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  "networkx_version": "3.7",
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      "slug": "caida-as-relationships",
      "title": "Internet AS-level topology",
      "domain": "Internet",
      "description": "Autonomous Systems of the Internet and their inferred business relationships (CAIDA serial-1 snapshot 20260901). The innermost shells hold the large transit and content networks; the periphery is stub networks with one or two providers.",
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      "source_url": "https://www.caida.org/catalog/datasets/as-relationships/",
      "download_url": "https://publicdata.caida.org/datasets/as-relationships/serial-1/20260901.as-rel.txt.bz2",
      "license": "CAIDA Acceptable Use Agreement (public data, attribution required)",
      "citation": "CAIDA, The CAIDA AS Relationships Dataset, 20260901.",
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        "kdenses"
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    {
      "slug": "facebook-ego",
      "title": "Facebook friendship circles",
      "domain": "Social",
      "description": "Friendship links from ten Facebook ego networks (anonymized survey participants and their friends). Dense friend groups appear as deep cores; the k-dense view isolates the triangle-rich cliques.",
      "source_name": "SNAP: ego-Facebook",
      "source_url": "https://snap.stanford.edu/data/ego-Facebook.html",
      "download_url": "https://snap.stanford.edu/data/facebook_combined.txt.gz",
      "license": "SNAP datasets are free for research use (attribution requested)",
      "citation": "J. McAuley and J. Leskovec, Learning to Discover Social Circles in Ego Networks, NIPS 2012.",
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      "slug": "arxiv-grqc",
      "title": "arXiv General Relativity co-authorship",
      "domain": "Science",
      "description": "Scientists who co-authored papers in the arXiv General Relativity and Quantum Cosmology category (1993-2003). Collaboration networks are shallow: a few tight groups form the core and most authors sit in the outer shells.",
      "source_name": "SNAP: ca-GrQc",
      "source_url": "https://snap.stanford.edu/data/ca-GrQc.html",
      "download_url": "https://snap.stanford.edu/data/ca-GrQc.txt.gz",
      "license": "SNAP datasets are free for research use (attribution requested)",
      "citation": "J. Leskovec, J. Kleinberg and C. Faloutsos, Graph Evolution: Densification and Shrinking Diameters, ACM TKDD 2007.",
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          "num_shells": 27,
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    },
    {
      "slug": "arxiv-astroph",
      "title": "arXiv Astrophysics co-authorship",
      "domain": "Science",
      "description": "Co-authorship among arXiv Astrophysics authors (1993-2003). Large collaborations (instrument and survey teams) produce a much deeper core than General Relativity.",
      "source_name": "SNAP: ca-AstroPh",
      "source_url": "https://snap.stanford.edu/data/ca-AstroPh.html",
      "download_url": "https://snap.stanford.edu/data/ca-AstroPh.txt.gz",
      "license": "SNAP datasets are free for research use (attribution requested)",
      "citation": "J. Leskovec, J. Kleinberg and C. Faloutsos, Graph Evolution: Densification and Shrinking Diameters, ACM TKDD 2007.",
      "directed": false,
      "decompositions": [
        "kcores"
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          "thumbnail": "arxiv-astroph-kcores-thumb.jpg",
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          "nodes": 18772,
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          "max_index": 56,
          "min_index": 0,
          "num_shells": 53,
          "nodes_in_max_core": 57,
          "render_seconds": 5.7
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      ]
    },
    {
      "slug": "email-eu-core",
      "title": "E-mail exchanges in a European research institution",
      "domain": "Communication",
      "description": "Who e-mailed whom inside a large European research institution over 18 months. Directed edges make it a natural d-core example; the undirected k-core view is shown for comparison.",
      "source_name": "SNAP: email-Eu-core",
      "source_url": "https://snap.stanford.edu/data/email-Eu-core.html",
      "download_url": "https://snap.stanford.edu/data/email-Eu-core.txt.gz",
      "license": "SNAP datasets are free for research use (attribution requested)",
