_grade();
127 inline void clear_has_grade();
128
129 ::google::protobuf::UnknownFieldSet _unknown_fields_;
130
131 ::std::string* name_;
132 ::google::protobuf::int32 age_;
133 ::google::protobuf::int32 grade_;
134
135 mutable int _cached_size_;
136 ::google::protobuf::uint32 _has_bits_[(3 + 31) / 32];
137
138 friend void protobuf_AddDesc_caffe_2eproto();
139 friend void protobuf_AssignDesc_caffe_2eproto();
140 friend void protobuf_ShutdownFile_caffe_2eproto();
141
142 void InitAsDefaultInstance();
143 static student* default_instance_;
144 };
145 // ===================================================================
146
147
148 // ===================================================================
149
150 // student
151
152 // required int32 age = 1;
153 inline bool student::has_age() const {
154 return (_has_bits_[0] & 0x00000001u) != 0;
155 }
156 inline void student::set_has_age() {
157 _has_bits_[0] |= 0x00000001u;
158 }
159 inline void student::clear_has_age() {
160 _has_bits_[0] &= ~0x00000001u;
161 }
162 inline void student::clear_age() {
163 age_ = 0;
164 clear_has_age();
165 }
166 inline ::google::protobuf::int32 student::age() const {
167 return age_;
168 }
169 inline void student::set_age(::google::protobuf::int32 value) {
170 set_has_age();
171 age_ = value;
172 }
173
174 // required string name = 2;
175 inline bool student::has_name() const {
176 return (_has_bits_[0] & 0x00000002u) != 0;
177 }
178 inline void student::set_has_name() {
179 _has_bits_[0] |= 0x00000002u;
180 }
181 inline void student::clear_has_name() {
182 _has_bits_[0] &= ~0x00000002u;
183 }
184 inline void student::clear_name() {
185 if (name_ != &::google::protobuf::internal::kEmptyString) {
186 name_->clear();
187 }
188 clear_has_name();
189 }
190 inline const ::std::string& student::name() const {
191 return *name_;
192 }
193 inline void student::set_name(const ::std::string& value) {
194 set_has_name();
195 if (name_ == &::google::protobuf::internal::kEmptyString) {
196 name_ = new ::std::string;
197 }
198 name_->assign(value);
199 }
200 inline void student::set_name(const char* value) {
201 set_has_name();
202 if (name_ == &::google::protobuf::internal::kEmptyString) {
203 name_ = new ::std::string;
204 }
205 name_->assign(value);
206 }
207 inline void student::set_name(const char* value, size_t size) {
208 set_has_name();
209 if (name_ == &::google::protobuf::internal::kEmptyString) {
210 name_ = new ::std::string;
211 }
212 name_->assign(reinterpret_cast<const char*>(value), size);
213 }
214 inline ::std::string* student::mutable_name() {
215 set_has_name();
216 if (name_ == &::google::protobuf::internal::kEmptyString) {
217 name_ = new ::std::string;
218 }
219 return name_;
220 }
221 inline ::std::string* student::release_name() {
222 clear_has_name();
223 if (name_ == &::google::protobuf::internal::kEmptyString) {
224 return NULL;
225 } else {
226 ::std::string* temp = name_;
227 name_ = const_cast< ::std::string*>(&::google::protobuf::internal::kEmptyString);
228 return temp;
229 }
230 }
231 inline void student::set_allocated_name(::std::string* name) {
232 if (name_ != &::google::protobuf::internal::kEmptyString) {
233 delete name_;
234 }
235 if (name) {
236 set_has_name();
237 name_ = name;
238 } else {
239 clear_has_name();
240 name_ = const_cast< ::std::string*>(&::google::protobuf::internal::kEmptyString);
241 }
242 }
243
244 // optional int32 grade = 3;
245 inline bool student::has_grade() const {
246 return (_has_bits_[0] & 0x00000004u) != 0;
247 }
248 inline void student::set_has_grade() {
249 _has_bits_[0] |= 0x00000004u;
250 }
251 inline void student::clear_has_grade() {
252 _has_bits_[0] &= ~0x00000004u;
253 }
254 inline void student::clear_grade() {
255 grade_ = 0;
256 clear_has_grade();
257 }
258 inline ::google::protobuf::int32 student::grade() const {
259 return grade_;
260 }
261 inline void student::set_grade(::google::protobuf::int32 value) {
262 set_has_grade();
263 grade_ = value;
264 }
265
266
267 // @@protoc_insertion_point(namespace_scope)
268
269 } // namespace caffe
270
271 #ifndef SWIG
272 namespace google {
273 namespace protobuf {
274
275
276 } // namespace google
277 } // namespace protobuf
278 #endif // SWIG
279
280 // @@protoc_insertion_point(global_scope)
281
282 #endif // PROTOBUF_caffe_2eproto__INCLUDED 1 // Generated by the protocol buffer compiler. DO NOT EDIT!
