Scikit-network

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* Added betweenness algorithm by Tiphaine Viard (444)

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* Added Louvain-based embedding
* Fix documentation with new dataset website URLs

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* Fix documentation with new dataset website URLs.

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* Fix visualization features
* Fix documentation

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* Added link prediction module
* Added pie-node visualization of memberships
* Added Weisfeiler-Lehman graph coloring by Pierre Pebereau and Alexis Barreaux (394)
* Added Force Atlas 2 graph layout by Victor Manach and Rémi Jaylet (396)
* Added triangle listing algorithm for directed and undirected graph by Julien Simonnet and Yohann Robert (376)
* Added k-core decomposition algorithm by Julien Simonnet and Yohann Robert (377)
* Added k-clique listing algorithm by Julien Simonnet and Yohann Robert (377)
* Added color map option in visualization module
* Updated NetSet URL

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* Added Katz centrality
* Refactor connectivity module into paths and topology
* Refactor Diffusion into Dirichlet
* Added parsers for adjacency list TSV and GraphML
* Added shortest paths and distances