We saw a PredictionIO setup and a unified recommender example. That brings us to the end of Building a Recommendation Engine with Scala. We hope you have gained enough ground, so that you can now start building your own recommendation engines using the Scala programming language. Creating real-world recommendation engines is a complex task, and rightly so, we can't possibly cover each and every detail in a single book. We gave you a bird's eye view of what's available and what's possible. It has been a great journey and we hope that this book helps you explore advanced tools and techniques using Scala programming language. Good luck!