Different Errors when initializing my loop with Service API and Developer API about ax

[bernardbeckerman]

Hi there, taking a look!

[bernardbeckerman]

Is there any particular reason that the developer API is required for your use-case, or can you work around this issue by using the service API instead?

Additionally, if I do not put the data argument (and naively expect that the experiment containing the data will be enough) i get the following error:
DataRequiredError: StandardizeY transform requires non-empty data.

This is because your the BO model has no prior data off of which to train. Usually, GenerationStrategies begin with a Sobol (random initialization) step, followed by a BO step. The former seeds the search space with data off of which the latter trains. When you provide prior data, it's possible to skip the Sobol step as you saw above, but when no prior data is provided, a Sobol step is required. Does that answer your questions?

[Jgmedina95]

Understood the latter part! thanks for explaining it
But I do need to use the Developer API, as to generate new samples I'm using the FixedParameters like:

generator_run = model_bridge_with_GPEI.gen(n=N,
                                      fixed_features=ObservationFeatures({
                                                             'Parameter1':12345,
                                                             'Parameter2':6789
                                                                             }
                                                                     ) )

Which is not available in the Service API, there's a Feature Request about this somewhere.

[mgarrard]

Hi @Jgmedina95 -- let me find the associated feature request and mark another interest for you. Also re: your comment about not sure why runner is needed -- your guess is right! Essentially a runner defines how to deploy the experiment, meaning how to evaluate the trials and then stores that data somewhere. It also keeps track of where that data is stored so that it can be easily fetched in the future. This page has a bit of info on runners.

Bernie's call-out re: the SOBOL initialization step being missing causing the error seems accurate to me -- does this help answer your question, or would you like further support? Will agree definitely a bit ambiguous, so will also make a note of that.