GX aims at defining a strongly typed programming language to define functions operating on arrays and running on accelerators such as GPUs, TPUs. A key difference with Python and many programming languages is that array dimension are part of the type of an object. Also, GX aims at being easy to integrate with existing programming language such as Go, Python, or C++ by providing utilities to generate bindings.
This is not an official Google DeepMind product (experimental or otherwise), it is just code that happens to be owned by Google-DeepMind. GX is experimental and work in progress. As of today, we do not consider any part of the language as stable. Breaking changes will happen on a regular basis.
You are welcome to send PR or to report bugs. We will do our best to answer but there is no guarantee that you will get a response.