Unlearn vs Sparse

To run the unlearn methods

python -u main_forget.py --save_dir ${save_dir} --mask ${path_of_model} --unlearn ${unlearn methods} --epochs ${epochs} --lr ${lr} | tee xxx.log

To run the test on the unlearn methods

(need to be reformulated further) python -u main_test.py --save_dir ${save_dir} --mask ${path_of_model}