Bootstrapping for CKKS over the conjugate-invariant ring

[caesaretos]

Hi,

I am interested in bootstrapping for the conjugate-invariant CKKS scheme for a real-number machine learning application. Achieving a factor of 2 in amortized time and plaintext space is appealing for my use case.

It seems that Lattigo does not support bootstrapping for the conjugate-invariant ring CKKS variant. I tried myself a sample code based on the example/ckks/bootstrapping/main.go and specified the RingType as ring.ConjugateInvariant but I received the following error:
error message: panic: NewParametersFromLiteral: invalid ring.RingType: must be ring.Standard.

Based on this, I assume that it is not supported? If it is not supported, are there any known challenges to implementing this capability?

[Pro7ech]

Unfortunately I can confirm that the v4.1 of Lattigo does not support bootstrapping for the Real-CKKS, only for the Complex-CKKS, but we will keep you posted if we have an update on this front.