2 // source: caffe.proto
3
4 #define INTERNAL_SUPPRESS_PROTOBUF_FIELD_DEPRECATION
5 #include "caffe.pb.h"
6
7 #include <algorithm>
8
9 #include <google/protobuf/stubs/common.h>
10 #include <google/protobuf/stubs/once.h>
11 #include <google/protobuf/io/coded_stream.h>
12 #include <google/protobuf/wire_format_lite_inl.h>
13 #include <google/protobuf/descriptor.h>
14 #include <google/protobuf/generated_message_reflection.h>
15 #include <google/protobuf/reflection_ops.h>
16 #include <google/protobuf/wire_format.h>
17 // @@protoc_insertion_point(includes)
18
19 namespace caffe {
20
21 namespace {
22
23 const ::google::protobuf::Descriptor* student_descriptor_ = NULL;
24 const ::google::protobuf::internal::GeneratedMessageReflection*
25 student_reflection_ = NULL;
26
27 } // namespace
28
29
30 void protobuf_AssignDesc_caffe_2eproto() {
31 protobuf_AddDesc_caffe_2eproto();
32 const ::google::protobuf::FileDescriptor* file =
33 ::google::protobuf::DescriptorPool::generated_pool()->FindFileByName(
34 "caffe.proto");
35 GOOGLE_CHECK(file != NULL);
36 student_descriptor_ = file->message_type(0);
37 static const int student_offsets_[3] = {
38 GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(student, age_),
39 GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(student, name_),
40 GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(student, grade_),
41 };
42 student_reflection_ =
43 new ::google::protobuf::internal::GeneratedMessageReflection(
44 student_descriptor_,
45 student::default_instance_,
46 student_offsets_,
47 GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(student, _has_bits_[0]),
48 GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(student, _unknown_fields_),
49 -1,
50 ::google::protobuf::DescriptorPool::generated_pool(),
51 ::google::protobuf::MessageFactory::generated_factory(),
52 sizeof(student));
53 }
54
55 namespace {
56
57 GOOGLE_PROTOBUF_DECLARE_ONCE(protobuf_AssignDescriptors_once_);
58 inline void protobuf_AssignDescriptorsOnce() {
59 ::google::protobuf::GoogleOnceInit(&protobuf_AssignDescriptors_once_,
60 &protobuf_AssignDesc_caffe_2eproto);
61 }
62
63 void protobuf_RegisterTypes(const ::std::string&) {
64 protobuf_AssignDescriptorsOnce();
65 ::google::protobuf::MessageFactory::InternalRegisterGeneratedMessage(
66 student_descriptor_, &student::default_instance());
67 }
68
69 } // namespace
70
71 void protobuf_ShutdownFile_caffe_2eproto() {
72 delete student::default_instance_;
73 delete student_reflection_;
74 }
75
76 void protobuf_AddDesc_caffe_2eproto() {
77 static bool already_here = false;
78 if (already_here) return;
79 already_here = true;
80 GOOGLE_PROTOBUF_VERIFY_VERSION;
81
82 ::google::protobuf::DescriptorPool::InternalAddGeneratedFile(
83 "\n\013caffe.proto\022\005caffe\"3\n\007student\022\013\n\003age\030\001"
84 " \002(\005\022\014\n\004name\030\002 \002(\t\022\r\n\005grade\030\003 \001(\005", 73);
85 ::google::protobuf::MessageFactory::InternalRegisterGeneratedFile(
86 "caffe.proto", &protobuf_RegisterTypes);
87 student::default_instance_ = new student();
88 student::default_instance_->InitAsDefaultInstance();
89 ::google::protobuf::internal::OnShutdown(&protobuf_ShutdownFile_caffe_2eproto);
90 }
91
92 // Force AddDescriptors() to be called at static initialization time.
