## SNAP/com-Youtube

SNAP network: Youtube social network and ground-truth communities

Name | com-Youtube |
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Group | SNAP |

Matrix ID | 2783 |

Num Rows | 1,134,890 |

Num Cols | 1,134,890 |

Nonzeros | 5,975,248 |

Pattern Entries | 5,975,248 |

Kind | Undirected Graph With Communities |

Symmetric | Yes |

Date | 2012 |

Author | J. Yang, J. Leskovec |

Editor | J. Leskovec |

Download | MATLAB Rutherford Boeing Matrix Market |
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Notes |
SNAP (Stanford Network Analysis Platform) Large Network Dataset Collection, Jure Leskovec and Anrej Krevl, http://snap.stanford.edu/data, June 2014. email: jure at cs.stanford.edu Youtube social network and ground-truth communities https://snap.stanford.edu/data/com-Youtube.html Dataset information Youtube (http://www.youtube.com/) is a video-sharing web site that includes a social network. In the Youtube social network, users form friendship each other and users can create groups which other users can join. We consider such user-defined groups as ground-truth communities. This data is provided by Alan Mislove et al. (http://socialnetworks.mpi-sws.org/data-imc2007.html) We regard each connected component in a group as a separate ground-truth community. We remove the ground-truth communities which have less than 3 nodes. We also provide the top 5,000 communities with highest quality which are described in our paper (http://arxiv.org/abs/1205.6233). As for the network, we provide the largest connected component. Network statistics Nodes 1,134,890 Edges 2,987,624 Nodes in largest WCC 1134890 (1.000) Edges in largest WCC 2987624 (1.000) Nodes in largest SCC 1134890 (1.000) Edges in largest SCC 2987624 (1.000) Average clustering coefficient 0.0808 Number of triangles 3056386 Fraction of closed triangles 0.002081 Diameter (longest shortest path) 20 90-percentile effective diameter 6.5 Community statistics Number of communities 8,385 Average community size 13.50 Average membership size 0.10 Source (citation) J. Yang and J. Leskovec. Defining and Evaluating Network Communities based on Ground-truth. ICDM, 2012. http://arxiv.org/abs/1205.6233 Files File Description com-youtube.ungraph.txt.gz Undirected Youtube network com-youtube.all.cmty.txt.gz Youtube communities com-youtube.top5000.cmty.txt.gz Youtube communities (Top 5,000) --------------------------------------------------------------------------- Notes on inclusion into the SuiteSparse Matrix Collection, July 2018: --------------------------------------------------------------------------- The graph in the SNAP data set is 1-based, with nodes numbered 1 to 1,157,827. In the SuiteSparse Matrix Collection, Problem.A is the undirected Youtube network, a matrix of size n-by-n with n=1,134,890, which is the number of unique user id's appearing in any edge. Problem.aux.nodeid is a list of the node id's that appear in the SNAP data set. A(i,j)=1 if person nodeid(i) is friends with person nodeid(j). The node id's are the same as the SNAP data set (1-based). C = Problem.aux.Communities_all is a sparse matrix of size n by 16,386 which represents the communities in the com-youtube.all.cmty.txt file. The kth line in that file defines the kth community, and is the column C(:,k), where C(i,k)=1 if person nodeid(i) is in the kth community. Row C(i,:) and row/column i of the A matrix thus refer to the same person, nodeid(i). Ctop = Problem.aux.Communities_top5000 is n-by-5000, with the same structure as the C array above, with the content of the com-youtube.top5000.cmty.txt.gz file. |