~/anaconda3/envs/main/lib/python3.7/site-packages/
now this editable install will reside where you clone the folder to, e.g. ~/transformers/ and python will search it too.
Do note that you have to keep that transformers folder around and not delete it to continue using the  transformers library.
Now, let's get to the real benefit of this installation approach. Say, you saw some new feature has been just committed into master. If you have already performed all the steps above, to update your transformers to include all the latest commits, all you need to do is to cd into that cloned repository folder and update the clone to the latest version:
cd ~/transformers/
git pull
There is nothing else to do. Your python environment will find the bleeding edge version of transformers on the next run.
