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Summary: This enables adding DerivedParameters to an experiment with existing trials. These DerivedParameters do not have a backfill_value as RangeParameters do, but rather, their values are compute in FillMissingParameters based on the values of the other parameters.

Differential Revision: D92753331

@meta-cla meta-cla bot added the CLA Signed Do not delete this pull request or issue due to inactivity. label Feb 11, 2026
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meta-codesync bot commented Feb 11, 2026

@sdaulton has exported this pull request. If you are a Meta employee, you can view the originating Diff in D92753331.

facebook#4888)

Summary:

This enables adding `DerivedParameter`s to an experiment with existing trials. These `DerivedParameter`s do not have a `backfill_value` as `RangeParameter`s do, but rather, their values are compute in `FillMissingParameters` based on the values of the other parameters.

Differential Revision: D92753331
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Codecov Report

❌ Patch coverage is 94.02985% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.76%. Comparing base (98b0e66) to head (3dc496c).

Files with missing lines Patch % Lines
ax/core/tests/test_experiment.py 80.95% 4 Missing ⚠️
Additional details and impacted files
@@            Coverage Diff             @@
##             main    #4888      +/-   ##
==========================================
- Coverage   96.76%   96.76%   -0.01%     
==========================================
  Files         593      593              
  Lines       62035    62065      +30     
==========================================
+ Hits        60030    60055      +25     
- Misses       2005     2010       +5     

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