93 struct StaticDescriptorInitializer_caffe_2eproto {
94 StaticDescriptorInitializer_caffe_2eproto() {
95 protobuf_AddDesc_caffe_2eproto();
96 }
97 } static_descriptor_initializer_caffe_2eproto_;
98
99 // ===================================================================
100
101 #ifndef _MSC_VER
102 const int student::kAgeFieldNumber;
103 const int student::kNameFieldNumber;
104 const int student::kGradeFieldNumber;
105 #endif // !_MSC_VER
106
107 student::student()
108 : ::google::protobuf::Message() {
109 SharedCtor();
110 }
111
112 void student::InitAsDefaultInstance() {
113 }
114
115 student::student(const student& from)
116 : ::google::protobuf::Message() {
117 SharedCtor();
118 MergeFrom(from);
119 }
120
121 void student::SharedCtor() {
122 _cached_size_ = 0;
123 age_ = 0;
124 name_ = const_cast< ::std::string*>(&::google::protobuf::internal::kEmptyString);
125 grade_ = 0;
126 ::memset(_has_bits_, 0, sizeof(_has_bits_));
127 }
128
129 student::~student() {
130 SharedDtor();
131 }
132
133 void student::SharedDtor() {
134 if (name_ != &::google::protobuf::internal::kEmptyString) {
135 delete name_;
136 }
137 if (this != default_instance_) {
138 }
139 }
140
141 void student::SetCachedSize(int size) const {
142 GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
143 _cached_size_ = size;
144 GOOGLE_SAFE_CONCURRENT_WRITES_END();
145 }
146 const ::google::protobuf::Descriptor* student::descriptor() {
147 protobuf_AssignDescriptorsOnce();
148 return student_descriptor_;
149 }
150
151 const student& student::default_instance() {
152 if (default_instance_ == NULL) protobuf_AddDesc_caffe_2eproto();
153 return *default_instance_;
154 }
155
156 student* student::default_instance_ = NULL;
157
158 student* student::New() const {
159 return new student;
160 }
161
162 void student::Clear() {
163 if (_has_bits_[0 / 32] & (0xffu << (0 % 32))) {
164 age_ = 0;
165 if (has_name()) {
166 if (name_ != &::google::protobuf::internal::kEmptyString) {
167 name_->clear();
168 }
169 }
170 grade_ = 0;
171 }
172 ::memset(_has_bits_, 0, sizeof(_has_bits_));
173 mutable_unknown_fields()->Clear();
174 }
175
176 bool student::MergePartialFromCodedStream(
177 ::google::protobuf::io::CodedInputStream* input) {
178 #define DO_(EXPRESSION) if (!(EXPRESSION)) return false
179 ::google::protobuf::uint32 tag;
180 while ((tag = input->ReadTag()) != 0) {
181 switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
182 // required int32 age = 1;
183 case 1: {
184 if (::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
185 ::google::protobuf::internal::WireFormatLite::WIRETYPE_VARINT) {
186 DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
187 ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
188 input, &age_)));
189 set_has_age();
190 } else {
191 goto handle_uninterpreted;
192 }
193 if (input->ExpectTag(18)) goto parse_name;
194 break;
195 }
196
197 // required string name = 2;
198 case 2: {
199 if (::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
200 ::google::protobuf::internal::WireFormatLite::WIRETYPE_LENGTH_DELIMITED) {
201 parse_name:
202 DO_(::google::protobuf::internal::WireFormatLite::ReadString(
203 input, this->mutable_name()));
204 ::google::protobuf::internal::WireFormat::VerifyUTF8String(
205 this->name().data(), this->name().length(),
206 ::google::protobuf::internal::WireFormat::PARSE);
207 } else {
208 goto handle_uninterpreted;
209 }
210 if (input->ExpectTag(24)) goto parse_grade;
211 break;
212 }
213
214 // optional int32 grade = 3;
215 case 3: {
216 if (::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
217 ::google::protobuf::internal::WireFormatLite::WIRETYPE_VARINT) {
218 parse_grade:
219 DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
220 ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
221 input, &grade_)));
222 set_has_grade();
223 } else {
224 goto handle_uninterpreted;
225 }
226 if (input->ExpectAtEnd()) return true;
227 break;
228 }
229
230 default: {
