HyperLoglog

C++ implementation of HyperLogLog algorithm and HIP(Historic Inverse Probability) Estimator.

Usage

HyperLoglog is a headers-only library so you just need to include "hyperloglog.hpp" and "murmur3.h" to use this project. You can use normal HyperLogLog counter class(hll::HyperLogLog) and HyperLogLog counter with HIP Estimator class(hll::HyperLogLogHIP).

#include <vector>
#include <string>
#include <iostream>
#include <fstream>
#include "hyperloglog.hpp"

using namespace hll;

int main(){
    HyperLogLog hll(10);
    std::vector<string> somedata;

    //Load data to somedata

    std::vector<std::string>::iterator iter = somedata.begin();
    std::vector<std::string>::iterator iter_end = somedata.end();
    for(;iter != iter_end; ++iter){
        hll.add(iter->c_str(), iter->size());
    }

    double cardinality = hll.estimate();

    std::cout << "Cardinality:" << cardinality << std::endl;

    std::ofstream ofs("path/to/dumpfile");
    hll.dump(ofs); // It can restore by restore().

    return 0;
}

If you are using Clib, you can get source files by clib install hideo55/cpp-HyperLogLog.

Document

http://hideo55.github.com/cpp-HyperLogLog/

Author

Hideaki Ohno <hide.o.j55{at}gmail.com>

Thanks to

MurmurHash3(https://github.com/PeterScott/murmur3)

• Austin Appleby
• Peter Scott

License

(The MIT License)

Copyright (c) 2013 Hideaki Ohno <hide.o.j55{at}gmail.com>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.