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This repository was forked from https://bitbucket.org/amitibo/cyipopt and is now considered the primary repository. The fork includes a SciPy-style interface, ability to handle exceptions in the callback functions, and docker container for easy usage.

README for cyipopt

Ipopt (Interior Point OPTimizer, pronounced eye-pea-opt) is a software package for large-scale nonlinear optimization. Ipopt is available from the COIN-OR initiative, under the Eclipse Public License (EPL).

cyipopt is a Python wrapper around Ipopt. It enables using Ipopt from the comfort of the Python programming language.

Status

Anaconda
PyPi https://pepy.tech/badge/ipopt
Travis CI https://api.travis-ci.org/matthias-k/cyipopt.svg?branch=master
Appveyor https://ci.appveyor.com/api/projects/status/0o5yuogn3jx157ee?svg=true

Usage

For simple cases where you do not need the full power of sparse and structured Jacobians etc, cyipopt provides the function minimize_ipopt which has the same behaviour as scipy.optimize.minimize, for example:

from scipy.optimize import rosen, rosen_der
from ipopt import minimize_ipopt
x0 = [1.3, 0.7, 0.8, 1.9, 1.2]
res = minimize_ipopt(rosen, x0, jac=rosen_der)
print(res)

Installation

Using conda

The Anaconda Python Distribution is one of the easiest ways to install Python and associated pre-complied packages for Linux, Mac, and Windows. Once Anaconda (or miniconda) is installed, you can install cyipopt on Linux and Mac from the Conda Forge channel with:

conda install -c conda-forge cyipopt

The above command will install binary versions of all the necessary dependencies and cyipopt. Note that there currently are no Windows binaries. You will have to install from source from Windows or if you want a customized installation, e.g. with MKL, HSL, etc.

From source

To begin installing from source you will need to install the following dependencies:

  • C/C++ compiler
  • pkg-config [only for Linux and Mac]
  • Ipopt [>3.13.0 for Windows]
  • Python 2.7 or 3.6+
  • setuptools
  • cython
  • numpy
  • six
  • future
  • scipy [optional]

The binaries and header files of the Ipopt package can be obtained from http://www.coin-or.org/download/binary/Ipopt/. These include a version compiled against the MKL library. Or you can build Ipopt from source. The remaining dependencies can be installed with conda or other package managers.

On Linux and Mac

Download the source files of cyipopt and update setup.py to point to the header files and binaries of the Ipopt package, if LD_LIBRARY_PATH and pkg_config are not setup to find ipopt on their own.

Then, execute:

python setup.py install
From source on Windows

Install the dependencies with conda (Anaconda or Miniconda):

conda.exe install -c conda-forge numpy cython future six setuptools

Or alternatively with pip:

pip install numpy cython future six setuptools

Additionally, make sure you have a C compiler setup to compile Python C extensions, e.g. Visual C++. Build tools for VS2019 https://visualstudio.microsoft.com/downloads/#build-tools-for-visual-studio-2019 have been tested to work for conda Python 3.7 (see https://github.com/matthias-k/cyipopt/issues/52).

Download and extract the cyipopt source code from Github or PyPi.

Download the latest precompiled version of Ipopt that includes the DLL files from https://github.com/coin-or/Ipopt/releases. Note that the current setup only supports Ipopt >= 3.13.0. The build 3.13.2 of Ipopt has been confirmed to work and can be downloaded from Ipopt-3.13.2-win64-msvs2019-md.zip . After Ipopt is extracted, the bin, lib and include folders should be in the root cyipopt directory, i.e. adjacent to the setup.py file. Alternatively, you can set the environment variable IPOPTWINDIR to point to the Ipopt directory that contains the bin, lib and include directories.

Finally, execute:

python setup.py install

NOTE: It is advised to use the Anaconda or Miniconda distributions and not the official python.org distribution. Even though it has been tested to work with the latest builds, it is well-known for causing issues. (see https://github.com/matthias-k/cyipopt/issues/52).

Example Installation on Ubuntu 18.04 Using Dependencies Installed Via APT

All of the dependencies can be installed with Ubuntu's package manager:

sudo apt install build-essential pkg-config python-dev python-six cython python-numpy coinor-libipopt1v5 coinor-libipopt-dev

The NumPy and IPOPT libs and headers are installed in standard locations, so you should not need to set LD_LIBRARY_PATH or PKG_CONFIG_PATH.

