# Surrogates.jl: How to get the effect of "forgetting" or decaying importance of old observations?

**URL:** <https://discourse.julialang.org/t/surrogates-jl-how-to-get-the-effect-of-forgetting-or-decaying-importance-of-old-observations/118178>\
**Category:** Optimization (Mathematical)\
**Tags:** question, sciml\
**Created:** [August 14, 2024, 11:55am UTC](https://discourse.julialang.org/t/surrogates-jl-how-to-get-the-effect-of-forgetting-or-decaying-importance-of-old-observations/118178 "2024-08-14T11:55:05Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![A112s](https://avatars.discourse-cdn.com/v4/letter/a/59ef9b/32.png) [@A112s](https://discourse.julialang.org/u/A112s)\
**Post date:** [August 14, 2024, 11:55am UTC](https://discourse.julialang.org/t/surrogates-jl-how-to-get-the-effect-of-forgetting-or-decaying-importance-of-old-observations/118178/1 "2024-08-14T11:55:05Z")

</div>

I want to use Surrogates.jl to select hyperparameters for a function, which I know that behaves its behavior significantly over time.

Is there a built-in way to model such process with Surrogates.jl?