[D] Mamba model walkthrough

I really enjoyed the [Mamba paper](https://arxiv.org/abs/2312.00752), but it wasn't a particularly easy read for me since I had little prior exposure to a lot of prerequisite material (state space modeling, parallel scans, etc).

I wrote up an explainer (link [here](https://jameschen.io/jekyll/update/2024/02/12/mamba.html)), and I'm curious if folks have any feedback or find it helpful/interesting.

This was partially an exercise in solidifying my own understanding, but also something I was hoping could be good for the community since there aren't very many tutorials …

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