New 'advanced' category - please use it for anything not suitable for beginners ✅

I’ve just added a new “advanced” subcategory. Here’s a direct link: #part1-v3:part1-v3-adv . Here’s the summary:

If your question or comment is not suitable for people who have not studied deep learning before, please use this category to ask it. Note that in order to avoid being overwhelmed by advanced questions if you are new to deep learning, you can use the “subcategory” drop-down to select “none” - meaning that no subcategories will appear.

Note that for folks just getting started, it can be really intimidating if everyone is discussing topics not suitable for beginners - so please help us out by using the subcategory as appropriate. Thanks!