Tutorial to use caffe as a library(C++, Ubuntu)

[Qingkai Lu]

I am trying to use caffe in my own c++ project under Ubuntu. Does anyone know a tutorial about how use caffe as a library in your own c++ project? I didn't see such a tutorial on the caffe website. Thank you in advance for any help!

[Felix Abecassis]

Did you see this example?
https://github.com/BVLC/caffe/tree/master/examples/cpp_classification

[Qingkai Lu]

The classification.bin  is within the caffe  library. I want to use the caffe as an extern library for my own c++ project. 

[Felix Abecassis]

It's easy to extract the classification code, you just need the headers and libcaffe.so

[Felix Abecassis]

You might be interested in this demo that I just published:
https://github.com/NVIDIA/gpu-rest-engine

This should be similar to what you are trying to do.

[Qingkai Lu]

Tried to add the headers and libcaffe.so, but it doesn't work. 

Get these errors:

/tmp/ccBU4IJg.o: In function `caffe::Caffe::set_mode(caffe::Caffe::Brew)':

extract_features.cpp:(.text._ZN5caffe5Caffe8set_modeENS0_4BrewE[_ZN5caffe5Caffe8set_modeENS0_4BrewE]+0xc): undefined reference to `caffe::Caffe::Get()'

/tmp/ccBU4IJg.o: In function `caffe::Datum::clear_data()':

extract_features.cpp:(.text._ZN5caffe5Datum10clear_dataEv[_ZN5caffe5Datum10clear_dataEv]+0x17): undefined reference to `google::protobuf::internal::kEmptyString'

/tmp/ccBU4IJg.o: In function `int feature_extraction_pipeline<float>(int, char**)':

extract_features.cpp:(.text._Z27feature_extraction_pipelineIfEiiPPc[_Z27feature_extraction_pipelineIfEiiPPc]+0x3a): undefined reference to `google::InitGoogleLogging(char const*)'

extract_features.cpp:(.text._Z27feature_extraction_pipelineIfEiiPPc[_Z27feature_extraction_pipelineIfEiiPPc]+0x6d): undefined reference to `google::LogMessage::LogMessage(char const*, int, int)'

extract_features.cpp:(.text._Z27feature_extraction_pipelineIfEiiPPc[_Z27feature_extraction_pipelineIfEiiPPc]+0x7c): undefined reference to `google::LogMessage::stream()'

extract_features.cpp:(.text._Z27feature_extraction_pipelineIfEiiPPc[_Z27feature_extraction_pipelineIfEiiPPc]+0x9a): undefined reference to `google::LogMessage::~LogMessage()'

extract_features.cpp:(.text._Z27feature_extraction_pipelineIfEiiPPc[_Z27feature_extraction_pipelineIfEiiPPc]+0x11e): undefined reference to `google::LogMessage::LogMessage(char const*, int, int)'

extract_features.cpp:(.text._Z27feature_extraction_pipelineIfEiiPPc[_Z27feature_extraction_pipelineIfEiiPPc]+0x12d): undefined reference to `google::LogMessage::stream()'

extract_features.cpp:(.text._Z27feature_extraction_pipelineIfEiiPPc[_Z27feature_extraction_pipelineIfEiiPPc]+0x14b): undefined reference to `google::LogMessage::~LogMessage()'

extract_features.cpp:(.text._Z27feature_extraction_pipelineIfEiiPPc[_Z27feature_extraction_pipelineIfEiiPPc]+0x211): undefined reference to `google::LogMessageFatal::LogMessageFatal(char const*, int, google::CheckOpString const&)'

extract_features.cpp:(.text._Z27feature_extraction_pipelineIfEiiPPc[_Z27feature_extraction_pipelineIfEiiPPc]+0x220): undefined reference to `google::LogMessage::stream()'

extract_features.cpp:(.text._Z27feature_extraction_pipelineIfEiiPPc[_Z27feature_extraction_pipelineIfEiiPPc]+0x22f): undefined reference to `google::LogMessageFatal::~LogMessageFatal()'

extract_features.cpp:(.text._Z27feature_extraction_pipelineIfEiiPPc[_Z27feature_extraction_pipelineIfEiiPPc]+0x24f): undefined reference to `google::LogMessage::LogMessage(char const*, int, int)'

extract_features.cpp:(.text._Z27feature_extraction_pipelineIfEiiPPc[_Z27feature_extraction_pipelineIfEiiPPc]+0x25e): undefined reference to `google::LogMessage::stream()'

extract_features.cpp:(.text._Z27feature_extraction_pipelineIfEiiPPc[_Z27feature_extraction_pipelineIfEiiPPc]+0x28c): undefined reference to `google::LogMessage::~LogMessage()'

extract_features.cpp:(.text._Z27feature_extraction_pipelineIfEiiPPc[_Z27feature_extraction_pipelineIfEiiPPc]+0x299): undefined reference to `caffe::Caffe::SetDevice(int)'

extract_features.cpp:(.text._Z27feature_extraction_pipelineIfEiiPPc[_Z27feature_extraction_pipelineIfEiiPPc]+0x2c5): undefined reference to `google::LogMessage::LogMessage(char const*, int, int)'

extract_features.cpp:(.text._Z27feature_extraction_pipelineIfEiiPPc[_Z27feature_extraction_pipelineIfEiiPPc]+0x2d4): undefined reference to `google::LogMessage::stream()'

extract_features.cpp:(.text._Z27feature_extraction_pipelineIfEiiPPc[_Z27feature_extraction_pipelineIfEiiPPc]+0x2f2): undefined reference to `google::LogMessage::~LogMessage()'

extract_features.cpp:(.text._Z27feature_extraction_pipelineIfEiiPPc[_Z27feature_extraction_pipelineIfEiiPPc]+0x3e5): undefined reference to `caffe::Net<float>::Net(std::string const&, caffe::Phase, caffe::Net<float> const*)'

Any hint? Thank you. 

[Qingkai Lu]

Thank you. I will have a look of this demo.

[Jan C Peters]

You need to add the google protobuf library too (-lprotobuf).

Jan

[Jan C Peters]

Oh, my bad, this is not the protobuf library, but the logging framework glog that needs to be added.

Jan