A toolkit for making real world machine learning and data analysis applications in C++


dlib C++ library Travis Status

Dlib is a modern C++ toolkit containing machine learning algorithms and tools for creating complex software in C++ to solve real world problems. See http://dlib.net for the main project documentation and API reference.

Compiling dlib C++ example programs

Go into the examples folder and type:

mkdir build; cd build; cmake .. ; cmake --build .

That will build all the examples. If you have a CPU that supports AVX instructions then turn them on like this:

mkdir build; cd build; cmake .. -DUSE_AVX_INSTRUCTIONS=1; cmake --build .

Doing so will make some things run faster.

Finally, Visual Studio users should usually do everything in 64bit mode. By default Visual Studio is 32bit, both in its outputs and its own execution, so you have to explicitly tell it to use 64bits. Since it's not the 1990s anymore you probably want to use 64bits. Do that with a cmake invocation like this:

cmake .. -G "Visual Studio 14 2015 Win64" -T host=x64 

Compiling your own C++ programs that use dlib

The examples folder has a CMake tutorial that tells you what to do. There are also additional instructions on the dlib web site.

Alternatively, if you are using the vcpkg dependency manager you can download and install dlib with CMake integration in a single command:

vcpkg install dlib

Compiling dlib Python API

Before you can run the Python example programs you must compile dlib. Type:

python setup.py install

Running the unit test suite

Type the following to compile and run the dlib unit test suite:

cd dlib/test
mkdir build
cd build
cmake ..
cmake --build . --config Release
./dtest --runall

Note that on windows your compiler might put the test executable in a subfolder called Release. If that's the case then you have to go to that folder before running the test.

This library is licensed under the Boost Software License, which can be found in dlib/LICENSE.txt. The long and short of the license is that you can use dlib however you like, even in closed source commercial software.

dlib sponsors

This research is based in part upon work supported by the Office of the Director of National Intelligence (ODNI), Intelligence Advanced Research Projects Activity (IARPA) under contract number 2014-14071600010. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of ODNI, IARPA, or the U.S. Government.

  • YOLO loss

    YOLO loss

    Hi, I've been spending the last few days trying to make a loss_yolo layer for dlib, in particular the loss presented in the YOLOv3 paper.

    I think I came up with a pretty straightforward implementation but, as of now, it still does not work.

    I wondered if you could have a look. I am quite confident the loss implementation is correct, however I think I might be making some assumptions about the dlib API when the loss layer takes several inputs from the network.

    I tried to make the loss similar to the loss_mmod in the way you set the options of the layer, etc.

    So, my question is, does this way of coding the loss in dlib make sense for multiple outputs? Or is dlib doing something I don't expect?

    There's also a simple example program that takes a path containing a training.xml file (like the one from the face or vehicle detection examples).

    Thanks in advance :)

    opened by arrufat 105
  • QUESTION : is yolov3 possible in DLIB

    QUESTION : is yolov3 possible in DLIB

    I am trying to define yolov3 using dlib's dnn module. I'm stuck with the darknet53 backbone, as I want it to output the outputs of the last three layers. So far i have this:

    using namespace dlib;
    template <int outc, int kern, int stride, typename SUBNET> 
    using conv_block = leaky_relu<affine<con<outc,kern,kern,stride,stride,SUBNET>>>;
    template <int inc, typename SUBNET>
    using resblock = add_prev1<conv_block<inc,3,1,conv_block<inc/2,1,1,tag1<SUBNET>>>>;
    template<int nblocks, int outc, typename SUBNET>
    using conv_resblock = repeat<nblocks, resblock<outc,
                          conv_block<outc, 3, 2, SUBNET>>>;
    template<typename SUBNET>
    using darknet53 = tag3<conv_resblock<4, 1024,
                      tag2<conv_resblock<8, 512,
                      tag1<conv_resblock<8, 256,
                      conv_resblock<2, 128,
                      conv_resblock<1, 64,
                      conv_block<32, 3, SUBNET

    Is it possible for darknet53 to output tag1, tag2 and tag3?

    opened by pfeatherstone 83
  • Optimize dlib for POWER8 VSX

    Optimize dlib for POWER8 VSX

    Enable and optimize support for POWER8 VSX SIMD instructions on PPC64LE Linux to dlib/simd.

    $$$$ Financial bounties available. Any reasonable suggested value will be seriously considered.

