Cast as float before KMeans
Cast as float before KMeans

Temporary hot fix for a bug in PySpark (it should automatically upcast
to float before running KMeans, but is currently failing to do so,
leading to a SerDe error)

kcompher/thunder,broxtronix/thunder,zhwa/thunder,poolio/thunder,kunallillaney/thunder,mikarubi/thunder,broxtronix/thunder,kunallillaney/thunder,mikarubi/thunder,kcompher/thunder,oliverhuangchao/thunder,pearsonlab/thunder,j-friedrich/thunder,pearsonlab/thunder,j-friedrich/thunder,oliverhuangchao/thunder,poolio/thunder,zhwa/thunder,thunder-project/thunder,jwittenbach/thunder