Simplify task value remapping API (#3146)#3163
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hvarfner wants to merge 2 commits intometa-pytorch:mainfrom
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Simplify task value remapping API (#3146)#3163hvarfner wants to merge 2 commits intometa-pytorch:mainfrom
hvarfner wants to merge 2 commits intometa-pytorch:mainfrom
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added 2 commits
February 5, 2026 10:51
Summary: Permits an MTGP to predict on an unobserved task, addressing these issues: meta-pytorch#2360 meta-pytorch#3085 To do this, we assume that the unobserved task is maximally correlated with the target tasks (equally with each, by averaging the elements). Exact heuristic on correlation is definitely up for discussion, but this seems like a decent default assumption. Will come in handy for TL initialization. Differential Revision: D90769576
Summary: X-link: facebook/Ax#4860 Simplifies the get_task_value_remapping() API from 4 parameters to 2, addressing confusion reported in meta-pytorch#3085. The observed_task_values parameter is removed because the parent diff (D90769576) now makes MultiTaskGP track observed/unobserved tasks internally via _observed_task_indices and _unobserved_task_indices. The default_task_value parameter is removed because the previous behavior—silently mapping unknown tasks to an arbitrary fallback—was confusing and error-prone; instead, unrecognized tasks now map to NaN, providing an explicit error sentinel with a clear warning message. Differential Revision: D90998243
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #3163 +/- ##
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Coverage 99.97% 99.97%
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Files 219 219
Lines 21221 21250 +29
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+ Hits 21216 21245 +29
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Summary:
X-link: facebook/Ax#4860
Simplifies the get_task_value_remapping() API from 4 parameters to 2, addressing confusion reported in #3085.
The observed_task_values parameter is removed because the parent diff (D90769576) now makes MultiTaskGP track observed/unobserved tasks internally via _observed_task_indices and _unobserved_task_indices. The default_task_value parameter is removed because the previous behavior—silently mapping unknown tasks to an arbitrary fallback—was confusing and error-prone; instead, unrecognized tasks now map to NaN, providing an explicit error sentinel with a clear warning message.
Differential Revision: D90998243