coursera 以下对类a的定义，哪个是以下说法正确的是

来源：蜘蛛抓取(WebSpider) 时间：2016-09-08 02:25 标签： 以下商品发布正确的是
Coursera, A Startup That Offers Free Courses From Top Universities, Just Raised A Humongous Amount Of Cash
Coursera team giving some
Red-hot online education startup Coursera just closed a $43
million Series B round, following a $22 million Series A round
last year.
Investors included Learn Capital, GSV Capital, International
Finance Corporation, Laureate Education, and Yuri Milner.
Coursera launched in April 2012, but it has quickly grown to
become the one of the dominant players in the $4.5 trillion
learning industry. It currently works with 83 educational
institutions across 4 continents to offer about 400 free college-level
courses online.
"It's been surreal," Coursera co-founder Daphne Koller tells
Business Insider. "That's the adjective I like to use. We thought
we had a good idea, allowing people to get access to education
that has been lacking in many parts of the world. We knew we had
something significant, but I don't think we envisioned hitting 4
million members just a year out."
But that's not to say that Coursera hasn't had its fair share of
hardships. It's hard to find a revenue model where you don't
charge your users. At the same time, massive open online courses
(MOOCs) need to be able to offer some value or return to
universities.
Since launching, Coursera had added career services, verified
certificates for a fee, and courses for credit. But Koller says
that Coursera has no intention of becoming a degree-granting
business. Instead, it wants to work with universities to
them in providing accessible, high-quality degree
programs to their students.
Coursera plans to use the new funding to double its employees,
release an API, launch a collection of mobile apps, and more. But
the main thing is to expand internationally through things like
distribution partnerships, Koller says. The goal is to address
physical constraints, like capacity issues, in the developing
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International Editions:&&&&计算机概论A—Coursera—北京大学Online judge习题以及答案
计算机概论A—Coursera—北京大学Online judge习题以及答案
最新一期的Coursera 程序设计与算法课程项目（答案）合集
PKU这个的课程的核心就在于他的编程实践，全部是是现实实例的应用，绝对经典。
这里是项目的答案，是我自己在学习的过程中做的。请大家谨慎参考。这些答案都通过了课程的验证并且拿到了满分，所以虽然不敢说是最优解，但在正确性上还是有保证的。不包含答案的部分也在我的分享资源里面。
因为是原创，所以我想下载给5分是值得的，但是依然希望大家谨慎下载，毕竟只有自己亲自编程才会有收获，看别人的永远是别人的。
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1. Suppose m=4 students have taken some class, and the class had a midterm exam and a final exam. You have collected a dataset of their scores on the two exams, which is as follows:midterm
exam (midterm exam)2 final
78 You'd like to use polynomial regression to predict a student's final exam score from their midterm exam score. Concretely, suppose you want to fit a model of the form hθ(x)=θ0+θ1x1+θ2x2, where x1 is the midterm score and x2 is (midterm score)2. Further, you plan to use both feature scaling (dividing by the &max-min&, or range, of a feature) and mean normalization.What is the normalized feature x(2)2? (Hint: midterm = 89, final = 96 is training example 1.) Please round off your answer to two decimal places and enter in the text box below.
创维OLED-S9D
machine-learning的课程，答案是多少啊
完了，这门课要挂
楼主知道这题答案了吗
0.52，最大是94，最小是69，平均是81，归一化是（94-81）/(94-69)=0.52
楼上的答案都是错的吧。这里需要normalized feature x(2)2。 x(2)2-&5184根据公式xn=（xn-un）/sn。可以算出。un=6675.5sn=4075所以，x(2)2 = -0.47
在Gradient Descent in Practice I - Feature Scaling这节课的第七分钟开始，公式是=(X-μ）/s
其中μ是平均值；S是范围，就是最大值减最小值。四个数据分别为0.31 -0.37 0.53 -0.47
经过我不断的复习视频，发现了最终答案：不是-0.47而是-.47.你们看视频要细心啊！
这个我已经放弃了，题目虽然已经做出来了，但是软件根本没法安装运行，网上对这两个软件的用法和安装的资料极少，大部分都是骗人的…matlab动不动就1几个g,好不容易下完，又安装不了，还要收费，octive成功运行过一次，再也运行不了，这两个软件真让人奔溃，win10的系统，难道要让重做系统
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