AssertionError: Not enough GPU hardware devices available

This error occurs when there are not enough available GPU devices for your code to run on. This can happen if all the available GPUs are being used by other processes, or if your code is requesting more GPUs than are available on your system.

To resolve this issue, you can try the following:

1. Check if other processes are using the GPUs and stop them if possible.
2. Reduce the number of GPUs requested by your code.
3. Increase the number of GPUs on your system, if possible.
4. Use a cloud-based GPU service that provides more GPUs than your local system.