algorithmia.com offers over 4000 AI/ML models as Serverless AI Layers, which could be easy integrated in most kind of application.
The Gearman magazine heise.de posted shortly an article DanKu-Blockchain-Handel-mit-Machine-Learning-Modellen.
The matter is described in algorithmia.com blog precisely Evaluating and Exchanging Machine Learning Models on the Ethereum Blockchain