How to manually change parameters in service API?

Parameters can be generated by

parameters, trial_index = ax_client.get_next_trial()

I encountered a case where I want to manually change the parameters. What is the procedure for me to do that? Thanks!

[danielrjiang]

@deng-cy Thanks for the explanation! Indeed, it is an early stopping problem and I believe you are interested in model-based early stopping, where the GP is jointly over (x, t). We are actually working on making this functionality available in Ax soon and it is currently being tested.

Note that we have an early stopping tutorial here that supports a basic, non-model-based setup: https://github.com/facebook/Ax/blob/main/tutorials/early_stopping/early_stopping.ipynb

For your exact problem, instead of abandoning, perhaps what you could do is to “artificially” complete the trial, using ax_client.complete_trial with data from your epoch-based model at t=100 (and if your model gives uncertainty estimates, then you could send those to Ax as the sem). After that, you would be able to generate a new trial while making use of the predicted performance at t=100. Finally, if you want to modify the parameters, you can use @danielcohenlive’s suggestion above.

The tricky part here is that after the original trial finishes running, you’ll want to go back and update the data using ax_client.udpate_trial_data.

[danielcohenlive]

I’m going to close this if there are no further questions, but feel free to reopen it or create a new issue