[P] char-mamba: Simple Mamba-based Character-level Language Modeling

I've created a simple script that trains a [Mamba](https://arxiv.org/abs/2312.00752) model for character-level language modeling. It can be considered the Mamba version of the popular [char-rnn](https://github.com/karpathy/char-rnn) repository.

[GitHub Repository](https://github.com/necrashter/char-mamba)

Any plain text file can be used as a dataset. By default, it will automatically download and use the [Tiny Shakespeare dataset](https://raw.githubusercontent.com/karpathy/char-rnn/master/data/tinyshakespeare/input.txt).

Since the code is quite simple, it can be also used as a **template for training Mamba models from scratch**, applicable to a wide array of sequence-to-sequence problems.

I hope …

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