    I welcome contact / replies from developers in the dlib community who are interested to work on this project.

    opened by edelsohn 79
  • Example of DCGAN

    Example of DCGAN

    Hi, I would like to contribute a DCGAN example to dlib.

    I have implemented a version of Pytorch DCGAN for C++.

    However, I would need some guidance with some things I don't know how to do. I am wondering on how I should proceed. Should I attach my current code here (around 150 lines), or make a pull request, even if the code is not able to learn anything? Maybe @edubois can help out, since he stated that he managed to make it work on https://github.com/davisking/dlib/issues/1261

    Thanks for your hard work on dlib.

    opened by arrufat 67
  • Arbitrary sized FFTs using modified kissFFT as default backend and MKL otherwise

    Arbitrary sized FFTs using modified kissFFT as default backend and MKL otherwise

    This PR adds a C++ port of kissFFT as the default backend of dlib's fft routines. All the kiss code is inserted into the dlib namespace to avoid conflicts with user code that may or may not be using original (C) kissFFT. All MKL fft code is put into it's own separate header file. Now dlib/matrix_fft.h simply calls the right wrappers depending on a pre-processor macro (as before). I've removed the FFTW wrapper code as per @davisking's request as the fftw planner isn't thread safe. I've also removed the original fft backend code, again, as per @davisking's request.

    Note that this PR isn't quite ready yet. Need more unit tests. Not quite sure why MKL wrappers only worked for matrix<complex<double>> before. There's no reason why it couldn't work for matrix<complex<float>> if using DFTI_SINGLE instead of DFTI_DOUBLE. (maybe user code had to do a cast?) So need more units tests for MKL wrappers.

    Not quite happy with the number of copies at the moment. When passing const matrix_exp<EXP>& data as input, there are 2 copies: one to evaluate the matrix expression to matrix<typename EXP::type> and one to do either the in-place fft (copy is done in the implementation details of the fft functions) or out-of-place fft (copy is done explicitly in dlib/matrix_fft.h). For example, if you want to do the fft of std::vector<std::complex>, you have to use dlib::mat which returns a matrix expression then dlib::fft will evaluate that to dlib::matrix<std::complex<float>>. So there is a copy of std::vector to dlib::matrix that is unnecessary. Could add some function overloads to support std::vector. Don't know what's the best thing to do without dirtying the API. Could benefit from @davisking's advice.

    I think if we've gone this far, we should support real FFTs so the requirement that input should be complex vanishes. Output will be complex though. Both KISS and MKL support this so there shouldn't be a lot of leg work. More unit tests.

    opened by pfeatherstone 56
  • Add dnn self supervised learning example

    Add dnn self supervised learning example

    Hi, recently I've been interested in self-supervised learning (SSL) methods in deep learning. I noticed that dlib has support for unsupervised loss layers by just leaving out the training_label_type typedef and the truth iterator argument to compute_loss_value_and_gradient().

    However, most methods I've read about and tried are quite complicated (hard-negative mining, predictors, stop gradient, exponential moving average of the weights between both architectures) due to the need of breaking the symmetry between both branches to avoid collapse. But recently, I came across a simple method named Barlow Twins: Self-Supervised Learning via Redundancy Reduction. The idea is as follows:

    1. forward two augmented versions of an image
    2. compute the empirical cross-correlation matrix between both feature representations
    3. make that matrix as close to the identity as possible.

    That prevents collapse, since it's making each individual dimension of the feature vectors to focus on different tasks, and thus avoiding redundancies between dimensions (it needs a high dimension for it to work, since it relies on sparse representations).

    So far, I've implemented:


    It takes a std::vector<std::pair<matrix<rgb_pixel>, matrix<rgb_pixel>>> and puts the first elements of the pairs in the first half of the batch and the second elements of the batch in the second half of the batch. This allows computing batch normalization on each half efficiently (done on the loss layer).


