Machine Learning Week_1 Introduction 9-11

目录

• 1.9 Who are Mentors?
  • unfamiliar words
• 1.10 Get to Know Your Classmates
  • unfamiliar words
• 1.11 Frequently Asked Questions
  • General Questions
  • unfamiliar words

1.9 Who are Mentors?

Mentor Program Overview:

Community Mentors are successful, dedicated Coursera learners who volunteer to assist with support and discussion forum moderation in courses that they have already completed. They have been recruited by Coursera to encourage newer learners, answer questions, set an example by posting thoughtful and timely content, and report platform bugs and inappropriate content to Coursera.

As you use the discussion areas, please be aware that the ideas expressed by participants in this course, including the Mentors, do not represent the views of Stanford University. The mentors are not employed by Stanford University and they have not been vetted by Stanford University as experts on course content or course facilitation.

unfamiliar words

1. mentor 英 [ˈmentɔː(r)] n. 导师;顾问 vt. 做…的良师;指导

   • exp1: N an experienced person who advises and helps sb with less experience over a period of time
     
     One mentor, one person can change a life forever.
     
     一位辅导员，一个人能够改变一个人生。
   • exp2: V To mentor someone means to give them help and advice over a period of time,
     
     You may need to target a new candidate to mentor.
     
     你可能需要指导新徒弟。

2. dedicated [ˈdedɪkeɪtɪd] adj. 投入的 专注的
   
   exp: ADJ You use dedicated to describe someone who enjoys a particular activity very much and spends a lot of time doing it.
   
   She is dedicated to her job.
   
   她对工作专心致志。

3. moderation [ˌmɒdəˈreɪʃn] n. 适度;适中;合理;评分审核制

   • exp1: N the quality of being reasonable and not being extreme
     
     Alcohol should only ever be taken in moderation (= in small quantities) .
     
     酒只可适量饮用
   • exp2: (In Education) the process of making sure that the same standards are used by different people in marking exams, etc.

4. participant [pɑːˈtɪsɪpənt] n. 参与者;参加者
   
   He has been an active participant in the discussion.
   
   他一直积极参与这次讨论。

5. vet [vet] n. 兽医;兽医诊所 v. 审查
   
   exp: V to find out about a person's past life and career in order to decide if they are suitable for a particular job 审查
   
   All candidates are carefully vetted for security reasons.
   
   由于安全的缘故，所有的求职申请人都要经过严格的审查。

6. facilitation [fəˈsɪlɪˈteɪʃən] n. 促进;容易;便利;
   
   The effect of memory facilitation was proved by several models.
   
   采取多种模型证实其具有改善小鼠记忆的作用。

1.10 Get to Know Your Classmates

Overview

Working well with your classmates is an important part of this online course. Thus, at the beginning of this course, we would like you to take time to break the ice and get to know each other. You may already know some of your classmates or have just met them. Establishing personal interaction with other students will make your online learning experience much more enjoyable and engaging. As such, we encourage you to participate in this activity, though it is optional.

Meet and Greet

Tell everyone your story! Optionally, you are asked to provide a brief introduction to your classmates. If you don't know what to include in your introduction, you may want to provide information that you'd like to share with your classmates by answering some of the following questions.

Suggested Topics

Where are you from? If you wish to include this information in your post, you can also include it below the body of your post in the "tags" area. For example, include your state (if living within the United States) or country in the tags section.

Career and education? What is your educational background? What do you currently do? Are you currently pursuing a change in careers and/or more education?

Hopes? Why did you decide to take this course? What are your expectations of this course? What problem are you trying to solve? What do you hope to put into place in your life the day this course is over?

Other info? Share with us any other information that might help others in the class find you when searching the forums. What common interests might you share with your classmates? We have tens of thousands of students enrolled in this course – put something in your post that will help others who are like you to find you.

