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rlwe: add polynomial approx for sigmoid functions #942

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asraa opened this issue Aug 26, 2024 · 0 comments · Fixed by #955
Closed

rlwe: add polynomial approx for sigmoid functions #942

asraa opened this issue Aug 26, 2024 · 0 comments · Fixed by #955
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@lawrencekhlim

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asraa commented Aug 26, 2024

https://eprint.iacr.org/2018/462.pdf

This paper uses a degree 3 polynomial approximation for sigmoid (useful in the interval [-5, 5]). It also has a degree 1 approximation with more loss, but it's there.

This would be useful to use for some NN models trained with sigmoids.

cc @lawrencekhlim

Related: #658
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Lower Tosa Sigmoid to Secret Arith via 3-degree Polynomial Approximation google/heir
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