    I tried to follow the official paper as close as possible, and made use of the awesome Matrix Calculus site for the gradients (having element wise operations, (off-)diagonal terms, and summations was a bit tedious to do manually 😅)

    But… I am experiencing some difficulties:

    • if I use a dnn_trainer I get a segfault (but if I train manually, like in the code, it works: at least the loss goes down)
    • if I use a batch size larger than 64, I also get a segfault (but I have plenty of RAM/VRAM)

    So maybe I misunderstood something about how to implement the input layer or the unsupervised loss layer… If you could have a look at some point… You can just run the example by giving a path to a folder containing the CIFAR-10 dataset.

    It would be great to have an example of SSL on dlib.

    Thanks in advance (all the code is inside the example program, I will make a proper PR if we manage to get this work, and you are interested, since the method is fairly new)

    opened by arrufat 54
  • Add support for fused convolutions

    Add support for fused convolutions

    I've been playing a bit with the idea of having fused convolutions (convolution + batch_norm) in dlib. I think the first step would be to move all the operations that are done by the affine_ layer into the convolution, that is, update the bias of the convolution and re-scale the filters.

    This PR adds some helper methods that allow doing this. The next step could be adding a new layer that can be constructed from an affine_ layer and it's a no-op, like the tag layers, or add a version of the affine layer that does nothing (just outputs its input, without copying or anything). How would you approach this?

    Finally, here's an example that uses a visitor to update the convolutions that are below an affine layer. It can be build from by putting the file into the examples folder and loading the pretrained resnet 50 from the dnn_introduction3_ex.cpp. If we manage to make something interesting out of it, maybe it would be interesting to have this visitor, too.

    #include "resnet.h"
    #include <dlib/dnn.h>
    #include <dlib/image_io.h>
    using namespace std;
    using namespace dlib;
    class visitor_fuse_convolutions
        template <typename T> void fuse_convolutions(T&) const
            // disable other layer types
        // handle the standard case (convolutional layer followed by affine;
        template <long nf, long nr, long nc, int sy, int sx, int py, int px, typename U, typename E>
        void fuse_convolutions(add_layer<affine_, add_layer<con_<nf, nr, nc, sy, sx, py, px>, U>, E>& l)
            // get the parameters from the affine layer as alias_tensor_instance
            auto gamma = l.layer_details().get_gamma();
            auto beta = l.layer_details().get_beta();
            // get the convolution below the affine layer and its paramaters
            auto& conv = l.subnet().layer_details();
            const long num_filters_out = conv.num_filters();
            const long num_rows = conv.nr();
            const long num_cols = conv.nc();
            tensor& params = conv.get_layer_params();
            // guess the number of input filters
            long num_filters_in;
            if (conv.bias_is_disabled())
                num_filters_in = params.size() / num_filters_out / num_rows / num_cols;
                num_filters_in = (params.size() - num_filters_out) / num_filters_out / num_rows / num_cols;
            // set the new number of parameters for this convolution
            const size_t num_params = num_filters_in * num_filters_out * num_rows * num_cols + num_filters_out;
            alias_tensor filters(num_filters_out, num_filters_in, num_rows, num_cols);
            alias_tensor biases(1, num_filters_out);
            if (conv.bias_is_disabled())
                resizable_tensor new_params = params;
                biases(new_params, filters.size()) = 0;
                params = new_params;
            // update the biases
            auto b = biases(params, filters.size());
            b+= mat(beta);
            // rescale the filters
            DLIB_CASSERT(filters.num_samples() == gamma.k());
            auto t = filters(params, 0);
            float* f = t.host();
            const float* g = gamma.host();
            for (long n = 0; n < filters.num_samples(); ++n)
                for (long k = 0; k < filters.k(); ++k)
                    for (long r = 0; r < filters.nr(); ++r)
                        for (long c = 0; c < filters.nc(); ++c)
                            f[tensor_index(t, n, k, r, c)] *= g[n];
            // reset the affine layer
            gamma = 1;
            beta = 0;
        template <typename input_layer_type>
        void operator()(size_t , input_layer_type& l) const
            // ignore other layers
        template <typename T, typename U, typename E>
        void operator()(size_t , add_layer<T, U, E>& l)
    int main(const int argc, const char** argv)
        resnet::infer_50 net1, net2;
        std::vector<std::string> labels;
        deserialize("resnet50_1000_imagenet_classifier.dnn") >> net1 >> labels;
        net2 = net1;
        matrix<rgb_pixel> image;
        load_image(image, "elephant.jpg");
        const auto& label1 = labels[net1(image)];
        const auto& out1 = net1.subnet().get_output();
        resizable_tensor probs(out1);
        tt::softmax(probs, out1);
        cout << "pred1: " << label1 << " (" << max(mat(probs)) << ")" << endl;
        // fuse the convolutions in the network
        dlib::visit_layers_backwards(net2, visitor_fuse_convolutions());
        const auto& label2 = labels[net2(image)];
        const auto& out2 = net2.subnet().get_output();
        tt::softmax(probs, out2);
        cout << "pred2: " << label2 << " (" << max(mat(probs)) << ")" << endl;
        cout << "max abs difference: " << max(abs(mat(out1) - mat(out2))) << endl;
        DLIB_CASSERT(max(abs(mat(out1) - mat(out2))) < 1e-2);
    catch (const exception& e)
        cout << e.what() << endl;
        return EXIT_FAILURE;

