The DARPA SocialSim Challenge: Massive Multi-Agent Simulations of the Github Ecosystem

We model the evolution of GitHub, a large collaborative software-development ecosystem, using massive multi-agent simulations as a part of DARPA's SocialSim program. Our best performing models and our agent-based simulation framework are described here. Six different agent models were tested based on a variety of machine learning and statistical methods. The most successful models are based on sampling from a stationary probability distribution of actions and repositories for each agent.