Edit: previous title was "Leetcode for ML" or somesuch...

I like the idea and might try some! But as a warning: leetcode is specifically aimed at prepping for interviews, and I've never seen questions like these in an interview (I'm somewhere between an MLE and ML researcher FWIW). The most common kinds of ML-specific things in my experience are:

- ML system design (basically everyone does this)

- ML knowledge questions ("explain ADAM etc.")

- probability + statistics knowledge

- ML problem solving in a notebook (quite rare, but some do it)