narray squared distance + better proxy
narray squared distance + better proxy

ondra-m/ruby-spark,ondra-m/ruby-spark,tomz/ruby-spark,tomz/ruby-spark,ondra-m/ruby-spark,ondra-m/ruby-spark,ondra-m/ruby-spark,tomz/ruby-spark,tomz/ruby-spark,tomz/ruby-spark,tomz/ruby-spark,ondra-m/ruby-spark