Add prototype of QLoRA#1800

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wanghaoshuang wants to merge 4 commits intoPaddlePaddle:developfrom

wanghaoshuang:lc

Commits on Oct 27, 2023

Add prototype of QLoRA
wanghaoshuang
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Commits on Nov 2, 2023

Commits on Nov 3, 2023

Add NF4 dequant cuda kernel
wanghaoshuang
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