    output with this image (elephant.jpg): elephant

    pred1: African_elephant (0.962677)
    pred2: African_elephant (0.962623)
    max abs difference: 0.00436211

    UPDATE: make visitor more generic and show a results with a real image

    opened by arrufat 53
  • Semantic Segmentation Functionality

    Semantic Segmentation Functionality

    I'm interested in using dlib for semantic segmentation. I think the only necessary features would be:

    • Loss function - it doesn't look like loss_multiclass_log would work for this
    • "Unpooling" upsampling layer - there are a few ways to do this

    Is this something you're interested in supporting? I'm planning to add this functionality regardless, just wanted to check in.

    Regarding implementation, would the upsampling be something you would want added to the pooling class or its own upsample class?

    enhancement help wanted 
    opened by davidmascharka 53
  • Adding an install target to dlib's CMakeLists

    Adding an install target to dlib's CMakeLists

    This PR covers the first part of items discussed in #34, namely, the installation.

    A follow-up PR (hopefully tomorrow) should cover the 2nd part, namely, the generation and installation of dlibConfig.cmake

    opened by severin-lemaignan 51
  • Trying to compile dlib 19.20 with cuda 11 and cudnn 8, or cuda 10.1 and cudnn 7.6.4

    Trying to compile dlib 19.20 with cuda 11 and cudnn 8, or cuda 10.1 and cudnn 7.6.4

    Environment: Pop-Os (Ubuntu 20.04) Gcc 9 and 8 (tried both) Cmake 3.16.3 dlib 19.20.99 python 3.8.2 NVIDIA Quadro P600

    Expected Behavior

    Compiling with cuda..

    Current Behavior

    ..... -- Found cuDNN: /usr/lib/x86_64-linux-gnu/libcudnn.so -- Building a CUDA test project to see if your compiler is compatible with CUDA... -- Checking if you have the right version of cuDNN installed. -- *** Found cuDNN, but it looks like the wrong version so dlib will not use it. *** -- *** Dlib requires cuDNN V5.0 OR GREATER. Since cuDNN is not found DLIB WILL NOT USE CUDA. .....

    • Where did you get dlib: git clone https://github.com/davisking/dlib.git

    I first tried downloading the latest (and suggested) version of cuda from Nvidia site, which was Cuda 11. then downloaded cuDNN for Cuda 11, which was 8.0.0 (runtime and dev .deb packets) installed them following Nvidia method.

    when compiling "cudnn_samples_v8" everything works, so I think installations went ok. but no way to get dlib compiled with Cuda.

    I've tried to uninstall cuda 11 and cudnn 8 and install cuda 10.1 and cudnn 7.6 (suggested for cuda 10.1) but the result is the same. Every time I erased the build directory, and compiled in 2 ways: as per dlib instructions, using: $ sudo python3 setup.py install or: $ cmake .. -DDLIB_USE_CUDA=1 -DUSE_AVX_INSTRUCTIONS=1

    Any suggestion? Thanks.

    opened by spiderdab 48
  • Arbitrary FFT sizes

    Arbitrary FFT sizes

    Feature suggestion: allow the fft routine to do arbitrary sized FFTs. Let FFTW, lapack, BLAS or whatever do the magic of choosing the correct kernels for the input

    opened by pfeatherstone 47
  • Dlib implementation

    Dlib implementation

    how can I implement dlib with an existing project? all I need is compute_face_descriptor function. I have to use it on android to get the floating points encoding.

    opened by Eliastoomme 0
  • Isolation Forest as possibility?