Go to the Meet and Greet forum and click the New Thread button to begin a new thread. Use your name and a brief summary as the subject of your post. For example, Robert Smith: Exploring Career Options. Read some your classmates' postings. Pick at least 2 classmates' postings that are most interesting to you and add your friendly comments.

Updating Your Profile

Optionally, please consider updating your profile, which can also be accessed by clicking the Profile link in the menu that appears when you click on your name at the top-right corner of this screen. When people find you in the forums, they can click on your name to view your complete profile and get to know you more.

Time

This activity will take approximately 1 hour to complete.

These guidelines for interacting with fellow classmates via the forums were originally compiled by The University of Illinois.

unfamiliar words

1. participate [pɑːˈtɪsɪpeɪt] vi. 参加;参与
   
   She didn't participate in the discussion.
   
   她没有参加讨论。

2. interest [ˈɪntrəst] n. 兴趣;关注;
   
   Do your parents take an interest in your friends?
   
   你的父母有兴趣了解你的朋友吗？

3. profile [ˈprəʊfaɪl] n. 轮廓; 简介; 概述；
   
   exp: N a description of sb/sth that gives useful information
   
   a job/employee profile
   
   工作 / 雇员简介

1.11 Frequently Asked Questions

The following Machine Learning Mentors volunteered time to compile this list of Frequently Asked Questions: Colin Beckingham, Kevin Burnham, Maxim Haytovich, Tom Mosher, Richard Gayle, Simon Crase, Michael Reardon and Paul Mielke.

Be sure to thank them when you see them in the discussion forums!

General Questions

Q: Is the grader server down? A: First step is to check here.

Q: The audio in the videos is quite bad sometimes, muffled or low volume. Please fix it. A: You can mitigate the audio issues by turning down the bass and up the treble if you have those controls, or using a headset, which naturally emphasizes the higher frequencies. Also you may want to switch on the English closed captioning. It is unlikely to be fixed in the near term because most students do not have serious problems and therefore it is low on the priority list.

Q: What does it mean when I see “Math Processing Error?” A: The page is attempting to use MathJax to render math symbols. Sometimes the content delivery network can be sluggish or you have caught the web page Ajax javascript code in an incomplete state. Normally just refreshing the page to make it load fully fixes the problem

Q: How can I download lectures? A: On Demand videos cannot be downloaded.

Q: Is there a prerequisite for this course? A: Students are expected to have the following background:

Knowledge of basic computer science principles and skills, at a level sufficient to write a reasonably non-trivial computer program.

Familiarity with the basic probability theory.

Familiarity with the basic linear algebra.

Q: Why do we have to use Matlab or Octave? Why not Clojure, Julia, Python, R or [Insert favourite language here]? A: As Prof. Ng explained in the 1st video of the Octave tutorial, he has tried teaching Machine Learning in a variety of languages, and found that students come up to speed faster with Matlab/Octave. Therefore the course was designed using Octave/Matlab, and the automatic submission grader uses those program interfaces. Octave and Matlab are optimized for rapid vectorized calculations, which is very useful in Machine Learning. R is a nice tool, but:

1. It is a bit too high level. This course shows how to actually implement the algorithms of machine learning, while R already has them implemented. Since the focus of this course is to show you what happens in ML algorithms under the hood, you need to use Octave

2. This course offers some starter code in Octave/Matlab, which will really save you tons of time solving the tasks.

Q: Has anyone figured out the how to solve this problem? Here is my code [Insert code]. A: This is a violation of the Coursera Honor Code. Find the Honor Code here.

Q: I've submitted correct answers for [insert problem].However I would like to compare my implementation with other who did correctly. A: This is a violation of the Coursera Honor Code. Find the Honor Code here.

Q: This is my email: [insert email]. Can we get the answer for the quiz? A: This is a violation of the Coursera Honor Code. Find the Honor Code here.

Q: Do I receive a certificate once I complete this course? A: Course Certificate is available in this course. Click here to learn about how Course Certificate works and how to purchase.