231 handle_uninterpreted:
232 if (::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
233 ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
234 return true;
235 }
236 DO_(::google::protobuf::internal::WireFormat::SkipField(
237 input, tag, mutable_unknown_fields()));
238 break;
239 }
240 }
241 }
242 return true;
243 #undef DO_
244 }
245
246 void student::SerializeWithCachedSizes(
247 ::google::protobuf::io::CodedOutputStream* output) const {
248 // required int32 age = 1;
249 if (has_age()) {
250 ::google::protobuf::internal::WireFormatLite::WriteInt32(1, this->age(), output);
251 }
252
253 // required string name = 2;
254 if (has_name()) {
255 ::google::protobuf::internal::WireFormat::VerifyUTF8String(
256 this->name().data(), this->name().length(),
257 ::google::protobuf::internal::WireFormat::SERIALIZE);
258 ::google::protobuf::internal::WireFormatLite::WriteString(
259 2, this->name(), output);
260 }
261
262 // optional int32 grade = 3;
263 if (has_grade()) {
264 ::google::protobuf::internal::WireFormatLite::WriteInt32(3, this->grade(), output);
265 }
266
267 if (!unknown_fields().empty()) {
268 ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
269 unknown_fields(), output);
270 }
271 }
272
273 ::google::protobuf::uint8* student::SerializeWithCachedSizesToArray(
274 ::google::protobuf::uint8* target) const {
275 // required int32 age = 1;
276 if (has_age()) {
277 target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(1, this->age(), target);
278 }
279
280 // required string name = 2;
281 if (has_name()) {
282 ::google::protobuf::internal::WireFormat::VerifyUTF8String(
283 this->name().data(), this->name().length(),
284 ::google::protobuf::internal::WireFormat::SERIALIZE);
285 target =
286 ::google::protobuf::internal::WireFormatLite::WriteStringToArray(
287 2, this->name(), target);
288 }
289
290 // optional int32 grade = 3;
291 if (has_grade()) {
292 target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(3, this->grade(), target);
293 }
294
295 if (!unknown_fields().empty()) {
296 target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
297 unknown_fields(), target);
298 }
299 return target;
300 }
301
302 int student::ByteSize() const {
303 int total_size = 0;
304
305 if (_has_bits_[0 / 32] & (0xffu << (0 % 32))) {
306 // required int32 age = 1;
307 if (has_age()) {
308 total_size += 1 +
309 ::google::protobuf::internal::WireFormatLite::Int32Size(
310 this->age());
311 }
312
313 // required string name = 2;
314 if (has_name()) {
315 total_size += 1 +
316 ::google::protobuf::internal::WireFormatLite::StringSize(
317 this->name());
318 }
319
320 // optional int32 grade = 3;
321 if (has_grade()) {
322 total_size += 1 +
323 ::google::protobuf::internal::WireFormatLite::Int32Size(
324 this->grade());
325 }
326
327 }
328 if (!unknown_fields().empty()) {
329 total_size +=
330 ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
331 unknown_fields());
332 }
333 GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
334 _cached_size_ = total_size;
335 GOOGLE_SAFE_CONCURRENT_WRITES_END();
336 return total_size;
337 }
338
339 void student::MergeFrom(const ::google::protobuf::Message& from) {
340 GOOGLE_CHECK_NE(&from, this);
341 const student* source =
342 ::google::protobuf::internal::dynamic_cast_if_available<const student*>(
343 &from);
344 if (source == NULL) {
345 ::google::protobuf::internal::ReflectionOps::Merge(from, this);
346 } else {
347 MergeFrom(*source);
348 }
349 }
350
351 void student::MergeFrom(const student& from) {
352 GOOGLE_CHECK_NE(&from, this);
353 if (from._has_bits_[0 / 32] & (0xffu << (0 % 32))) {
354 if (from.has_age()) {
355 set_age(from.age());
356 }
357 if (from.has_name()) {
358 set_name(from.name());
359 }
360 if (from.has_grade()) {
361 set_grade(from.grade());
362 }
363 }
364 mutable_unknown_fields()->MergeFrom(from.unknown_fields());
365 }
366
367 void student::CopyFrom(const ::google::protobuf::Message& from) {
