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Update HNSW Brute Force Threshold While Searching with Bitset #829
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Signed-off-by: Patrick Weizhi Xu <weizhi.xu@zilliz.com>
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issue: #792
Based on the experiment results below, when the filter rate is higher than ~93%, brute force outperforms graph search at around ~1M vector scale from GIST and GLOVE datasets.
Thanks @cydrain for running the experiments.