Hmm maybe this is the issue, :

Conda error: UnsatisfiableError: The following specifications were found to be incompatible with a past
explicit spec that is not an explicit spec in this operation (cudatoolkit):

  - pytorch~=1.8.0 -> cudatoolkit[version='>=10.1,<10.2|>=10.2,<10.3']

This makes no sense, conda is saying pytorch=1.8 needs cudatoolkit <10.2/10.3 but actually it needs cudatoolkit 11.1