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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

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
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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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