Add OLMo 2 support (1B, macOS + iOS) - #232
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Co-authored-by: Prathamesh <46148373+pkmandke@users.noreply.github.com>
group_size 8 was unnecessarily fine; a wikitext PPL sweep at the model's native 4096 context shows 8/16/32 are equivalent within noise (17.18 / 17.09 / 17.23). group_size 16 halves the palettization LUT overhead versus 8 while holding quality (17.09). Update the README iOS 6-bit perplexity accordingly.
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Summary
x + norm(attn(x))) and flat QK-norm (RMSNorm over all head dims jointly before reshape)Evaluation
word_perplexityon WikiText-2, 4K context.float16)float16)Test plan