demo.m: Give an example on how to run the code for the set-expansion community detection
		of the citeseer network

extract_comp.m: Extract the connected component of a network given a vertex, which is to
		preprocess networks

d_norm_err_stat: The main algorithm to compute the recalls and ranking lists of different 
		PR methods with degree normalization. One may specify the parameters for IPR, PPR, 
		HPR. Check the example showed in demo.m

d_norm_err_stat: The main algorithm to compute the recalls and ranking lists of different 
		PR methods without degree normalization. One may specify the parameters for IPR,
		PPR, HPR. Check the example showed in demo.m