added support of threads in map_on_cluster, added score_to_proba and take_last
added support of threads in map_on_cluster, added score_to_proba and take_last

zhmz90/hep_ml,iamfullofspam/hep_ml,nickcdryan/hep_ml,zhmz90/hep_ml,chrinide/hep_ml,anaderi/hep_ml,nickcdryan/hep_ml,iamfullofspam/hep_ml,anaderi/hep_ml