Cool. Last year I created something like this as a Chrome extension so that you could type in your post and it would show up on reddit where to post. You could then just select it by clicking a link. Project is here https://github.com/wesbarnett/insight
Nice work @exegete! The Chrome extension idea is great ;) Nice to also see some metrics comparison. I will review your work. Looks like you achieved 0.6 accuracy with 600 classes. I got 0.4 f1-score on 4000 classes, but I have a ton of posts and subreddits with images and no text ;) For this case, it is also nice to report Recall@k. The current model has Recall@5 of 0.6. Meaning that on the test dataset, 60% of the time the human choice is within the first 5 suggestions. Currently, it is not supposed to automatically post but help the user discover new subreddits :)
I will probably retrain it on more subreddits, and fine tune a few things.