dlib Documentation

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

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Technical Documentation: davisking/dlib

ℹ️ Provenance: Multi-Tier Ingestion · CodeWiki Reference

Overview (`README.md`)

dlib C++ library [](https://github.com/davisking/dlib/actions/workflows/build_cpp.yml) [](https://github.com/davisking/dlib/actions/workflows/build_python.yml)

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

You need a C++17 compiler and CMake. Go into the examples folder and type:

bash
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:

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

Doing so will make some things run faster.

Visual Studio users can explicitly select a 64bit target and compiler with a CMake invocation like this:

bash
cmake .. -G "Visual Studio 17 2022" -A x64 -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:

bash
vcpkg install dlib

Compiling dlib Python API

Either fetch the latest stable release of dlib from PyPi and install that:

bash
pip install dlib

Or fetch the very latest version from github and install that:

bash
git clone https://github.com/davisking/dlib.git
cd dlib
pip install .

It's possible to change build settings by passing parameters to setup.py or DLIB_* environment variables.
For example, setting the environment variable DLIB_NO_GUI_SUPPORT to ON will add the cmake option
-DDLIB_NO_GUI_SUPPORT=ON.

Running the unit test suite

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

bash
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.

README (`docs/README.txt`)

This "package" is just a copy of the stuff I use to generate the documentation
for the dlib library. It contains a copy of the XSLT and XML I use to
generate the HTML documentation.

The current version of these files can be obtained from the dlib GitHub
repository at: https://github.com/davisking/dlib

======================== Overview ========================

I write all my documentation in XML files. If you look through the files in
the docs folder you will see each of them. There is also a stylesheet.xsl
file which contains all the XSLT I wrote to transform XML files into HTML.
Anyway, I use that stylesheet to generate the dlib documentation from those
XML files.

There is also a stylesheet inside the docs/chm folder (htmlhelp_stylesheet.xsl)
that knows how to look at the XML files and generate the table of contents
files needed by the htmlhelp tool (the thing that makes chm help files).

Also note that the first 80 or so lines of the stylesheet.xsl file contains
stuff specific to the dlib project and thus should be changed or removed
as appropriate if you want to reuse it for a different project.

======================== Installing the required tools ========================

To begin with, the XML and XSLT is usable on any operating system, however,
all the scripts I have in the docs folder that automate everything are bash
shell scripts. I also use stuff like wine and other Linux tools and I have
only ever tested any of this in Debian. So if you want to use all the scripts
then you should probably run this stuff in Linux. But if not you can probably
hack something together :)

There are four scripts in the docs folder.

  • testenv_rel: This script tests your environment for all the needed utilities.
    Run it and it should tell you what else you need to install.
    Note that the htmlify utility is something I wrote and is in
    dlib's repository in the tools/htmlify folder. You should
    build and install it. (go into that folder, make a subfolder
    called build, then cd into build and say: "cmake ..; make;
    sudo make install". You will need to install cmake if you
    don't have it already)

  • makedocs: This remakes all the HTML documentation by pulling files out
    of the dlib repository. If you want to use this stuff for your
    own projects you will need to edit this file a bit.

    Note that this script puts its output in the docs/web and
    docs/chm/docs folders. I use the chm folder for off-line
    documentation while the web folder contains what goes onto
    dlib.net. Both sets of HTML are generated from the same XML
    files and are mostly the same. You will see and
    tags inside the XML though in cases where the two
    differ.

  • makerel: Runs makedocs as well as creates tar and zip files of the project.
    It also runs htmlhelp in wine to generate the chm help files.
    Note that you will need to run docs/chm/htmlhelp/setup_htmlhelp.sh
    before it will work in wine.

======================== License for documentation files ========================

To the extent possible under law, Davis E King has waived all copyright and
related or neighboring rights to dlib documentation (XML, HTML, and XSLT files).
This work is published from United States.

That is, I (Davis the author) don't care what you do with this. So do
whatever you want :)

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file size packed size bpb corruption

a: 1 9 72 no
aaa: 100000 3771 0.30168 no
alphabet: 100000 486 0.03888 no
random: 100000 112509 9.00072 no

average: 20.3353

time: 78ms

text
The Large Corpus

file size packed size bpb corruption

E.coli: 4638690 4747257 8.18724 no
bible: 4047392 2466675 4.87558 no
word: 2473400 1301805 4.21058 no

average: 5.7578

time: 3.25sec

Docs Chm README (`docs/docs/chm/README.txt`)

The Table of Contents.hhc file is auto generated by the toc.xml and htmlhelp_stylesheet.xsl files.
You really can edit it if you want but I suggest you use the stylesheet to auto generate it instead.

If you want to regenerate the table of contents file you can do so with
the command "msxsl toc.xml htmlhelp_stylesheet.xsl" if you are using msxsl.exe.

Docs Python Index (`docs/docs/python/index.rst`)

.. image:: ../dlib-logo.png
:alt: Dlib C++ Library
:target: http://dlib.net

Dlib is principally a C++ library, however, you can use a number of its tools
from python applications. This page documents the python API for working with
these dlib tools. If you haven't done so already, you should probably look at
the python example programs first before consulting this reference. These
example programs are little mini-tutorials for using dlib from python. They
are listed on the left of the main dlib web page.

Classes

.. include:: classes.txt

Functions

.. include:: functions.txt

Constants

.. include:: constants.txt

Detailed API Listing

.. toctree::
:maxdepth: 2

.. automodule:: _dlib_pybind11
:members:
:undoc-members:

.. automodule:: _dlib_pybind11.cuda
:members:
:undoc-members:

.. automodule:: _dlib_pybind11.image_dataset_metadata
:members:
:undoc-members:

--- METRICS ---

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