No that is for CuDNN, you’ll be OK if you use the “native” (PyTorch) version.
Two caveats

If you feed “invalid” (targets to long for input length) samples, you probably want the zero_infinity option from PyTorch nightlies. This will very likely be the source of your difficulties.
GPU CTC doesn’t like zero length targets currently (sorry, it’s on my to-do list).

Best regards
Thomas