After upgrading P.Lightening to 1.2.3, remains other incompatibilities with torch 1.8.0. A workaround until is sorted out all, is to stick with torch 1.7.1.
thanks again @tiborkiss  but we'll close this one for now because we can't pin torch version to the exact number like 1.7.1 We could add something like this right before upload to pypi though.
… pull down 1.8.0. https://github.com/PyTorchLightning/pytorch-lightning/pull/6168

This diff temporarily solves the imported incompatibility reported in https://github.com/NVIDIA/NeMo/issues/1868
