[WIP] nb3

[ericmjl]

Working on it! Please do not review until I request it.

[ericmjl]

@hugobowne this is a mega-PR by my usual standards, apologies if it's a lot to review, but I think I'm ready for your comments! (If they're all small & minor comments, then let's just merge and work through them in person.)

[ericmjl]

@hugobowne an update I'm really excited about!!!

On the plane this morning, I finally wrote down what had been simmering in my mind for the longest time since reading Judea Pearl's book - that our "regression" tasks (linear/logistic regression; fitting exponential decay curves and IC50 curves, and deep learning) are all fundamentally the same activity - (straight or bendy) CURVE FITTING! 🤣🤣🤣

I thus took the chance to write it down as a "bonus" notebook for our tutorial participants. If we get there, then great; otherwise, I'm ok with leaving it in as a "bonus" material thingy for them.

Apologies in advance if this seemed like a trivial point to you already... but it hit me at the speed of Elon Musk's Roadster in space that I couldn't resist putting it in. You'll see this in the PR history.

[hugobowne]

@ericmjl i'll get to this tomorrow on the plane.

re curve fitting sounds great to me

[hugobowne]

@ericmjl this is bloody awesome! Feel free to merge.