I-EA4
6-线性分类器设计-第六章

k 此法可收敛于W值。W满足: XT(XW-b)=0
令 ρk =
ρ1
其中 ρ 1 为任意常数
因此下降算法不论XTX是否奇异,总能产生一个解。 若训练样本无限的重复出现,则简化为 W1任意 Wk+1=Wk+ρk(bk-WkTXk) Xk k+1
取 ρK
=
ρ1
k
ρk随迭代次数k而减少,以保证算法收敛于满意的W值
其中N/N1有N1个,N/N2有N2个
四 韦—霍氏法(LMS法)迭代法
上节得到MSE法的W解为:W=X+b
伪逆 X + =
(
XT X
)
−1
X
T
计算量很大
在计算X+时, 1. 要求XTX矩阵为非奇异 2 2. 由于计算量太大而引入比较大误差 所以要用迭代法来求 求J(W)的梯度 ▽J(W) =2XT(XW-b) 代入迭代公式 W1任意设定 Wk+1 = Wk-ρkXT(XWk-b)
H wk+1 ρk x
权值修正过程
例题:有两类样本 ω1=(x1,x2)={(1,0,1),(0,1,1)} ω2=(x3,x4)={(1,1,0),(0,1,0)} 解:先求四个样本的增值模式 x1=(1,0,1,1) x2=(0,1,1,1) x3=(1,1,0,1) x4=(0,1,0,1) 假设初始权向量 w1=(1,1,1,1) ρk=1 第一次迭代: w1Tx1=(1,1,1,1) (1,0,1,1)T=3>0 所以不修正 w1Tx2=(1,1,1,1) (0,1,1,1)T=3>0 所以不修正 w1Tx3=(1,1,1,1) (1,1,0,1)T=3>0 所以修正w1 w2=w1-x3=(0,0,1,0) w2Tx4=(0,0,1,0)T (0,1,0,1) =0 所以修正w2 w3=w2-x4=(0,-1,1,-1) 第一次迭代后,权向量w3=(0,-1,1,-1),再进行第2,3,…次迭代 如下表
高中英语书面表达指导--感谢信

感激答谢信I 感谢信作为书信的一种形式, 态度客气, 字里行间充满感激之情, 通常也是开篇点出写信的目的, 可使用“I am writing to...”句型作为书信开头,II 积累该类写作常用词组搭配:1. appreciate one’s doing _________________2. be grateful/thankful to sb. for sth _________________3.express my thanks/gratitude for ____________________4. help sb. with sth ____________________5. thanks to ____________________6. help sb (to) do ____________________7. make great progress in _________________ 8. It is nice/thoughtful of you to do sth _________________9. get familiar with ____________________ 10. improve my oral English ____________________ 11. get to know about ____________________12. but for …. I would have done ________________13. win the first prize in English speech competition ____________________14. with the help of my teacher ____________________III 作文结构第一段:表达感谢之情并说明原因I am writing to express/show my gratitude for your help with my English competition on Sept.16.__________________________________________________________I am writing to thank you for inviting me to your wedding party.__________________________________________________________I am grateful to you for your encouragement and I am writing to tell you that I have got promotion in my job. __________________________________________________________I’m writing to show my great gratitude for your help during my stay in England.__________________________________________________________I’m writing to thank you for returning to me my wallet and mobile phone__________________________________________________________第二段:细述并赞赏对方给与的帮助;常用句式It was nice/kind/thoughtful (adj. 考虑周到的) of you to do .__________________________________________________________Thank you very much for your kind hospitality (n. 好客, 热情招待) and the honor you showed me during my visit in America.__________________________________________________________ But for/Without your help, I wouldn’t have (won the prize) (虚拟语气)__________________________________________________________Thanks to your help, I have learnt how to cook western food.__________________________________________________________Sweet memories of your helping me going over lessons kept flashing back in my minds.__________________________________________________________But for your help, I would not have succeeded as a reporter.__________________________________________________________My achievement is owed to your help_______________________________________________________ __第三段:再次阐述谢意并表达回报愿望。
高铁用EA4T车轴钢热变形行为及变形抗力模型的试验研究

