If you are interested in machine learning then it's time to learn Swift.
Check out the blog post by google about their open source machine learning framework TensorFlow being supported with Swift language: https://medium.com/tensorflow/introducing-swift-for-tensorflow-b75722c58df0
It's an open source project: https://github.com/tensorflow/swift
which you can also contribute.
Check these also: https://www.tensorflow.org/community/swift
Other advantages of Learning Swift is you can use it for server side programming, check this https://developer.ibm.com/swift/
TensorFlow is one of the most popular programming frameworks developers can use to set up and run machine learning models at scale. It contains useful abstractions for that task, so it’s easier for developers to get their AI code up and running without having to reinvent the wheel.
Swift is a general-purpose programming language built using a modern approach to safety, performance, and software design patterns. The goal of the Swift project is to create the best available language for uses ranging from systems programming, to mobile and desktop apps, scaling up to cloud services. Most importantly, Swift is designed to make writing and maintaining correct programs easier for the developer.