台湾大学机器学习基石手写笔记
大家好,我是Mac Jiang,今天和搭建分享的是台湾大学机器学习基石(Machine Learning Foundations)的个人笔记。个人觉得这门课是一门非常好的机器学习入门课程,值得初学者学习!这份笔记是本人一笔一划手写,扫描后上传了,也算是一个月的心血,希望我的工作能够给大家带来一些学习上的帮助。Week 1: The leaming ProblemDateP1. What is Machine Learning?m:画过观架( observation)款悍技能〔)cb→圆>skdem0过数(d枝能(s)t→DML→5m Prove:增进某种表现 Performance measurePer fornoMeasureML: an alternative rute to butt aomplacoded systems- When human connot prinn the system manually (navigating on Mars)-When human nnot define the solution esaily(speech/vgual recgnition)-When needing raBid deasions that huniang cannot do (high freguency trading?When neeling to be user-orrented in a massive sale(Consumer-targetd mopketig)dataim proved①有在其些日术Pattern RcRRMLerformance机购在完不知邮们度珠meusure的隐藏规剧料灿2.Appliaation of Machine learniO food: data Twitter data Wordsspill tell food Poisoning Cike lines of resturant properlye clothig. data: scale fiqures +client surveysskill: give good fashion recommendation to Clients3 Hosing, data, characteristic of buidings and their energy loadkill:predict energy lad of other buiding closely9 Trans potation: data: Some traffic sign images and meaningsShill= recognize troffic Sions acuratelyO Education: data. Studerts, records onizes ona math tutoring systemskilL: Predict whether a stdert can give a Comet answer to anther question⑥ ntertainment:da: ho w many users have hated some movies象社解料系子荐你统stiu Predict how a user Would rate an uNatPagc3. Com Ponent of Machine lemn输入:x∈x出:y∈Y睛数(9Mrtm)tf:y→丫〔想下的)抛规律台道数据如 raining examples:D=,,()…(xmhyes分sk:9x→y〔学到的程制的孤)辆一M→9Algur+nH( hy Pothesis Set)色色妇的成坏的Pt8,9∈H,从种中最的即9Leaming model= A and He hypothesis set4.Machine learning and other FiMachine (earring, B do值到约练于B数于的设3CMLatMn鸡:eg如 to find property that15e西不哦啥CDM)若立越西的为9R西事无大大区刷若栖与9关,PM可帮助MLArdt9g让电座有很瞰明的表视(下开)CA工)机学展现A工铝能的方法statistics(计利用瓷料爆到推龙,从数学角出发纯计晨钯机罟孑的方法第2讲: Learn to Answera人阳0 n Hypothesis set(假设集)Xxx)「y=(,许答 Wii threshold飞岁=+,讲卷Wx∠thr
- 2020-06-19下载
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Matlab优化工具在通用风力机翼型型线设计中的应用
本文重点介绍了,Matlab优化工具在通用风力机翼型型线设计中的应用情况。并进行了设计实例分析第28卷第4期机械设计Vol 28 No 42011年4月JOURNAL OF MACHINE DESIGNApr.2011种有效的动压气体径向轴承承载力数值解法张海军,沈剑英,杨琴(嘉兴学院机电工程学院,浙江嘉兴314001)摘要:考虑动压气体径向轴承中气膜压力变化小的特点,对润滑 Reynolds方程的非线性项进行适当近似,得到线性Reymolds方程。利用有限差分法求解该近似 Reynolds方程,得到动压气体径向轴承的压力分布,分析气体径向轴承性能,计算得出轴承承栽力的大小,并与文献中的实验数据进行比较。与直接数值解相比,该数值解计算结果与实验数据吻合较好。关键词:动压气体径向轴承; Reynolds方程;非线性;有服差分法;中图分类号:TH17.2文獻标识码:A文章编号:1001-2354(2011)04-002-04气体轴承利用润滑膜中的气体压力来实现承载作为两类3:解析数值解和直接数值解。解析数值解方用的。由于所用润滑介质一般为空气,因此气体轴承法,即对非线性 Reynolds方程进行一些近似,求得近似具有摩擦损耗少、速度高、精度高和污染少等特点1。