These codes are for our paper "Krylov Subspace Approximation for Local Community Detection in Large Networks"

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/)
• Biology datasets (available at http://cb.csail.mit.edu/cb/mna/isobase/)
• 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 LOSP_Plus_codes
$ matlab 
$ mex -largeArrayDims GetLocalCond.c   % compile the mex file 
$ LOSP_Plus(WalkMode,d,k,alpha,TruncateMode,beta) 

WalkMode: 1: standard, 2: light lazy, 3: lazy, 4: personalized (default: 2)

d: dimension of local spectral subspace (default: 2)

k: number of random walk steps (default: 3)

alpha: a parameter controls random walk diffusion (default: 1)

TruncateMode: 1: truncation by truth size, 2: truncation by local minimal conductance (default: 2)

beta: a parameter controls local minimal conductance (default: 1.02)

$ cd baseline_codes/LEMON
$ matlab 
$ LEMON

$ cd baseline_codes/PGDc-d
$ matlab
$ PGDC_d

$ 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

$ cd LOSP_Plus_codes
$ matlab 
$ GLOSP_Plus   % GLOSP algorithm using eigenspace rather than Krylov subspace

$ cd LOSP_Plus_codes
$ matlab
$ mex -largeArrayDims hkvec_mex.cpp   % compile mex file
$ mex -largeArrayDims pprvec_mex.cc   % compile mex file
$ HK_local    % HKL algorithm based on local minimal conductance truncation
$ PR_local    % PRL algorithm based on local minimal conductance truncation

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.

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

• LEMON
• PGDC-d
• HK
• PR