Machine learning - Decision trees

  Рет қаралды 220,392

Nando de Freitas

Nando de Freitas

Күн бұрын

Decision trees for classification.
Slides available at: www.cs.ubc.ca/~nando/540-2013/...
Course taught in 2013 at UBC by Nando de Freitas

Пікірлер: 53
@Technoslerphile
@Technoslerphile 10 жыл бұрын
Excellent! This is how a teacher should teach.
@michaelturniansky7959
@michaelturniansky7959 10 жыл бұрын
Thank you very much for this and the following session's lecture. I got my CS degree 25 years ago, and it's nice to learn about things like how to automatically decide which questions to ask first.
@nitinat3590
@nitinat3590 9 жыл бұрын
Superb lecture..Thank you very much for sharing it..I was struggling with the subject before watching this video, but now am quite comfortable and i think ill be able to manage using decision trees in my project.. Thank you again :)
@prajwalshenoy9117
@prajwalshenoy9117 5 жыл бұрын
Tremendous Explanation! This is what even courses should focus on. Instead of just giving details on the surface and start importing packages and implementing for viewer's satisfaction, it is more fruitful to start from the scratch, dig the mathematics and intuition behind and appreciate the concept.
@GatoNordico
@GatoNordico 10 жыл бұрын
Nice lecture! I came here for Decision Trees but I think I'll have a look at your other videos as well
@alhoqani2750
@alhoqani2750 9 жыл бұрын
great lecture, I have a question, is there any session for building decision tree manually?
@chandrabhatt
@chandrabhatt 9 жыл бұрын
Great lecture. crystal clear!
@kevinsluder3711
@kevinsluder3711 8 жыл бұрын
Excellent! Can subsequent levels in the tree use the same attribute for the decision at a node? For instance in the 4 color, 2 dimension example, if the root level split is based on x-sub-i, can the next level node use a rule based on x-sub-i (obviously a different split)?
@newbie8051
@newbie8051 6 ай бұрын
It amazes me that people were discussing these topics when I was studying about the water-cycle lol.
@SahibzadaIrfanUllahNaqshbandi
@SahibzadaIrfanUllahNaqshbandi 8 жыл бұрын
thank you very much..it really helped sir....and one thing I wanna tell that you have got a sweet voice.
@rahulchandra759
@rahulchandra759 7 жыл бұрын
Does anyone know where is the data file available or we just type it in from the slide Prof has
@oreoluwa24
@oreoluwa24 11 жыл бұрын
Your Lectures are very explanatory; even as an undergrad I understood them. Thanks! I was wondering if you covered multivariate decision trees in any of your lectures.
@snehotoshbanerjee1938
@snehotoshbanerjee1938 9 жыл бұрын
Best Lecture on Decision Tree.Which measure is the best - Entropy or Gini?
@0S0L0
@0S0L0 11 жыл бұрын
Hey Ore! Did you find any lecture on multivariate decision trees?
@ayushrastogi6089
@ayushrastogi6089 5 жыл бұрын
can you provide the link for the report by antonio criminisi referred by you at 52:50
@yuanyuan3056
@yuanyuan3056 7 жыл бұрын
The most clear ML course I had
@GoyalMrManish
@GoyalMrManish 8 жыл бұрын
Nice Explanation to decision tree :)
@TheHarperad
@TheHarperad 10 жыл бұрын
"To understand what a forest is we first need to understand the tree" :D
@olegstolyar6127
@olegstolyar6127 10 жыл бұрын
Thank you.
@AoAo-mt4dl
@AoAo-mt4dl 8 жыл бұрын
Thank you so much..!!!
@zxxNikoxxz
@zxxNikoxxz 8 жыл бұрын
I suppose this is how Arkinator guess who you are thinking of.
@thungp
@thungp 8 жыл бұрын
When I did the calculation for I(Patrons) at time roughly 46:36 for the number of bits of information, I get .541 (not .0541) as in his slide deck. Also, I had to find from a difference refernce that when you have a Log(0), which is normally undefined, they assume it is 0.
