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Can I operate forever on the CKKS scheme, or there's a limit for re-scaling?

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It looks like on BFV, I can always relinearize and keep doing operations on numbers. However, on CKKS, when we multiply 2 values together, their scale gets multiplied also. So we end up having to re-escale by doing modulus switching (taking off one of the primes of the RNS representation of the ciphertext):

The number of primes limits how many rescalings can be done, and thus limits the multiplicative depth of the computation.

Does that mean that on the CKKS scheme we can only run circuits with small quantity of operations? Then I have to decrypt and re-encrypt the number? Wouldn't it be bad for training machine learning algorithms?

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