Constraint that makes parameters sum to one?

[peanutcream]

Hello,

I am wondering whether param provides a function that constrains specified parameters sum to one? For example, if I have two parameters, say pi_1 and pi_2, I want pi_1 + pi_2 = 1.

Maybe does tie_to() implement this? (Couldnt find an explanation on tie)

Best,
pc

[Rheotab]

Hi, I have the same issue. I tried to use a custom optimizer which can handle non-linear constraints but I have some troubles dealing with paramz.transformations.

I think it's a bit late but did you find any solutions ?
Best,
Rheo