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Kodiak, a C++ Library for Rigorous Branch and Bound Computation

Kodiak is a C++ library that implements a generic branch and bound algorithm for rigorous numerical approximations. Particular instances of the branch and bound algorithm allow the user to refine and isolate solutions to systems of nonlinear equations and inequalities, global optimization problems, and bifurcation sets for systems of ODEs. Kodiak utilizes interval arithmetic (via the filib++ library) and Bernstein enclosure (for polynomials and rational functions) as self-validating enclosure methods. Symbolic operations support procedures such as automatic partial differentiation.

Maintainers

Marco A. Feliu (marco.feliu@nianet.org), National Institute of Aerospace

Aaron M. Dutle (aaron.m.dutle@nasa.gov), NASA Langley Research Center, US.

Previous Contributors

Cesar A. Munoz, formerly at NASA Langley Research Center, US.

Andrew P. Smith, formerly at National Institute of Aerospace, US.

Anthony Narkawicz, formerly at NASA Langley Research Center, US.

Mantas Markevicius, formerly at University of York, UK.

Documentation

Currently, the main documentation is contained in this file. Publications concerning the library and associated algorithms are in preparation. There are also numerous comments in the source code.

Support and Contribution

See the instructions in this file and the linked resources. For further assistance, or to report problems and bugs, please contact the authors. Contributions to the library are welcomed.

Obtaining Kodiak

The repository is located at: https://github.com/nasa/Kodiak/

License

The Kodiak C++ Library is released under NASA's Open Source Agreement. See the files LICENSES/Kodiak-NOSA.pdf and LICENSES/Kodiak-BooleanChecker-NOSA.pdf; see also the copyright notice at the end of this file.

Installation and Usage Options

Kodiak is installed from source code. Kodiak is run by encoding a problem in a C++ program file, then compiling and running it.

2. Prerequisites

It is recommended to run Kodiak on a Linux or Mac computer with the GNU C++ compiler; so far it has been successfully tested on Ubuntu Linux and Mac OS X. Use of Windows is not supported, although it ought to be feasible, and the authors would welcome any report of successfully running the software on Windows or any other system.

The following software should firstly be installed, if not already present (please follow the links for instructions and support):

  • C++ compiler (standard >=C++14 required)

  • CMake build tool (version >=3.12 required)

  • filib++ interval library (version 3.0.2 required) configured with the following options:

    $ ./configure CFLAGS=-fPIC CPPFLAGS=-fPIC CXXFLAGS=-fPIC
    

    before invoking the make commands:

    $ make
    $ make install
    
  • Boost libraries (only for debugging): http://www.boost.org/users/download/ In addition to the headers, you need at least the library serialization.

2. Build Library and Examples

If necessary, unzip the zip file in order to extract the files. The following files and directories should be present:

  • In the working directory: this README.md file and a CMakeListst.txt file
  • LICENSES: licenses and copyrights for Kodiak
  • logo: Kodiak's logo and credits
  • src: source code for the library
  • examples: example C++ files (.cpp) containing several problems

If any of the prerequisite libraries were installed in non-standard directories, then the file CMakeLists.txt should be modified accordingly.

Create a build directory to keep the compiled libraries and make it the current working directory:

$ mkdir build
$ cd build

Now, run CMake for creating the build scripts:

$ cmake ..

If this command fails because CMake cannot find FILIB, add the FILIB_ROOT environment variable with the path to the FILIB source code directory used during the installation.

$ FILIB_ROOT=<FILIB-directory> cmake ..

Finally, build all targets by invoking the CMake build command:

$ cmake --build .

Using the Library

The Kodiak library is used in your own C/C++ programs. A good way to start is to take one of the existing .cpp files in the examples directory and adapt it to your purposes. You can either invoke the compiler directly with a link to the filib++ and Kodiak libraries, or else add a new entry to the examples/CMakeLists.txt file. For C programs, please use the src/Adapters/Codiak.h header file to invoke Kodiak's routines.

Be aware that care must be taken with the order in which commands are invoked. All variables should be declared before any variable resolutions are set.

Version

Kodiak ver. 2.0.3, January 2022

Logo

The Kodiak logo was designed by Mahyar Malekpour (NASA).

License and Copyright Notice

The code in this repository is released under NASA's Open Source Agreement. See the directory LICENSES.

Notices:

Copyright 2017 United States Government as represented by the
   Administrator of the National Aeronautics and Space Administration.
   All Rights Reserved.

Disclaimers:

No Warranty: THE SUBJECT SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY
WARRANTY OF ANY KIND, EITHER EXPRESSED, IMPLIED, OR STATUTORY,
INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY THAT THE SUBJECT SOFTWARE
WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR FREEDOM FROM
INFRINGEMENT, ANY WARRANTY THAT THE SUBJECT SOFTWARE WILL BE ERROR
FREE, OR ANY WARRANTY THAT DOCUMENTATION, IF PROVIDED, WILL CONFORM TO
THE SUBJECT SOFTWARE.  THIS AGREEMENT DOES NOT, IN ANY MANNER,
CONSTITUTE AN ENDORSEMENT BY GOVERNMENT AGENCY OR ANY PRIOR RECIPIENT
OF ANY RESULTS, RESULTING DESIGNS, HARDWARE, SOFTWARE PRODUCTS OR ANY
OTHER APPLICATIONS RESULTING FROM USE OF THE SUBJECT SOFTWARE.
FURTHER, GOVERNMENT AGENCY DISCLAIMS ALL WARRANTIES AND LIABILITIES
REGARDING THIRD-PARTY SOFTWARE, IF PRESENT IN THE ORIGINAL SOFTWARE,
AND DISTRIBUTES IT "AS IS."

Waiver and Indemnity: RECIPIENT AGREES TO WAIVE ANY AND ALL CLAIMS
AGAINST THE UNITED STATES GOVERNMENT, ITS CONTRACTORS AND
SUBCONTRACTORS, AS WELL AS ANY PRIOR RECIPIENT.  IF RECIPIENT'S USE OF
THE SUBJECT SOFTWARE RESULTS IN ANY LIABILITIES, DEMANDS, DAMAGES,
EXPENSES OR LOSSES ARISING FROM SUCH USE, INCLUDING ANY DAMAGES FROM
PRODUCTS BASED ON, OR RESULTING FROM, RECIPIENT'S USE OF THE SUBJECT
SOFTWARE, RECIPIENT SHALL INDEMNIFY AND HOLD HARMLESS THE UNITED
STATES GOVERNMENT, ITS CONTRACTORS AND SUBCONTRACTORS, AS WELL AS ANY
PRIOR RECIPIENT, TO THE EXTENT PERMITTED BY LAW.  RECIPIENT'S SOLE
REMEDY FOR ANY SUCH MATTER SHALL BE THE IMMEDIATE, UNILATERAL
TERMINATION OF THIS AGREEMENT.

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Library for rigorous verification of non-linear arithmetic

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