The fherma-ai repo implements the logistic function over CKKS with DESILO FHE, using a degree-77 Chebyshev projection on [-25, 25] that reaches 3.6e-5 error against a 1e-4 bar, in 8 levels. It computes coefficients rather than copying polycircuit's hand-unrolled series as the OpenFHE answers do, which matters when reading the FHERMA board.
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Oct 7 · 3 of 4 shown- Logistic uses a degree-77 Chebyshev projection with 3.6e-5 error against a 1e-4 bar, in 8 levels.
- ReLU and sign reuse polycircuit's challenge-winning polynomials, so board differences reflect the library, not the method.
- Sign reaches 0.0033 error using 11 of 12 levels; ReLU's worst error is 0.030 at N = 1024.
The fherma-ai repo evaluates polycircuit's order-16 MILP-optimised ReLU polynomial, winner of the FHERMA ReLU challenge's depth-constrained track, with DESILO FHE at ring 2^14 and a 5-level budget. It reaches 0.030 worst error and 88.3% of elements within 1e-3 at N = 1024, so board differences come from the library, not the method.
The fherma-ai repo evaluates Aikata's challenge-winning degree-1023 Chebyshev sign approximation from polycircuit's SignEvaluation component in a single DESILO FHE call. It reaches 0.0033 error at N = 1024 against the polynomial's own 0.0037, using 11 of 12 levels, giving a library-to-library comparison on the same polynomial.
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