    Isolation Forest as possibility?

    Hello - i'm wondering if there might already be most of the ingredients in dlib to implement an isolation forest?

    I see random_forest_regression_trainer so am guessing maybe would be building blocks from that that could maybe be used.

    Background here is that we (Netdata) are currently using kmeans for some unsupervised anomaly detection and i am debating if we try move next (to support broader feature repesentastions that can take account of things like time of day and other features more easily) to something like one class svm or maybe even see about contributing some variant of isolation forest potentially.

    Ultimatly i want us to use autoencoders but unclear or unsure if we'd ever be able to do that efficiently enough in our monitoring agent, so was thinking isolation forest or one class svm could be next slighlty more advanced model to try.

    opened by andrewm4894 2
  • Installing dlib returns an error that no matter what I do, I can't seem to fix.

    Installing dlib returns an error that no matter what I do, I can't seem to fix.

    Expected Behavior

    I wasn't using dlib to begin with, I just had to install it so I can use a library called face_recognizer. Well, no matter what I do, dlib would just not install and return TONS of errors. What should happen is for dlib to install, but it isnt.

    Current Behavior

    Whatever the hell I do to install dlib, I get this exact same error: https://mystb.in/AtlanticGhostEffective (error too long)

    Steps to Reproduce

    I'm using python 3.11. I tried doing the normal pip install dlib I tried building cmake then doing the git cloning dlib and using make to build it, I tried using python to do setup.py install, I tried EVERYTHING.

    • Version: latest

    • Where did you get dlib: official source

    • Platform: No LSB modules are available. Distributor ID: Zorin Description: Zorin OS 16.2 Release: 16 Codename: focal

    • Compiler: I guess cmake? I'm not sure, I just followed tons of guides including this: https://gist.github.com/ageitgey/629d75c1baac34dfa5ca2a1928a7aeaf and this: https://pyimagesearch.com/2018/01/22/install-dlib-easy-complete-guide/

    opened by Sxvxgee 3
  • dlib install error

    dlib install error

    Discussed in https://github.com/davisking/dlib/discussions/2677

    Originally posted by HossamAbdelraof October 29, 2022 iam trying to install dlib in win10 using python pip and each time this error pop

          -- Building for: Visual Studio 17 2022
          -- Selecting Windows SDK version  to target Windows 10.0.19044.
          -- The C compiler identification is unknown
          -- The CXX compiler identification is unknown
          CMake Error at CMakeLists.txt:14 (project):
            No CMAKE_C_COMPILER could be found.
          CMake Error at CMakeLists.txt:14 (project):
            No CMAKE_CXX_COMPILER could be found.

    tried to clone and build using cmake

    git clone https://github.com/davisking/dlib.git cd dlib mkdir build; cd build; cmake ..; cmake --build . 
    #until here it worked fine but when run this 
    cd .. 
    python3 setup.py install

    it return the same error

    i have vs 17 2022, re downloaded it many times and nothing happen any one can help ?

    opened by HossamAbdelraof 0
  • error: undefined reference to `cblas_dger'

    error: undefined reference to `cblas_dger'


    It is OK to suggest interesting improvements to dlib, even if you are not volunteering to implement them. However, the issue tracker is not a code writing service, do not ask for someone to write code for you. E.g. Do not ask for feature improvements to the example programs. If there is some feature improvement you want in an example program then it's up to you to write it.

    Before you ask a question, check Google for a solution, the dlib FAQ, or consult the dlib documentation. Every single function in dlib is documented in detail. If you obviously haven't read the documentation your issue will be closed.

    If you aren't reporting a bug or problem with dlib then delete this template and write whatever you want here.

    Expected Behavior


    Current Behavior

    Steps to Reproduce

    • Version: 19.24
    • Where did you get dlib: http://dlib.net/
    • Platform: ubuntu18.04
    • Compiler:
    opened by JufeiFan 0
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