Tensorflow does officially support ROCm. The project was started by AMD and later upstreamed.

https://github.com/tensorflow/tensorflow/tree/master/tensorf...

https://github.com/tensorflow/tensorflow/blob/master/tensorf...

It is true that it is not Google who are distributing binaries compiled with ROCm support through PyPI (tensorflow and tensorflow-gpu is uploaded by Google, but tensorflow-rocm is uploaded by AMD). Is this what you meant by "not officially supporting"?