Cultural scene detection using reverse Louvain optimization

• Formalized an ontology for graphing socio-cultural “scenes” in Meetup data.
• Created a k-partite, directed “scene graph” of all data (people, place, topic).
• Applied Louvain optimization recursively “in reverse” to partition the graph.
• Compared with overlap analysis of three weighted, undirected graphs.
• “Reverse Louvain” offered same precision, better recall of scene data.

This paper proposes a novel approach for discovering cultural scenes in social network data. “Cultural scenes” are aggregations of people with overlapping interests, whose loosely interacting activities from virtuous cycles amplify cultural output (e.g., New York art scene, Silicon Valley startup scene, Seattle indie music scene). They are defined by time, place, topics, people and values. The positive socioeconomic impact of scenes draws public and private sector support to them. They could also become the focus for new digital services that fit their dynamics; but their loose, multidimensional nature makes it hard to determine their boundaries and community structure using standard social network analysis procedures. In this paper, we: (1) propose an ontology for representing cultural scenes, (2) map a dataset to the ontology, and (3) compare two methods for detecting scenes in the dataset. The first method takes a hard clustering approach. We derive three weighted, undirected graphs from three similarity analyses; linking people by topics, topics by people, and places by people. We partition each graph using Louvain optimization, overlap them, and let their inner joint represent core scene elements. The second method introduces a novel soft clustering approach. We create a “scene graph”: a single, unweighted, directed graph including all three node classes (people, places, topics). We devise a new way to apply Louvain optimization to such a graph, and use filtering and fan-in/out analysis to identify the core. Both methods detect core clusters with precision, but Method One misses some peripherals. Method Two evinces better recall, advancing our knowledge about how to represent and analyze scenes. We use Louvain optimization recursively to successfully find small clusters.