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...Journal of machine learning research submitted revised published metric learn algorithms in python william de vazelhes wdevazelhes gmail com paris center huawei technologies boulogne billancourt france cj carey perimosocordiae google llc th ave new york ny usa yuan tang terrytangyuan ant group almanor sunnyvale ca nathalie vauquier inria fr aur elien bellet aurelien magnet team lille nord europe villeneuve d ascq editor balazs kegl abstract is an open source package implementing supervised and weakly distance as part scikit contrib it provides a unied interface compatible with which allows to easily perform cross validation model selection pipelining other estimators thoroughly tested available on pypi under the mit license keywords introduction many approaches require measure between data points traditionally practitioners would choose standard euclidean city block cosine etc using priori knowledge domain however often dicult design metrics that are well suited particular task interes...