Ex p e r i me n t a l S t u d y o n Ho t De f o r ma t i o n Be h a v i o r a n d Ma t h Mo d e l s f o r
De f o r ma t i o n Re s i s an t c e o f EA4 T Ax l e S t e e l or f Hi g h S p e e d Ra i l
验机进行单 道次压缩变形 , 变形完成 后进行 水淬 冷却
至室 温 。测 试 温 度 为 9 5 0~1 1 5 0 c C, 应 变 速 率 为 0 . 1~ 2 0 S ~; 形 变量 6 0 %, 共进 行 3 0个 试 验 测试 ,
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FMEA失效模式与效应分析

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六年级下册英语教案-Unit1 You and me 教案+知识点精讲+习题练习 沪教牛津版

Unit1 You and me1.To learn some new words and phrases in this unit.2.To know how to use these words and phrases.3.Attract students’ interest to English learning.1.Key words, sounds,There be patterns.Do you know about your height and weight?______________________________________________________________Can you use correct sentences to ask your classmates about their height and weight? ______________________________________________________________一.必记重点单词二. 常考短语三.重点句型1.--- How much do you weigh, George? 乔治,你有多重?--- I weigh 40 kilograms. 我体重40 千克。
【即学即练】( ) --- ____ do you weigh,Tim?--- I weigh 40 kilograms.A. How heavyB. How tallC. How much解析:根据答语是体重多重,可知问句用 How much 。
答案:C2.---How tall are you? 你有多高?--- I’m 152 centimetres tall.我身高152 厘米。
【即学即练】( )--- ____ are you?--- I’m 165 centimeters tall.A. How muchB. How tallC. How heavy解析:我们要根据答语选特殊疑问词组,答语回答的是身高多高,可知问句用How tall 提问多高。
英语音标拼音学习

ui,ey
字母组合: e,i,
ee,ea,ie, ei,ey,eo
ʊ 勿 短音
乌一半
u: 乌 长音
乌
ə 饿 短音
饿一半
ɜ: 鹅 长音
饿
[kʊk] cook
[ku:l] cool
['sɪstə] sister
[bɜ:d] bird
[fʊt] foot
[fu:d] food
we
she
e辅e
bete hete these
ea,重读音节
eat
tea
ee,重读音节
bee free
E,e
ey,重读音节
key
-
ie,重读音节
chief field
[ɛ,e] 重读闭音节 egg
leg
yes
ea
bread dead head
[ɪ] 非重读闭音节 exam begin deny
[ɛə] ear
buzz 字母组合: s,ss,z,zz
ts 清悄悄话 刺 dz 浊出声说 滋
无尾音 舌尖贴 上齿龈
carts cards
boats
字母组合: ts
birds
字母组合: ds
t 清 特 悄悄话 无尾音
舌尖贴
d 浊 得 出声说 上牙龈
tear dear
goat mad
字母组合: t,tt,ed,th
what 字母组合: w,wh
you
字母组合: y
自然拼音
开音节:元音结尾的单词。 闭音节:辅音结尾的单词。 元辅e:此处e不发音,为哑巴e。
[eɪ] 开音节 a
baby daily
Unit 3 Section B(3a-Self Check)导学案 人教版九年级英语全册