      "citation": "H. Yin, A. R. Benson, J. Leskovec and D. F. Gleich, Local Higher-order Graph Clustering, KDD 2017.",
      "directed": true,
      "decompositions": [
        "dcores",
        "kcores"
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          "thumbnail": "email-eu-core-dcores-thumb.jpg",
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          "max_index": 27,
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        },
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          "thumbnail": "email-eu-core-kcores-thumb.jpg",
          "image_bytes": 1091446,
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          "max_index": 34,
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          "num_shells": 35,
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    },
    {
      "slug": "wikipedia-votes",
      "title": "Wikipedia administrator elections",
      "domain": "Social",
      "description": "Votes cast in Wikipedia requests for adminship: a directed edge from voter to candidate. The d-core decomposition separates prolific voters from candidates who collect many votes.",
      "source_name": "SNAP: wiki-Vote",
      "source_url": "https://snap.stanford.edu/data/wiki-Vote.html",
      "download_url": "https://snap.stanford.edu/data/wiki-Vote.txt.gz",
      "license": "SNAP datasets are free for research use (attribution requested)",
      "citation": "J. Leskovec, D. Huttenlocher and J. Kleinberg, Signed Networks in Social Media, CHI 2010.",
      "directed": true,
      "decompositions": [
        "dcores"
      ],
      "renders": [
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          "image": "wikipedia-votes-dcores.png",
          "thumbnail": "wikipedia-votes-dcores-thumb.jpg",
          "image_bytes": 1370507,
          "nodes": 7115,
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          "max_index": 19,
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          "num_shells": 20,
          "nodes_in_max_core": 580,
          "render_seconds": 3.6
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      ]
    },
    {
      "slug": "gnutella-p2p",
      "title": "Gnutella peer-to-peer overlay",
      "domain": "Technology",
      "description": "A snapshot of the Gnutella file-sharing overlay from August 2002 (hosts and their connections). Engineered overlays have a flat core structure compared with social or Internet graphs.",
      "source_name": "SNAP: p2p-Gnutella08",
      "source_url": "https://snap.stanford.edu/data/p2p-Gnutella08.html",
      "download_url": "https://snap.stanford.edu/data/p2p-Gnutella08.txt.gz",
      "license": "SNAP datasets are free for research use (attribution requested)",
      "citation": "M. Ripeanu, I. Foster and A. Iamnitchi, Mapping the Gnutella Network, IEEE Internet Computing 2002.",
      "directed": true,
      "decompositions": [
        "kcores"
      ],
      "renders": [
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          "image": "gnutella-p2p-kcores.png",
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          "image_bytes": 930487,
          "nodes": 6301,
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          "max_index": 10,
          "min_index": 1,
          "num_shells": 10,
          "nodes_in_max_core": 268,
          "render_seconds": 1.5
        }
      ]
    },
    {
      "slug": "karate-club",
      "title": "Zachary's karate club",
      "domain": "Social",
      "description": "The classic 34-member karate club studied by Wayne Zachary in 1977, bundled with NetworkX. Small enough to read every node; the two factions occupy the two halves of the outer shells.",
      "source_name": "NetworkX: karate_club_graph",
      "source_url": "https://networkx.org/documentation/stable/reference/generated/networkx.generators.social.karate_club_graph.html",
      "download_url": null,
      "license": "Public domain data; NetworkX is BSD-3-Clause",
      "citation": "W. W. Zachary, An Information Flow Model for Conflict and Fission in Small Groups, Journal of Anthropological Research 1977.",
      "directed": false,
      "decompositions": [
        "kcores"
      ],
      "renders": [
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          "image": "karate-club-kcores.png",
          "thumbnail": "karate-club-kcores-thumb.jpg",
          "image_bytes": 119645,
          "nodes": 34,
          "edges": 78,
          "max_index": 4,
          "min_index": 1,
          "num_shells": 4,
          "nodes_in_max_core": 10,
          "render_seconds": 0.2
        }
      ]
    }
  ]
}