368 if (&from == this) return;
369 Clear();
370 MergeFrom(from);
371 }
372
373 void student::CopyFrom(const student& from) {
374 if (&from == this) return;
375 Clear();
376 MergeFrom(from);
377 }
378
379 bool student::IsInitialized() const {
380 if ((_has_bits_[0] & 0x00000003) != 0x00000003) return false;
381
382 return true;
383 }
384
385 void student::Swap(student* other) {
386 if (other != this) {
387 std::swap(age_, other->age_);
388 std::swap(name_, other->name_);
389 std::swap(grade_, other->grade_);
390 std::swap(_has_bits_[0], other->_has_bits_[0]);
391 _unknown_fields_.Swap(&other->_unknown_fields_);
392 std::swap(_cached_size_, other->_cached_size_);
393 }
394 }
395
396 ::google::protobuf::Metadata student::GetMetadata() const {
397 protobuf_AssignDescriptorsOnce();
398 ::google::protobuf::Metadata metadata;
399 metadata.descriptor = student_descriptor_;
400 metadata.reflection = student_reflection_;
401 return metadata;
402 }
403
404
405 // @@protoc_insertion_point(namespace_scope)
406
407 } // namespace caffe
408
409 // @@protoc_insertion_point(global_scope)生成之后，我们编写一个读取文件caffeReader.cpp
#include "caffe.pb.h"
#include<iostream>
#include<ios>
using namespace std;
void InfoStudents(const caffe::student & stu){
cout<< "student info:"<<endl;
cout<<"name: "<<stu.name()<<endl;
cout<<"age: "<<stu.age()<<endl;
cout<<"grade: "<<stu.grade()<<endl;
}
int main(void)
{
caffe::student stu;
stu.set_age(18);
stu.set_name("gongxijun");
stu.set_grade(146);
InfoStudents(stu);
return 0;
}编译完成之后，我们执行如下命令：
g++ caffeRead.cpp -o caffeReader caffe.pb.cc -I /usr/local/protobuf/include -L /usr/local/protobuf/lib -lprotobuf -pthread 生成二进制执行文件caffeReader.我们运行该文件就会显示如下信息：
知道了proto文件是如何使用之，再去caffe.proto中看看caffe中定义的结构体：
message 表示需要传输的的参数的结构体.
caffe.proto中保存的有二进制大文件Blob的结构信息：BlobProto, BlobProtoVector, Datum
BlobProto：
1 // Specifies the shape (dimensions) of a Blob.
2 //用来表示图片的shape
3 message BlobShape {
4 repeated int64 dim = 1 [packed = true];
5 }
6
7 message BlobProto {
8 optional BlobShape shape = 7; //现在用来替换下面的num,channels ,height,width,推荐使用
9 repeated float data = 5 [packed = true]; //forward计算数据
10 repeated float diff = 6 [packed = true]; //backward的残差数据
11 repeated double double_data = 8 [packed = true]; //双精度forward计算数据
12 repeated double double_diff = 9 [packed = true]; //双精度backward的残差数据
13
14 // 4D dimensions -- deprecated. Use "shape" instead.
15 optional int32 num = 1 [default = 0]; // 图片个数or 维度
16 optional int32 channels = 2 [default = 0]; //通过比如rgb便是３维
17 optional int32 height = 3 [default = 0]; //图片高度
18 optional int32 width = 4 [default = 0]; //图片宽度
19 }BlobProtoVector：BlobProto的动态数组
message BlobProtoVector {
repeated BlobProto blobs = 1;
}Datum是lmdb的数据格式，详情可以看这里 http://blog.csdn.net/u010668907/article/details/51834411
message Datum {//lmdb中的数据格式
optional int32 channels = 1;//图片通道数比如rgb的通道数为3
optional int32 height = 2;//图片的高度
optional int32 width = 3;//图片的宽度
// the actual image data, in bytes
optional bytes data = 4;//图片的数据.比如rgb的三维数组格式
optional int32 label = 5;//这张图片对应的标签,或者这块图像对应的标签[比如20个分类转换成数字之后对应的[0~19]
// Optionally, the datum could also hold float data.
repeated float float_data = 6;//图片的数据,有时候图片在转换过程中会变成浮点型
// If true data contains an encoded image that need to be decoded
optional bool encoded = 7 [default = false];//是否需要解码
}剩下的大部分都是Layer部分和Net部分和Solver部分的参数，关于Blob和Layer,Net还有Solver这四个部分的关系:
blob作为贯穿整个框架的数据单元，Sovler通过sovler.prototxt【我觉得我可能需要说明一下：.proto和.prototxt的区别吧，这两个都是google protobuff的文件，.proto用来定义结构体参数，.prototxt用来相应的.proto中的结构体的初始化数据】配置初始化Net，然后Net通过调用trainval.prototxt这些参数，来调用对应的Layer，并将数据blob输入到相应的Layer中，Layer来对流入的数据进行计算处理，然后再将计算后的blob数据返回，通过Net流向下一个Layer,每次执行一次,Solver就会计数一次，然后调整learn_rate,descay_weith等权值,参考的是caffe论坛上的这个话题：这里附上链接
http://www.caffecn.cn/?/question/123&sort_key=agree_count&sort=DESC
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原始发表：2017-06-16 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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