
Title:

Description:

This class is divided into three subclasses

>> Mmhm.

>> Three parts. They are supervised learning

>> Yeah.

>> Unsupervised learning, and reinforcement learning. So

what do you think supervised learning is?

>> So I think of supervised learning as being the problem of taking labeled

data sets Gleaning information from it so that you can label new data sets.

>> That's fair.

I call that function approximation.

>> Mm.

>> So, here's an example of supervised learning. I'm

going to give you an input and an output, and

I'm going to give them to you as pairs, and

I want you to guess what the function is.

>> Sure

>> Okay? Okay. 1:1.

>> Uhhuh. Two four.

>> Wait. Hang on. Is one input and one the output?

>> Yes.

>> And two the input and four the output?

>> Correct.

>> Alright, I'm on, I think I'm on to you.

>> Three.

>> Uhhuh.

>> Nine.

>> okay.

>> Four. Sixteen.

>> Nice.

>> Five. Twenty

five. Six. Thirty six. Seven. Forty nine.

>> Nice. This is a very hip data set.

>> It is. What's a [UNKNOWN]?

>> It's hip to be squared.

>> Exactly. Maybe. Oh.

>> So if you believe that's true, then tell

me if the input is ten, what's the output?

>> 100.

>> And that's right, if it turns out, in fact, that the function is X

squared. But the truth is we have no

idea where's the function's X squared, not really.

>> I have a pretty good idea.

>> You do?

>> Well, just.

>> Where did that idea come from?

>> It

comes from having spoken with you over a

long period of time. And plus you know, math.

>> And plus math, well, I'm going to

>> You can't say I'm wrong.

>> You're wrong.

>> uhh, you said I was wrong.

>> No, you've talked to me for a long time and plus math, I

agree with that, but I'm going to claim that you're making a leap of faith.

>> Mmmm

>> Despite being a scientist, by deciding that

the input is 10 and the output is 100.

>> Sure, I would agree

with that.

>> And what's that leap of faith?

>> Well, I mean, from what you told me, it's still consistent with

lots of other mappings from input to output like ten gets mapped to 11.

>> Right, or everything's x squared except ten.

>> Sure.

>> Or everything's x, x squared up to ten.

>> Right, that would be mean.

>> That would be mean.

>> But it's not logically impossible. What'll be the medium.

>> [SOUND]

>> Thank you very much. I was saving that one up.