There is no fixed team size for AI development projects. Depending on your requirements, the team composition in an AI project may vary. Also, note that the AI development team may not need to be limited to data scientists and a scrum master. If you need your AI models to integrate with a system you already use, you will need a software engineer(s). If you need to build new dashboards, interfaces, or whole apps to allow for easy use of the model, you will also need designers.