[andai]

Tap the contact's name in WhatsApp (I think it only works on a phone) and at the bottom of that screen there's Export Chat.

There was some post-processing needed to get it in this format:

    Alice: blah

    John: blah blah

Edit: OP's GitHub README has instructions for exporting & preprocessing.

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For finetuning GPT-2 I think we used this thing. I ran it on Google Colab. My friend ran it on his GPU, it should be doable on most modern-ish GPUs.

https://github.com/minimaxir/gpt-2-simple

I tried doing something with this a few months ago though and it was a bit of a hassle to get running (needed to use a specific python version for some dependencies...), I forget the details sorry!