These codes are for our paper "Local Lanczos Spectral Approximation for Community Detection"

Before compiling codes, the following software should be installed in your system.

• Matlab
• gcc (for Linux and Mac) or Microsoft Visual Studio (for Windows)

• SNAP datasets (available at http://snap.stanford.edu/data/)
• LFR benchmark graphs (available at http://sites.google.com/site/santofortunato/inthepress2/)

• Amazon dataset (available at http://snap.stanford.edu/data/com-Amazon.html)
• nodes: 334863, edges: 925872
• nodes are products, edges are co-purchase relationships
• top 5000 communities with ground truth size >= 3

$ cd LLSA_codes 
$ matlab 
$ mex -largeArrayDims GetLocalCond.c   % compile the mex file 
$ mex -largeArrayDims hkgrow_mex.cpp   % compile the mex file 
$ LLSA(k,alpha) 

k: number of Lanczos iteration (default: 4)

alpha: a parameter controls local minimal conductance (default: 1.03)

$ cd baseline_codes/LOSP
$ matlab 
$ LOSP

$ cd baseline_codes/HK
$ matlab 
$ mex -largeArrayDims hkgrow_mex.cpp   % compile the mex file 
$ HK

$ cd baseline_codes/PR
$ matlab 
$ mex -largeArrayDims pprgrow_mex.cc   % compile the mex file 
$ PR

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://fsf.org/.

Please email to [email protected] or setup an issue if you have any problems or find any bugs.

Please cite our papers if you use the codes in your paper:

@inproceedings{shi2017local,
    author={Shi, Pan and He, Kun and Bindel, David and Hopcroft, John E},
    title={Local Lanczos Spectral Approximation for Community Detection},
    booktitle={Joint European Conference on Machine Learning and Knowledge Discovery in Databases},
    pages={651--667},
    year={2017},
    organization={Springer}
    } 

In the program, we incorporate some open source codes as baseline algorithms from the following websites:

• LOSP
• HK
• PR