解析解表达式,然后用数值方法求解;直接数值解方法20世纪60~70年代国内外进行气体轴承研究较多,则是对非线性 Reynolds方程直接进行数值近似求解。近年来随着MEMS微动力涡轮研究的兴起,气体轴承 Raimondi利用有限差分法分析了有限长动压气体径的研究又开始受到重视2]。向轴承性能。Peks和 Breuer5采用伪谱法来求解Reynolds方程是分析动压气体径向轴承性能的基 Reynolds方程。戚社苗。等通过数学变换,将动压气本方程,由于气体的可压缩性使 Reynolds方程呈现非体润滑 Reynolds方程变换成标准的椭圆型偏微分方程线性,一般难以求得解析解,因此采用数值方法研究气形式,以 Matlab pde( partial differential equation)工具体径向轴承性能是一种有效途径。数值解方法可以分箱为求解器,实现 Reynolds方程的计算。如·.·············分··心···分·····如·心如·鲁心·心心普·心···心·必·心·心·心·心·心·心鲁●[2 Fuglsang P, Bak C, Gaunaa M, et al. Design and verificaApplication Matlab optimization tool in general profilestion of the Risg- Bl airfoil family for wind turbine[ J]. Jour- design for wind turbine airfoilsnal of Solar Energy Engineering, 2004, 126: 1002-1010WANG Xu-dong WANG Li-cun[3] Timmer W A, Van Rooi A. Summary of the delft universiEngineering Research Centre for Waste Oil Recovery Tech-ty wind turbine dedicated airfoils[ J]. Jourmal of Solar En- nology and equipment, Ministry of Education, Chongqing Technolergy Engineering, 2003, 125: 488-496ogy and Business University, Chongqing 400067, China[4] Bjork A. Coordinates and calculations for the FFA-Wl-xxxAbstract: Based on the optimization algorithm and optimizaFFA-W2-xox and FFA-w3-xxx series of airfoils for horizon- tion tool in Matlab, the optimization mathematical model for the In-tal axis wind turbines[ R ] FFA TN, Stockholm, tegrated expression of general profile for wind turbine airfoils wasSweden, 1990established. By taking the optimization design of the lift and drag[5]苏金明,张莲花,刘波等.MA们AB工具箱应用M]. ratio of wind turbine airfoils as the objective function, taking the co-北京:电子工业出版社,2004.eficients of the general profile control equation as design variables6]钱翼稷.空气动力学[M].北京:北京航空航天大学出 and taking the thickness and curve shape of the wind turbines air-版社,2005foils as the constraints, one airfoil with relative thickness of 18%is[7]王旭东,陈进, Wenzhong Shen,等.风力机叶片翼型型线 designed and the its performances are analyzed. The result has集成设计理论研究[门].中国机械工程,2009,20(2): broadened the design way and method for wind turbine airfoils211-213Key words Matlab; wind turbine airfoil; general profile; op-[8] Drela M. XFOIL 6.8 User Primer[M]. MIT Aero astro, timization algorithmFig 3 Tab0 Ref 8Jixie Sheji"0298咖收稿日期:2010-01-11;修订日期:2010-10-25甚金项目:嘉兴市科技计划资助项目(2008AY2021)作者简介:张海军(1976—),男,山东鱼台人,讲师,硕士,研究方向:气体轴承-转子动力学等。Mat1ab优化工具在通用风力机翼型型线设计中的应用旧WANFANG DATA文献链接作者:王旭东,王立存, WANG Xu-dong, WANG LI-cun作者单位:重庆工商大学,废油资源化技术与装备教育部工程研究中心,重庆,400067刊名:机械设计 ISTIC PKU英文刊名:JOURNAL OF MACHINE DESIGN年,卷(期)本文链接http://d.g.wanfangdata.comcn/periodiCaljxsj201104005.aspx
- 2020-12-09下载
- 积分:1