Hello,
I was recently troubleshooting this issue, and indeed this means that your pytorch version is too new for this model. As mentioned in Relion 4 GitHub page, (https://github.com/3dem/relion/tree/ver4.0) the classranker model was made with:
Python 3.9.12 with Pytorch 1.10.0 and Numpy 1.20.0
So you can fix it as follows (using conda):
conda create --name relion_torch python=3.9
conda activate relion_torch
conda install pytorch=1.10.0
When you want to run the automatic class ranker in Relion 4 GUI you need to provide the path to the python from this newly created environment. Run the following commands:
conda activate relion_torch
which python
Hope this helps!
Best wishes,
Vadim Kotov
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