Gephi short introduction

Gephi short introduction

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  Sébastien Heymann <[email protected]>
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  Exploratory Network Analysis 2 interact in real time 1 see the network Gephi prototype (2008) 1st graph viz tool: Pajek (1996) group, filter, compute metrics... Vladimir Batagelj, Andrej Mrvar 3 build a visual language size by rank, color by partition, label, curved edges, thickness...
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  Looking for Ordernessin Data Make varying 3 cursors simultaneously to extract meaningful patterns (statistical and structural properties) MICRO level MACRO level at different levels 1 dimension N dimensions on multiple dimensions T+0 T+N at time scale
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  “Zoom” cursor onQuantitative Data MICRO level MACRO level Global - connectivity - density - centralization Local - communities - bridges between communities - local centers vs periphery Individual - centrality - distances - neighborhood - location - local authority vs hub
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  “Crossing” cursor onQualitative Data 1 dimension N dimensions Social - who with whom - communities - brokerage - influence and power - homophily Semantic - topics - thematic clusters Geographic - spatial phenomena
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  “Timeline” cursor onTemporal Data T+0 T+N Evolution of social ties Evolution of communities Evolution of topics
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  Mapping an InnovationCenter Collaborations on projects at Images et Réseaux Themes and content Actors Territory Franck Ghitalla & Ecole de Design de Nantes
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  Gephi in aNutshell « Like Photoshop™ for graphs. » Helps data analysts to reveal patterns and trends, highlight outliers and tells story with their data. • Network visualization platform • Open source, supported by a community • Built for performance and usability • Extensible by plug-ins • Windows, MacOS X, Linux
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  Gephi Community Nonprofit organization Communities Contributors Mathieu Bastian, Mathieu Jacomy, Eduardo Ramos Ibañez, Sébastien Heymann, Guillaume Ceccarelli, André Panisson, Antonio Patriarca, Cezary Bartosiak, Martin Škurla, Patrick McSweeney, Yi Du, Hélder Suzuki, Daniel Bernardes, Ernesto Aneiro, Keheliya Gallaba, Luiz Ribeiro, Urban Škudnik, Vojtech Bardiovsky, Yudi Xue
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  Community Mission Provide a “sustainable” software Maintain the technical ecosystem Build a business ecosystem Face cutting-edge technological challenges with a long-term vision Distribute the software in Open Source
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  Community Values Open innovation: ideas and features come from the entire community. Decisions are taken with transparency. We consider this technology as a public good, and will keep it in open source.
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  Diversity of Usages business leisure :-) communication academic art
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  Diversity of NetworkEncoding V = { a, b, c, d, e } <graph> E = { (a,b), (a,d), (b,c), (e,a), (c,e) } <nodes> <node id=”a” /> <node id=”b” /> Textual <node id=”c” /> <node id=”d” /> <node id=”e” /> </nodes> <edges> <edge source=”a” target=”b” /> <edge source=”a” target=”d” /> a b c d e <edge source=”b” target=”c” /> a - 1 - 1 - <edge source=”e” target=”a” /> <edge source=”c” target=”e” /> b - - 1 - - </edges> c - - - - 1 </graph> d - - - - - e 1 - - - - XML Graphical Tabular and many others...
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  Software I/O } MySQL PostgreSL SQL Server databases user input Neo4j CSV CSV Pajek NET Pajek NET file Guess GDF Guess GDF > GEXF GEXF GraphML GraphML file Graphviz DOT Excel Spreadsheet UCInet DL SVG NetdrawVNA PDF Tulip TLP PNG Excel Spreadsheet graph streaming