NEAL CONAN, HOST:

Stanford computer science professor Andrew Ng put his machine learning class online last year, and to his surprise,
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If you’ve taken classes online, what works, and what are the problems? Give us a call: 800 989 8255. And you can also join the conversation at our
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ANDREW NG: Hi. Thanks for having me.

CONAN: How soon
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NG: You know, it was I think within two days of posting something online,
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CONAN: Machine learning. This is obviously a very advanced science course. Are there that many I guess there are that many people pretty interested in it.

NG: Yeah. Machine learning is a technology that’s used widely throughout Silicon Valley. It powers all of our computers today. But it is a somewhat advanced, esoteric topic. I think this is a sign of how much hunger there is out in the world for high quality courses from universities like Stanford. And I think we’re seeing the world change with, you know, top universities like Stanford, Princeton, Michigan, Penn putting free online courses for anyone
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CONAN: How did Stanford react to offering this course for free, when they charge paying students quite a bit for it?

NG: You know, when you talk to top universities, ultimately, I think the mission of top universities is to educate people and, frankly, not to make money. And I think when you talk to a professor of a top
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CONAN: Similarly, I guess, parents might have a question about why are you offering these courses for free when their kids are paying, what, $40,000 a year to go to Stanford.

NG: Oh, that’s a great
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CONAN: And one of the things that interested me about this the way this works is that everybody can ask questions, and then there’s sort of this group discussion, a little like Yelp, as to which questions rise to the top.

NG: Yeah. So in a class of 100,000 students, you know, what happens when you have 100,000 students 100,000 voices all talking the same time? Just yesterday, the Intro to Sociology class from just launched on the Coursera platform, and already, sort of, what less than 48 hours later, there are already tens of thousands of students participating in the discussion. And part of the technology design for the website was to allow tens of thousands of students to speak simultaneously, but for answers and questions to
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CONAN: And then there’s the question of quizzes and tests and that sort of thing. How do you grade all those?

NG: You know, initially we started off with auto grading, and it turns out that, you know, when
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So in the past few months, we’ve developed very complex auto grading things, where you not just not just multiple choice, but things like math derivation checking and also peer assessments, where students grade each other’s work and give each other feedback. So recently, we had a
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CONAN: That’s interesting because that opens the way toward discussions of how you can possibly one thing to teach mathematics courses or machine learning courses, another to go to poetry or creative writing.

NG: Yeah. In fact, when we were visiting when my co founder Daphne and I were visiting UPenn and spoke with the poetry instructor there and told him, you know, well, would you like to teach
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One of my favorites also I think next week, there’s a class on health policy that’s about
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NG:
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CONAN: We’re speaking with Professor Andrew Ng, computer science professor at Stanford University. And now he is the founder, with his colleague Daphne Koller, of Coursera, which offers a broad range of interactive online courses. Let’s
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KAYLA: Actually, a lot of my classes don’t even have lectures. They just consist of buying books from the school and then taking the class entirely online. And so the discussions are actually just a forum on the class webpage.
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