Now run python setup.py build to compile cyipopt. In the output of this command you should see two calls to gcc for compiling and linking. Make sure both of these are pointing to the correct libraries and headers. They will look something like this (formatted and commented for easy viewing here):

$ python setup.py build
...
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing
  -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/build/python2.7-3hk45v/python2.7-2.7.15~rc1=.
  -fstack-protector-strong -Wformat -Werror=format-security -fPIC
  -I/usr/local/include/coin  # points to IPOPT headers
  -I/usr/local/include/coin/ThirdParty  # points to IPOPT third party headers
  -I/usr/lib/python2.7/dist-packages/numpy/core/include  # points to NumPy headers
  -I/usr/include/python2.7  # points to Python 2.7 headers
  -c src/cyipopt.c -o build/temp.linux-x86_64-2.7/src/cyipopt.o
x86_64-linux-gnu-gcc -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions -Wl,-Bsymbolic-functions -Wl,-z,relro
  -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -Wdate-time -D_FORTIFY_SOURCE=2 -g
  -fdebug-prefix-map=/build/python2.7-3hk45v/python2.7-2.7.15~rc1=. -fstack-protector-strong -Wformat
  -Werror=format-security -Wl,-Bsymbolic-functions -Wl,-z,relro -Wdate-time -D_FORTIFY_SOURCE=2 -g
  -fdebug-prefix-map=/build/python2.7-3hk45v/python2.7-2.7.15~rc1=. -fstack-protector-strong -Wformat
  -Werror=format-security build/temp.linux-x86_64-2.7/src/cyipopt.o
  -L/usr/local/lib
  -L/lib/../lib
  -L/usr/lib/../lib
  -L/usr/lib/gcc/x86_64-linux-gnu/5
  -L/usr/lib/gcc/x86_64-linux-gnu/5/../../..
  -L/usr/lib/gcc/x86_64-linux-gnu/5/../../../../lib
  -L/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu
  -lipopt -llapack -lblas -lm -ldl -lcoinmumps -lblas -lgfortran -lm -lquadmath  # linking to relevant libs
  -lcoinhsl -llapack -lblas -lgfortran -lm -lquadmath -lcoinmetis  # linking to relevant libs
  -o build/lib.linux-x86_64-2.7/cyipopt.so
...

You can check that everything linked correctly with ldd:

$ ldd build/lib.linux-x86_64-2.7/cyipopt.so
linux-vdso.so.1 (0x00007ffc1677c000)
libipopt.so.0 => /usr/local/lib/libipopt.so.0 (0x00007fcdc8668000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fcdc8277000)
libcoinmumps.so.0 => /usr/local/lib/libcoinmumps.so.0 (0x00007fcdc7eef000)
libcoinhsl.so.0 => /usr/local/lib/libcoinhsl.so.0 (0x00007fcdc7bb4000)
liblapack.so.3 => /usr/lib/x86_64-linux-gnu/liblapack.so.3 (0x00007fcdc732e000)
libblas.so.3 => /usr/lib/x86_64-linux-gnu/libblas.so.3 (0x00007fcdc70d3000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fcdc6ecf000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fcdc6b46000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fcdc67a8000)
/lib64/ld-linux-x86-64.so.2 (0x00007fcdc8d20000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fcdc6590000)
libcoinmetis.so.0 => /usr/local/lib/libcoinmetis.so.0 (0x00007fcdc6340000)
libgfortran.so.3 => /usr/lib/x86_64-linux-gnu/libgfortran.so.3 (0x00007fcdc600f000)
libopenblas.so.0 => /usr/lib/x86_64-linux-gnu/libopenblas.so.0 (0x00007fcdc3d69000)
libgfortran.so.4 => /usr/lib/x86_64-linux-gnu/libgfortran.so.4 (0x00007fcdc398a000)
libquadmath.so.0 => /usr/lib/x86_64-linux-gnu/libquadmath.so.0 (0x00007fcdc374a000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fcdc352b000)

And finally install the package into Python's default package directory:

$ python setup.py install

Note that you may or may not want to install this package system wide, i.e. prepend sudo to the above command, but it is safest to install into your user space, i.e. what pip install --user does, or setup a virtual environment with tools like venv or conda. If you use virtual environments you will need to be careful about selecting headers and libraries for packages in or out of the virtual environments in the build step. Note that six, cython, and numpy could alternatively be installed using Python specific package managers, e.g. pip install six cython numpy.

Example Installation on Ubuntu 18.04 With Custom Compiled IPOPT

Install system wide dependencies:

$ sudo apt install pkg-config python-dev wget
$ sudo apt build-dep coinor-libipopt1v5

Install pip so all Python packages can be installed via pip:

$ sudo apt install python-pip

Then use pip to install the following packages:

$ pip install --user numpy cython six future
Compile Ipopt

The Ipopt compilation instructions are derived from https://www.coin-or.org/Ipopt/documentation/node14.html. If you get errors, start there for help.

Download Ipopt source code. Choose the version that you would like to have from <https://www.coin-or.org/download/source/Ipopt/>. For example:

$ cd ~
$ wget https://www.coin-or.org/download/source/Ipopt/Ipopt-3.12.11.tgz

Extract the Ipopt source code:

$ tar -xvf Ipopt-3.12.11.tgz

Create a temporary environment variable pointing to the Ipopt directory:

export IPOPTDIR=~/Ipopt-3.12.11

To use linear solvers other than the default mumps, e.g. ma27, ma57, ma86 solvers, the HSL package are needed. HSL can be downloaded from its official website <http://www.hsl.rl.ac.uk/ipopt/>.