Q: Why do all the answers in a multiple correct question say correct response when you submit the answer to an in-video question? A: Coursera's software is designed to suggest the correctness of each state of the check box. Therefore, an answer having a correct answer tag below it means that the state of that check box is correct.

Q: What is the correct technique of entering a numeric answer to a text box question ? A: Coursera's software for numeric answers only supports '.' as the decimal delimiter (not ',') and require that fractions be simplified to decimals. For answers with many decimal digits, please use a 2 digits after decimal point rounding method when entering solutions if not mentioned in the question.

Q: What is the correct technique of entering a 1 element matrix ? A: They should be entered as just the element without brackets.

Q: What does a A being a 3 element vector or a 3 dimensional vector mean? A: If not described a vector as mentioned in the questions is

A = \(
\begin{bmatrix}
element1\\
element1\\
element1
\end{bmatrix}
\)

Q: I think I found an error in a video. What should I do? A: First, check the errata section under resources menu. If you are unsure if it is an error, create a new thread in the discussion forum describing the error.

Q: My quiz grade displayed is wrong or I have a verification issue or I cannot retake a quiz. What should I do? A: Contact Help Center. These queries can only be resolved by learner support and it is best if they are contacted directly.

unfamiliar words

1. compile [kəmˈpaɪl] vt.编写(书、列表、报告等);编纂;编译
   
   exp: V to produce a book, list, report, etc. by bringing together different items, articles, songs, etc.
   
   We are trying to compile a list of suitable people for the job.
   
   我们在努力编制一份适合做这项工作的人员名单。

2. muffled [ˈmʌfld] adj. 沉闷的;压抑的;模糊不清的
   
   exp: ADJ not heard clearly because sth is in the way that stops the sound from travelling easily
   
   muffled voices from the next room
   
   从隔壁房间里传来的沉闷声音

3. mitigate [ˈmɪtɪɡeɪt] vt. 减轻;缓和
   
   action to mitigate poverty
   
   减轻贫穷的行动

4. treble [ˈtrebl] n. 高音;(音乐或音响系统的)高音部;

5. headset [ˈhedset] n.(尤指带麦克风的)头戴式受话器，耳机

6. caption [ˈkæpʃn] n. 字幕

7. render [ˈrendə(r)] vt. 提供;使成为;

   • exp: V to cause sb/sth to be in a particular state or condition
     
     to render sth harmless/useless/ineffective
     
     使某事物无害 / 无用 / 无效
   • exp2: V to give sb sth, especially in return for sth or because it is expected 给予；提供；回报
     
     to render a service to sb
     
     给某人提供服务

8. sluggish [ˈslʌɡɪʃ] adj.行动迟缓的;缓慢的;
   
   sluggish traffic
   
   缓缓移动的车流

9. prerequisite [ˌpriːˈrekwəzɪt]
   
   n. 先决条件;前提;必备条件 adj. 必须先具备的，必要的;先决条件的
   
   A degree is an essential prerequisite for employment at this level.
   
   学位是做这级工作必备的先决条件。

10. sufficient [səˈfɪʃnt] adj. 足够的;充足的
    
    Allow sufficient time to get there.
    
    留出充足的时间好赶过去。

11. trivial [ˈtrɪviəl] adj. 不重要的;琐碎的;
    
    exp: ADJ not important or serious; not worth considering
    
    a trivial detail
    
    细枝末节

12. decimal [ˈdesɪml] adj. 十进制的;

13. delimiter 定界符
    
    Invalid delimiter { 0} found in the connection option value.
    
    在连接选项值中发现无效分隔符{0}。

14. fraction [ˈfrækʃən] n. 小部分;少量;一点儿;分数;小数
    
    The students had a grasp of decimals, percentages and fractions.
    
    学生们掌握了小数、百分数和分数。

15. verification [ˌvɛrɪfɪˈkeɪʃən] n.检验，检查，审核；验收；查证，
    
    Verification is the important part of simulation scenario system.
    
    校验是仿真想定系统组成中的重要部分。