[SPARK-58550][ML] Delay GaussianMixture aggregation allocations - #57750
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zhengruifeng wants to merge 1 commit into
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[SPARK-58550][ML] Delay GaussianMixture aggregation allocations#57750zhengruifeng wants to merge 1 commit into
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marked this pull request as draft
August 4, 2026 09:00
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What changes were proposed in this pull request?
This PR delays allocation of
ExpectationSuminGaussianMixtureuntil an aggregation partition receives its first point. Empty partitions and intermediate tree branches usenullas the aggregation identity.Why are the changes needed?
The previous
treeAggregatezero value eagerly allocated the mixture weights, means, and one dense covariance matrix per cluster. That can be substantial for large models and is also serialized to every partition, even empty ones.Does this PR introduce any user-facing change?
No.
How was this patch tested?
Not run (not requested). Added coverage using an RDD with an empty partition. Static checks:
git diff --check, ASCII scan, and changed-line length scan.Was this patch authored or co-authored using generative AI tooling?
Generated-by: Codex (GPT-5)