Cudnn v4.0 L4T ARM64 download links to cudnn-7.0-linux-x64-v4.0.tar.gz
(on https://developer.nvidia.com/rdp/cudnn-download). I’ve verified that files included are for x86_64 using file.
CUDA on arm64 requires JetPack, or indirectly wget using the JetPack URLs.
Ah, didn’t realize. Also, already had it installed, but it was in /usr/lib/aarch64*/ and not /usr/local/cuda. Thanks for your help!