Forward-merge release/26.02 into main #1730
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This PR brings new params to ivf_pq: an option for the user to choose the layout of the ivf lists. The lists can be flat (no interleaving) or interleaved (current default). Flat codes allows building the index in a CPU-compatible format. [UPDATE as of 12/19/2025]: After #1278 is merged, we can unify IVF-PQ and PQ API codepaths. [UPDATE 01/08/2026]: This PR can be merged before #1278. The flat code-writing can potentially be reverted once #1278 is merged (so we can later use the PQ preprocessing API directly). However that will come naturally as a part if a broader unification of IVF-PQ and PQ codepaths. [Benchmarks 01/15/2026]: ## IVF-PQ Layout Benchmark Results **Dataset**: 1,000,000 vectors × 128 dimensions | **pq_dim**: 32 pq_bits | Code Size | Direct FLAT Build (ms) | INTERLEAVED Build (ms) | Convert INTERLEAVED to FLAT with Codepacker (ms) | Total time for INTERLEAVED build + Conversion to FLAT with Codepacker (unpack) (ms) | Overhead | |:-------:|:---------:|:---------------:|:----------------------:|:-------------------:|:----------------------:|:--------:| | 8 | 32 bytes | 372.46 | 385.86 | 985.28 | 1371.13 | 3.68× | | 6 | 24 bytes | 298.83 | 300.99 | 961.82 | 1262.82 | 4.23× | | 5 | 20 bytes | 283.25 | 281.95 | 795.43 | 1077.38 | 3.80× | | 4 | 16 bytes | 270.63 | 271.01 | 489.73 | 760.75 | 2.81× | Authors: - Tarang Jain (https://github.com/tarang-jain) Approvers: - Corey J. Nolet (https://github.com/cjnolet) - Robert Maynard (https://github.com/robertmaynard) URL: #1607
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Forward-merge triggered by push to release/26.02 that creates a PR to keep main up-to-date. If this PR is unable to be immediately merged due to conflicts, it will remain open for the team to manually merge. See forward-merger docs for more info.