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MachineLearning-Lecture15

Instructor (Andrew Ng) :All right. Good morning. Welcome back. So a couple quick announcements before I go into today's technical material. So unfortunately, a long time ago, I agreed to give a few [inaudible] in Japan, so I won't be here on Wednesday. So the next lecture will be, I shall be taping it ahead of time. In particular, instead of a lecture on Wednesday, I'll be giving Wednesday's lecture tomorrow instead at 1:30 p.m. in the Skeeling 191 auditorium.

So those here, you come to class at the usual time, the taped lecture will be taped ahead of time, but then shown in this room at this time. But if any of you are free tomorrow at 1:30 p.m., I should be grateful if you can come to that, alternative of the taping of the lecture, which will be at 1:30 p.m. Skeeling 191.

I'll also send an email out with the details, so you don't need to write it down. But if any of you can make it to that, it'll make it much easier and more fun for me to teach to a live audience rather than to teach on tape to an empty room. So I'll send an email about that. We'll do this for this Wednesday's lecture as well as for the lecture on the Wednesday after the Thanksgiving break.

In case you don't want to deal with it, and this is the only time you make it, you can just show up at the usual time, and the lecture will be presented here in this room as well, and online, of course. Let's see. For the same reason, my next two office hours, which are usually on Fridays will also be moved to the following Monday because I'll be traveling. So if you're planning to come to my office hours either this week or the week after Thanksgiving, just take a look at the course website for the revised time.

In case you want to meet with me, but can't make the new time on the course website, you can also send me an email. We'll try to set up a time outside that. Okay?

But again, if you're free at 1:30 p.m. tomorrow, either those watching this online now or people in this classroom, I would be grateful if you can come to Skeeling 191. If there are any of you that couldn't ever make this regular class time and so always watch it online, you can come see a live lecture, for once, those of you watching online.

Are there any administrative questions about that? Okay? Let's go into today's technical material.

Welcome back. What I want to do today is continue a discussion of principal components analysis, or PCA. In particular, there's one more application that I didn't get to in the last lecture on [inaudible] indexing, LSI. Then I want to spend just a little time talking about how to implement PCA, especially for very large problems. In particular, I'll spend just a little bit of time talking about singular value decomposition, or the SVD implementation of principal component analysis.

So the second half of today's lecture, I want to talk about the different algorithm called independent component analysis, which is, in some ways, related to PCA, but in many other ways, it also manages to accomplish very different things than PCA. So with this lecture, this will actually wrap up our discussion on unsupervised learning. The next lecture, we'll start to talk about reinforcement learning algorithms.

Questions & Answers

do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Mueller Reply
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Source:  OpenStax, Machine learning. OpenStax CNX. Oct 14, 2013 Download for free at http://cnx.org/content/col11500/1.4
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