There was an old series of 10-20 videos, on a channel that back then was having only this class, an intro about neural networks and AI in general. Narrated by a feminine voice, full of diagrams and visual content, yet the focus was still on the content and not on the presentation. Short in length, 10-20 minutes/episode, more like a presentation than like a class.
It was especially well suited as a bird eye view over the whole AI field, with main type of NN, each episode about a certain type of NN, and what is the best use for each type (classifiers, speach recognition, text generators, etc.), with concise explanations about the internal of each.
I am searching for about an hour now, and couldn't find it any more. Maybe it was deleted.

Anybody else happened to know that series and has a link for it please?
Also, I've noticed in all the channel I am subscribed to, there are no videos older than 8 years.
Is this just a coincidence, or the older content is automatically removed from YouTube?