Warning
This package has been superseded by the leidenalg package and will no longer be maintained.
louvain-igraph
This package implements the louvain algorithm in C++ and exposes it to
python. It relies on (python-)igraph for it to function. Besides the
relative flexibility of the implementation, it also scales well, and can be run
on graphs of millions of nodes (as long as they can fit in memory). The core
function is find_partition which finds the optimal partition using the
louvain algorithm [1] for a number of different methods. The methods currently
implemented are (1) modularity [2], (2) Reichardt and Bornholdt's model using
the configuration null model and the Erdรถs-Rรฉnyi null model [3], (3) the
constant Potts model (CPM) [4], (4) Significance [5], and finally (5)
Surprise [6]. In addition, it supports multiplex partition optimisation
allowing community detection on for example negative links [7] or multiple
time slices [8]. It also provides some support for community detection on
bipartite graphs. See the documentation for more information.
Installation
In short: pip install louvain. All major platforms are supported on
Python>=3.5, earlier versions of Python are no longer supported. Alternatively,
you can install from Anaconda (channels conda-forge).
For Unix like systems it is possible to install from source. For Windows this is
overly complicated, and you are recommended to use the binary wheels. The igraph
C core library is provided within this package, and is automatically
compiled. If you encounter any issue with compilation, please see
http://igraph.org.
Make sure you have all necessary tools for compilation. In Ubuntu this can be
installed using sudo apt-get install build-essential autoconf automake flex
bison, please refer to the documentation for your specific system. Make sure
that not only gcc is installed, but also g++, as the louvain-igraph
package is programmed in C++.
You can check if all went well by running a variety of tests using python
setup.py test.
There are basically two installation modes, similar to the python-igraph package itself (from which most of the setup.py comes).
- No
Ccore library is installed yet. TheCcore library of igraph that is provided within thelouvain-igraphpackage is compiled. - A
Ccore library is already installed. In this case, you may link dynamically to the already installed version by specifying--no-pkg-config. This is probably also the version that is used by the igraph package, but you may want to double check this.
In case the python-igraph package is already installed before, make sure that
both use the same versions (at least the same minor version, which should be
API compatible).
Troubleshooting
In case of any problems, best to start over with a clean environment. Make sure
you remove the python-igraph package completely, remove the C core
library and remove the louvain-igraph package. Then, do a complete reinstall
starting from pip install louvain-igraph. In case you want a dynamic library be
sure to then install the C core library from source before. Make sure you
install the same versions.
Usage
There is no standalone version of louvain-igraph, and you will always need
python to access it. There are no plans for developing a standalone version or
R support. So, use python. Please refer to the documentation for more details
on function calls and parameters.
Just to get you started, below the essential parts. To start, make sure to import the packages:
>>> import louvain
>>> import igraph as igWe'll create a random graph for testing purposes:
>>> G = ig.Graph.Erdos_Renyi(100, 0.1);For simply finding a partition use:
>>> part = louvain.find_partition(G, louvain.ModularityVertexPartition);Contribute
Source code: https://github.com/vtraag/louvain-igraph
Issue tracking: https://github.com/vtraag/louvain-igraph/issues
See the documentation on Implementation for more details on how to contribute new methods.
References
Please cite the references appropriately in case they are used.
| [1] | Blondel, V. D., Guillaume, J.-L., Lambiotte, R., & Lefebvre, E. (2008). Fast unfolding of communities in large networks. Journal of Statistical Mechanics: Theory and Experiment, 10008(10), 6. 10.1088/1742-5468/2008/10/P10008 |
| [2] | Newman, M. E. J., & Girvan, M. (2004). Finding and evaluating community structure in networks. Physical Review E, 69(2), 026113. 10.1103/PhysRevE.69.026113 |
| [3] | Reichardt, J., & Bornholdt, S. (2006). Statistical mechanics of community detection. Physical Review E, 74(1), 016110. 10.1103/PhysRevE.74.016110 |
| [4] | Traag, V. A., Van Dooren, P., & Nesterov, Y. (2011). Narrow scope for resolution-limit-free community detection. Physical Review E, 84(1), 016114. 10.1103/PhysRevE.84.016114 |
| [5] | Traag, V. A., Krings, G., & Van Dooren, P. (2013). Significant scales in community structure. Scientific Reports, 3, 2930. 10.1038/srep02930 |
| [6] | Traag, V. A., Aldecoa, R., & Delvenne, J.-C. (2015). Detecting communities using asymptotical surprise. Physical Review E, 92(2), 022816. 10.1103/PhysRevE.92.022816 |
| [7] | Traag, V. A., & Bruggeman, J. (2009). Community detection in networks with positive and negative links. Physical Review E, 80(3), 036115. 10.1103/PhysRevE.80.036115 |
| [8] | Mucha, P. J., Richardson, T., Macon, K., Porter, M. A., & Onnela, J.-P. (2010). Community structure in time-dependent, multiscale, and multiplex networks. Science, 328(5980), 876โ8. 10.1126/science.1184819 |
Licence
Copyright (C) 2020 V.A. Traag
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.