cannot import name 'acquisition' from 'bayes_opt'

[dinghly]

Hello, I am trying to reproduce the section exploitation vs exploration from https://bayesian-optimization.github.io/BayesianOptimization/exploitation_vs_exploration.html#Acquisition-Function-%22Upper-Confidence-Bound%22

I have installed bayesian optimization 1.5.1 and whenever I am trying to import acquisition by typing

from bayes_opt import acquisition,

it returns

ImportError: cannot import name 'acquisition' from 'bayes_opt' (C:\Users\ldhy9\AppData\Local\Programs\Python\Python311\Lib\site-packages\bayes_opt_init_.py)

can you help why?

thank you

[till-m]

Hi @dinghly,

you're very fast! We merged a PR recently that changed the acquisition function and docs are hosted based on master. However, we haven't pushed the release yet. The notebook for v1.5.1 can be found here. Hope that helps!

[dinghly]

Thank you so much for your quick help!

[evancollins1]

Hi, I'm also having troubles with

from bayes_opt import acquisition

To clarify, are "utility" and "acquisition" functions referring to the same thing? Thus, would

acquisition_function = acquisition.ExpectedImprovement(xi=0.1)
be equivalent to
utility_function = UtilityFunction(kind="ei", xi=0.1)
???
(The latter one works and avoids this import issue)

Thanks

[till-m]

Hi @evancollins1,

In short, the code you describe shows how to do the exact same thing in different versions, so you can consider them conceptually the same.

To be more specific, the old way acquisition functions were implemented was somewhat inflexible and convoluted. This code has been overhauled and is what you can find on master. However, it's not yet released. As the code documentation online is based on what you can find on master (as of now, I'm working on this, see #509) you're seeing the code for the newer, yet to be released, version while probably using an older one.

I hope that clears up the confusion. Apologies for any inconveniences.