译文推荐系统（未实现）设想：仿照yeeyan.org做一个译文推荐系统我们做了什么译文推荐系统-用例图“UC:发布译文”的UCD1.点击发布翻译2.系统返回原文登记页面8.系统返回译文发布预览页面（对其他用户不可见）10.系统返回译文发布页面（其他用户可见）替代流程2a：用户在未登录状态，点击发布按钮，系统返回登录界面替代流程5a.（用户未填写原文信息中必选项目）系统提示用户填写必选项目替代流程6a：（用户点击推荐原文按钮）系统返回原文页面1.用户点击推荐文章的条目“UC:浏览文章条目”的UCD“UC:查看文章内容”的UCD“UC:评价文章”的UCD数据模型图2.编译mahouttaste在1MillionMovieLens数据集运行结果ProblemsWeMetAndSolutions2.SetEnvironmentVariables:ThereareseveralplaceswhereyoucansetyourenvironmentvariablesinUbuntu.①/etc/environment②/etc/profile③/etc/bash.bashrcWhenaUbuntuStarts,systemloads/etc/evironment,andthen/etc/profile.Ifyoumodifiedthetwofilesnotproperly,youcan'tloginUbuntuwithgraphicinterface.Butdonotafraid,pressCtrl+Alt+F6,andyoucanstillloginthroughcommandline.Andthenrestorethetwofileswithvi,resetyoursystem.Amoresafewayistoaddyourenvironmentvariablesin/etc/bash.bashrc.Thisfilewon'tbeloadedwhenUbuntustarts.Actually,itwillnotbeloadeduntilyouopenyourTerminal.3.mvn-DskipTestscleaninstallTestsofmahoutexamplescostsalotoftime,weuse"-DskipTests"toskiptests.Ifwefailtobuilditatfirsttimeandyou'retryingtorebuildit,wefound"mvncleaninstall"helpful.'causeitisusedtodeletehistorytargetfiles.4.Makesureyourcomputerhaveenoughmemoryavailable.Mahoutgenerates"outofmemory"error,input"exportJAVA_OPTS=-Xmx1024MB".1Gavailablememoryisneeded.Mahoutismemoryintensive.Someonesaidrunninga10Mdatasetontaste-webneed500Mofmemory.5.OtherproblemsMahoutthrowsusawholebunchofOtherproblems.Someofthemcostusseveralnightstosettle,someothersremain.ProblemsremainedToruntaste-webexample,IaddedanewmemorytomycomputerLastMonday,anditworked,butjustforthatnight.WhenItriedtorebuilditonTuesday,itfailed.Old"outofmemory"exceptioncameagain.Ispent7hourstryingtofixit,set"Javaheapspace"to"-Xmx2048MB",butitrefusedtoworkanyhow.Weguessed,ifwechoosedasmallerdataset,theproblemmightbesolved.Sowedivided"1Mmovielens"into"100k,200k,300k,500k(lens)",putthemintotherightdirectory,andtried"mvnjetty:run-war".AndwegotnewExceptionWorkToBeDone