[Backport 2.x] Add CompressionLevel Calculation for PQ #2216
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Currently, for product quantization, we set the calculated compression level to NOT_CONFIGURED. The main issue with this is that if a user sets up a disk-based index with PQ, no re-scoring will happen by default. This change adds the calculation so that the proper re-scoring will happen. The formula is fairly straightforward => actual compression = (d * 32) / (m * code_size). Then, we round to the neareste compression level (because we only support discrete compression levels). One small issue with this is that if PQ is configured to have compression > 64x, the value will be 64x. Functionally, the only issue will be that we may not be as aggressive on oversampling for on disk mode. Signed-off-by: John Mazanec <jmazane@amazon.com> (cherry picked from commit 228aead)
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Oct 16, 2024
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Oct 16, 2024
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Backport 228aead from #2200