@ashimgupta9538
@ashimgupta9538 8 жыл бұрын
I think they don't assume log(0) to be zero but 0*log(0) to be zero.
@ayushrastogi6089
@ayushrastogi6089 5 жыл бұрын
yes it is 0*log(0), but also all log calculations are with base 2.
@sonilshrivastava1428
@sonilshrivastava1428 9 жыл бұрын
nice lecture.Thankyou very much sir..Can anybody share the referenced 'Criminisi et al, 2011' paper link?
@user-oq1pc8oc3t
@user-oq1pc8oc3t 6 жыл бұрын
Excellent
@mercurichinc
@mercurichinc 10 жыл бұрын
great shareing,Thank you.
@ZestyCrunchy
@ZestyCrunchy 11 жыл бұрын
Over 200kg? That's a whale! Awesome lecture by the way :)
@jobsamuel
@jobsamuel 9 жыл бұрын
Could you help me with the calculations at 48:23? I haven't figured it out why I(Patrons) is equal to 0,541 bits :(
@woowooNeedsFaith
@woowooNeedsFaith 9 жыл бұрын
Jobsamuel Núñez Remember to use logarithm base 2. Most calculators use natural logarithm by default.
@tobiaspahlberg1506
@tobiaspahlberg1506 8 жыл бұрын
+Jobsamuel Núñez Only the last term within the brackets contributes because 0*log2(x) = 0 and 1*log2(1) = 0. The expression simplifies to 1 - [6/12 * (-2/6*log2(2/6) - 4/6*log2(4/6))] = 0.5409....
@zwep
@zwep 8 жыл бұрын
+Tobias Pahlberg Exactly, so that means that there still is a typo in the lecture, right? Since he states 0.0541.. edit: wooohps, nevermind
@tobiaspahlberg1506
@tobiaspahlberg1506 8 жыл бұрын
zwep Yes, but I think someone in the audience pointed that out later
@ayushrastogi6089
@ayushrastogi6089 5 жыл бұрын
All log calculations for entropy are with base 2 ??
@sarahjamal86
@sarahjamal86 5 жыл бұрын
Yes!
@mohammadkamruddin6399
@mohammadkamruddin6399 8 жыл бұрын
Good lecture on decision tree. Can you please share Antonio Criminisi technical report link here. Thank you.
@saadorj
@saadorj 8 жыл бұрын
+Mohammad Kamruddin Google this: "Decision Forests for Classification, Regression, Density Estimation, Manifold Learning and Semi-Supervised Learning"
@KrishnaDN
@KrishnaDN 8 жыл бұрын
fantastic............:)
@TheHarperad
@TheHarperad 10 жыл бұрын
"If you go to the left, you are 100% red"
@deepakk1944
@deepakk1944 6 жыл бұрын
Thanks
@whiteshadow3000
@whiteshadow3000 8 жыл бұрын
22:08 square yards? awesome lectures by this teacher btw
@Rokel1993
@Rokel1993 7 жыл бұрын
this is excelent but i want to learn m5 model tree any one help me how to learn any linkgive me
@peterv.276
@peterv.276 7 жыл бұрын
ist es erlaubt, das video auf z.b. sozialen Plattformen zu teilen?
@chuckiechuckster349
@chuckiechuckster349 7 жыл бұрын
Das Video befindet sich auf KZfaq. Solange nur ein HTTP Verweis (URL) benutzt wird, ja natürlich.
@funkyweezy8071
@funkyweezy8071 8 жыл бұрын
Patron is pronounced "pay-tren" :)
@ulmermanfred4
@ulmermanfred4 6 жыл бұрын
Did I here a freudin slip? He said arround 22:55 in a greece a greedy fashion. :-). Greece is not greedy but media make us believe?
@lynnwilliam
@lynnwilliam 7 жыл бұрын
its hard to make money in AI. No restaurant or builder can afford to hire someone to do AI. Only a small fraction of AI developers get a job, sadly AI is not really used everywhere.
@ImtithalSaeed
@ImtithalSaeed 7 жыл бұрын
Not correct
@abdulelahaljeffery6234
@abdulelahaljeffery6234 7 жыл бұрын
not correct at all
@shashankupadhyay4163
@shashankupadhyay4163 7 жыл бұрын
hahahahahahahahahahahahahahahaha.....nice one....hahahah :P
@ThePunisher005
@ThePunisher005 4 жыл бұрын
So boring lecturer, I would drop the course if he is teaching
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