update: I made a new release: fastai-1.0.3 which includes this dependency.
If you could kindly re-run the complete install from scratch and the newly made (again) environment and report results that would be very helpful:
conda create -y --name fastai_v3
conda activate fastai_v3
conda install -y -c pytorch -c fastai fastai pytorch-nightly cuda92
conda uninstall -y fastai
pip install -e .