Remove unnecessary dataset copy on TraveledSpeedsClassifier
Remove unnecessary dataset copy on TraveledSpeedsClassifier

A copy of the whole dataset was being made on __classify_dataset(),
but the same opeartion is performed on its only caller, predict().
This change should save some memory and running time for this
classifier. Not sure if it solves the memory/kill problem, though.

Signed-off-by: Luiz Carlos Cavalcanti <f75264472019413209f44db736949a4411e3cddd@gmail.com>

datasciencebr/serenata-de-amor,marcusrehm/serenata-de-amor,datasciencebr/rosie,marcusrehm/serenata-de-amor,datasciencebr/serenata-de-amor,marcusrehm/serenata-de-amor,marcusrehm/serenata-de-amor