Extract HSL source code after you get it. Rename the extracted folder to coinhsl and copy it in the HSL folder: Ipopt-3.12.11/ThirdParty/HSL

Build Ipopt:

$ mkdir $IPOPTDIR/build
$ cd $IPOPTDIR/build
$ ../configure
$ make
$ make test

Add make install if you want a system wide install.

Set environment variables:

$ export IPOPT_PATH="~/Ipopt-3.12.11/build"
$ export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:$IPOPT_PATH/lib/pkgconfig
$ export PATH=$PATH:$IPOPT_PATH/bin

Get help from this web-page if you get errors in setting environments:

https://stackoverflow.com/questions/13428910/how-to-set-the-environmental-variable-ld-library-path-in-linux

Now compile cyipopt. Download the cyipopt source code from PyPi, for example:

$ cd ~
$ wget https://files.pythonhosted.org/packages/05/57/a7c5a86a8f899c5c109f30b8cdb278b64c43bd2ea04172cbfed721a98fac/ipopt-0.1.9.tar.gz
$ tar -xvf ipopt-0.1.8.tar.gz
$ cd ipopt

Compile cyipopt:

$ python setup.py build

If there is no error, then you have compiled cyipopt successfully

Check that everything linked correctly with ldd

$ ldd build/lib.linux-x86_64-2.7/cyipopt.so
linux-vdso.so.1 (0x00007ffe895e1000)
libipopt.so.1 => /home/<username>/Ipopt-3.12.11/build/lib/libipopt.so.1 (0x00007f74efc2a000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f74ef839000)
libcoinmumps.so.1 => /home/<username>/Ipopt-3.12.11/build/lib/libcoinmumps.so.1 (0x00007f74ef4ae000)
libcoinhsl.so.1 => /home/<username>/Ipopt-3.12.11/build/lib/libcoinhsl.so.1 (0x00007f74ef169000)
liblapack.so.3 => /usr/lib/x86_64-linux-gnu/liblapack.so.3 (0x00007f74ee8cb000)
libblas.so.3 => /usr/lib/x86_64-linux-gnu/libblas.so.3 (0x00007f74ee65e000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f74ee45a000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f74ee0d1000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f74edd33000)
/lib64/ld-linux-x86-64.so.2 (0x00007f74f02c0000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f74edb1b000)
libcoinmetis.so.1 => /home/<username>/Ipopt-3.12.11/build/lib/libcoinmetis.so.1 (0x00007f74ed8ca000)
libgfortran.so.4 => /usr/lib/x86_64-linux-gnu/libgfortran.so.4 (0x00007f74ed4eb000)

Install cyipopt (prepend sudo if you want a system wide install):

$ python setup.py install

To use cyipopt you will need to set the LD_LIBRARY_PATH to point to your Ipopt install if you did not install it to a standard location. For example:

$ export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:~/Ipopt-3.12.11/build/lib

You can add this to your shell's configuration file if you want it set every time you open your shell, for example the following line can it can be added to your ~/.bashrc

$ echo 'export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$HOME/Ipopt-3.12.11/build/lib' >> ~/.bashrc

Now you should be able to run a cyipopt example:

$ cd test
$ python -c "import ipopt"
$ python examplehs071.py

If it could be run successfully, the optimization will start with the following descriptions:

******************************************************************************
This program contains Ipopt, a library for large-scale nonlinear optimization.
 Ipopt is released as open source code under the Eclipse Public License (EPL).
         For more information visit http://projects.coin-or.org/Ipopt
******************************************************************************

This is Ipopt version 3.12.11, running with linear solver ma27.
...

Docker container

The subdirectory docker contains a docker container with preinstalled ipopt and cyipopt. To build the container, cd into the docker directory and run make. Then you can start the container by:

$ docker run -it matthiask/ipopt /bin/bash

and either call ipopt directly or start a ipython shell and import ipopt.

Vagrant environment

The subdirectory vagrant contains a Vagrantfile that installs ipopt and cyipopt in OS provision. To build the environment, cd into the vagrant directory and run vagrant up (Requires that you have Vagrant+VirtualBox installed). Then you can access the system by:

$ vagrant ssh

and either call ipopt directly or start a python shell and import ipopt. Also, if you get source files <http://www.coin-or.org/download/binary/Ipopt/> of coinhsl and put it in the vagrant directory, the vagrant provision will detect and add them in the ipopt compiling process, and then you will have ma57, ma27, and other solvers available on ipopt binary (ma97 and mc68 were removed to avoid compilation errors).

Reading the docs

After installing:

$ cd doc
$ make html

Then, direct your browser to build/html/index.html.

Testing

You can test the installation by running the examples under the folder test\.

Conditions of use

cyipopt is open-source code released under the EPL license.

Contributing

For bug reports use the github issue tracker. You can also send wishes, comments, patches, etc. to matthias.kuemmerer@bethgelab.org

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