Networkx & Gephi Tutorial#pydata
Gilad Lotan | @gilgul
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Politicos
OSU Students
Ohio based Media
• Node network properties– from immediate connections
• indegreehow many directed edges (arcs) are incident on a node
• outdegreehow many directed edges (arcs) originate at a node
• degree (in or out)number of edges incident on a node
– from the entire graph• centrality (betweenness, closeness)
outdegree=2
indegree=3
degree=5
Source: Lada Adamic (SI508-F08)
Example Graph Types
• Complete Graph
• Bipartite Graph– Vertices can be divided into two disjoint sets– Ex: students & schools
Social Network Attributes• Scale Free
– Degree distribution follows a power law– Barabasi et al (‘99): mapped the topology of a portion of
the web
• Small World– Most nodes are not neighbors, but can be reached by
small number of hops– Watts & Strogatz (’98)– Properties: cliques, sub networks with high clustering
coefficient, most pairs of nodes connected by at least one short path
(Zachary) Karate club graph
social network of friendships between 34 members of a karate club at a US university in the 1970s.
Standard test network for clustering algorithms -> during the observation period the club broke up into two separate clubs over a conflict.
Graph Measures• Centrality
– Betweenness– Closeness– Eigenvector– Degree
• Clustering Coefficient (clique)• Modularity
Graph Layout• Open Ord
– Better distinguishes clusters• Yifan Hu• Force Atlas• Fruchterman Reingold
– Graph as a system of mass particles (nodes:particles, edges:springs)
Networkx
Graph Generators
Generate Twitter Graph
graphml file
nodes
edges
Twitter Users with Python in their Bios
• 2 days of Twitter data (Oct 24th and 25th)• Total: 4246 users (62k tweets)• @mikanyan1 tweeted 795 times
Pythonistas on Twitter
Pythonistas on Twitter
English / European
Japanese
Python(the snake)
Chinese
Spanish Speakers
Musicians, Artists
Twitter User Community: Data Science
• Grepped from Twitter bios over 1 week: "data science|data scientist|machine learning|data strateg”
• 1053 Users• 14k Tweets• Most tweeting users:
– @data_nerd (659)– @Chantel_Esworth (562)– @Da5_12 (253)
Dataists on Twitter
Thank You
Gilad LotanTwitter: @gilgul
Github: giladlotan
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