Add SFM Sketch for private cardinality estimation#65
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NikhilCollooru merged 1 commit intoprestodb:masterfrom Oct 21, 2023
Merged
Add SFM Sketch for private cardinality estimation#65NikhilCollooru merged 1 commit intoprestodb:masterfrom
NikhilCollooru merged 1 commit intoprestodb:masterfrom
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The SFM sketch is a mergeable, differentially private sketch for distinct counting, introduced in https://arxiv.org/abs/2302.02056. Conceptually, it is similar to HyperLogLog, except that noise may be intentionally added to the sketch to preserve the privacy of its entries. After noise has been added, the sketch becomes private and immutable. However, private sketches may be merged with other private sketches to obtain a sketch of their union. This sketch may be used to obtain private estimates of distinct counts with low memory footprint in a distributed setting. Some minor refactoring of the PrivateLpcaSketch is included in this commit. (The PrivateLpcaSketch can be used to convert an existing HyperLogLog to a different, less flexible privacy- preserving sketch. While similar in spirit, the use cases for these two sketches are subtly different.)
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The SFM sketch is a mergeable, differentially private sketch for distinct counting, introduced in
https://arxiv.org/abs/2302.02056. Conceptually, it is similar to HyperLogLog, except that noise may be intentionally added to the sketch to preserve the privacy of its entries. After noise has been added, the sketch becomes private and immutable. However, private sketches may be merged with other private sketches to obtain a sketch of their union.
This sketch may be used to obtain private estimates of distinct counts with low memory footprint in a distributed setting.
Some minor refactoring of the PrivateLpcaSketch is included in this commit. (The PrivateLpcaSketch can be used to convert an existing HyperLogLog to a different, less flexible privacy- preserving sketch. While similar in spirit, the use cases for these two sketches are subtly different.)