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An implementation of the HyperLogLog algorithm backed by Redis
Easy maintenence of collections of processed data in MongoDB with the Mongoid ODM
A resque plugin that scales heroku workers for batch jobs
Simon Funk's approach to collaborative filtering using the singular value decomposition, implemented in Julia.
A golang streaming histogram sketch. Fast quantiles and counts below a threshold.
A pure Ruby implementation of the SpaceSaver algorithm for estimating the top K elements in a data stream