We've released v0.2 of Swift for TensorFlow and it's running in Colab now.

You can follow the instructions at https://github.com/tensorflow/swift/blob/master/Usage.md#colaboratory to create a blank new Swift notebook.

There is also a tutorial in Swift (which you should be able to open in Colab by clicking the button) posted at https://www.tensorflow.org/swift/tutorials/model_training_walkthrough, and you can access other tutorials on the sidebar.

There still isn't a button in Colab itself for creating new Swift notebooks, though.

You can start using this link for now:

https://colab.research.google.com/notebook#create=true&language=swift