目录概FrequentDirectionsFrequentDirectionsoverSliddingWindows代码GhashamiM.,LibertyE.,PhillipsJ.M.andWoodruffD.P.Frequentdirections:Simpleanddeterministicmatrixsketching.2015.YinH.,WenD.,LiJ.,WeiZ.,ZhangX.,HuangZ.andL