question: Is pytorch lightning using MKLDNN when no GPU is available ?
context: Hi,
  I was wondering if PL can use mkldnn/dnnl/onednn ? I may be mistaken, but it seems pytorch does not default to it and there is no explicit mention of it inside PL's code. If it's not, is there a way to enable it ?
  Alexandre
answer: No, unfortunately, MKL-DNN is currently not supported
  Duplicate of #6020