I can't imagine why he did that thing.
二、语序:(1)由于宾语从句要求陈述句语序,所以特殊疑问句在从句中要变成陈述语序。
如:How much does this coat cost? → I want to know how much this coat costs.
A.Thanks to B.Thanks for C.Thank toD.Thank for
( )2.The annoying alarm clock________ in the early morning every day.
A.wake me upB.wakes me up
C.wake up meD.wakes up me
迷人的________ 不贵的__________不拥挤的_______ 便利的_______
在….拐角_______礼貌的________ 不礼貌的_________礼貌地_________
正确的________ 直接的__________地下的_______ 课程_______
路过__________ 左拐_________ 在三楼___________
D.how should I get to the Pacific Cinema
( )6.--- Do you knowCindy is waiting for?
--- Her cousin. They're going to the park.
A. whatB. whichC. whomD. whose
九年级英语上册导学案
课题
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4 信号连接 .................................................................................................. 8
4.1 脉冲信号和方向信号输出 .............................................................................................. 8 4.2 编码器输入信号 EA、EB 和 EZ .................................................................................. 8 4.3 原点开关信号 .................................................................................................................. 9 4.4 正反向限位信号 PEL/MEL............................................................................................. 9 4.5 通用数字输入信号 DI..................................................................................................... 9 4.6 通用数字输出信号 DO ................................................................................................. 10
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– Puritans:
» took religion as the most important thing » lived for glorifying God » dreamed of living under a perfect order » worked with courage » hoped to build an Eden of Garden on earth » faced the worst of life with optimism
John Winthrop
– Self-taught scholar – First governor of Massachusetts – Believed that he had a ―calling‖ from God to lead there – Not a believer of Democracy
The land tion route
America Rediscovered
– Christopher Columbus sailed west from Europe in 1492 » landed on one of the Bahama Islands » named the people Indians. and – Amerigo Vespucci » America was named after him
– Glory: For the glory of the king!
English Colonial Period
– Causes for English Colonizing in America
»Fall of Spanish Armada in 1588 opened North Atlantic to English expansion »Rise of merchant class to provide business leadership and wealth for colonial investment. »Surplus population in cities as farmers were pushed off the lands »Persecution of Puritans, Catholics, and Quakers led to conflict with religious and political authorities
– People from: England, the Netherlands, France, Germany and others. – Puritans, Quakers, Anglicans, Catholics, and Jews. – Governed with Proprietary Charters – Religious Freedom and Tolerance – Freedom of the Press – Strong Courts
Thanksgiving Day
Pilgrims v. Puritans
– Those who wanted to total break from the Church of England and set up their own church were Pilgrims (Separatists). – Those who wanted to ―purify the church‖ to its original state were Puritans. – Among later comers, more puritans but fewer Separatists.
Motivations of the immigrants
– Most immigrants left their homelands
» escape political oppression, To » seek the freedom to practice To their religion, » get economic opportunities To denied them at home.
Southern Colonies
– South Carolina – North Carolina – Virginia – Maryland – Georgia
– Atlantic and Gulf Coastal Plains. – Long growing season and fertile land.
Middle Colonies
– New Jersey – Pennsylvania – Delaware – New York
– Lower Eastern Woodlands – Medium growing season and cold winters. – Many lakes and rivers for transportation. – Farmed Wheat, Oat, Barley and Rye. – Made homespun products. – Traded very little.
– Rhode Island – Connecticut – New Hampshire – Massachusetts
New England
– Northern Eastern Woodlands
– Very Short Growing Season
– Long Cold Winters
– Large Forests – On the Atlantic Ocean – Subsistence Farming – Timber, Ship Building, Fishing, Rum and other Manufactured Trade Goods
– Warm for most of the year
»Spain: South America for silver and gold. »England: North America for natural resources; Africa for manual labor »France: also North America for natural resources
– Provided model for further economic investment in America – 2. First representative selfgovernment (House of Burgesses--1619) – 3. Demand for slaves (1st slaves sold by Dutch to settlers in 1619)
Mayflower
– None chose to leave in 1621 when the Mayflower sailed back – Got help from Indians in planting crops and in hunting and fishing, – Fall of 1621—First ―Thanksgiving.‖ – Great Puritan Migration of 1629-1640 brought many new settlers, thus merging into Massachusetts Bay Colony
William Penn
– A wealthy Quaker – Received a large tract of land
– Established a colony 1681 – Later became known as Pennsylvania
Philadelphia Independence Hall
Jamestown
John Smith
Jamestown Fort
Jamestown Housing
Tobacco
Jamestown Settlement
Virginia House of Burgesses
The Second English Colony
– Plymouth Colony (New England) »Pilgrims sailed on the ship Mayflower across the sea »Arrived in Massachusetts in 1620 »Mayflower Compact—first document of self-government in America. »After difficult first winter (44 out of 102 survived), Pilgrims survived under the leadership of Governor William Bradford.
Indentured Servants
The Three Regions
– The 13 colonies can be divided into three regions:
» New England » Middle Colonies » Southern Colonies
New England
Amerigo Vespucci (1454-1512)
North America, 1750
European Exploration: Motivations
– God: Spread the good word! – Gold: They wanted money of their own!
– Puritans and Pilgrims who believed in working hard and following strict rules. – Merchants, Manufacturers, and Lawyers. – New England Government