"ModuleNotFoundError: No module named 'transformer'"

"from transformer import decoder_stack" lead to the above error. I tried deactivating and then reactivating my virtual environment without success. I tried 'pip3 install transformers' without success. I get "Python 3.11.3 (v3.11.3:f3909b8bc8, Apr 4 2023, 20:12:10) [Clang 13.0.0 (clang-1300.0.29.30)] on darwin" if I run 'python. I am running a script that needs to import 'alphageometry.py' but not run 'run.sh' in the folder where every AlphaGeometry Github files lie. I use Mac with VScode.