Techniques for Approximate Counting

In many scenarios,  we can live with approximations in counting.

There are a few techniques in particular which are increasingly being used in online scenarios. Example, services like RedShift, Redis and Spark have in built support for these data structures.

  1. Hyper Log Log.
  2. Count Min Sketch.
  3. Bloom Filters.
  4. Locality Sensitive Hashing.



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