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[DiskBBQ] Make centroid oversampling depend on the visit ratio #133945
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We have currently a fixed oversampling of 20% of the total centroid. This works well for low / medium number of centroids but starts being quite slow when the number of centroids increases. Now that we introduced a visit ratio we can make it dependent on that an oversample the number of centroids we expect to visit by a constant.
Local experiment shows no lost of recall and a nice speed up when the number of centroids is high.