D-Separation

[@gergerger53]

This is great. Glad there were so many examples to really drill the concept home. Exactly what I needed.

[@lucarauchenberger628]

same!

[@sleepycomputer2067]

Don't know why most profs spend so much time no theory and almost none on examples. This really hammered the concept in for me. Excellent videos, keep it up!

[@Nazmul-4u]

Can’t thank you enough. This is the only video people need to learn about d-separation. Thanks again for your time and effort!

[@sajidsarkar9574]

Really awesome video! Numerous examples made learning much easier rather than just listening to lectures on the concepts.

[@viveksmenon123]

this is the best video on the internet that explains d-separation!! Thanks a lot Peter!

[@danielvazquezguevara3842]

by chance do you know what does it mean to be active node or inactive node?

[@viveksmenon123]

@@danielvazquezguevara3842 I think in conditional probability and Bayes nets, there are active paths, rather than nodes. An active path between 2 nodes indicates they are NOT conditionally independent of each other.

[@danielvazquezguevara3842]

@@viveksmenon123 Thank you!

[@Jannic91]

This is the best learning video I have ever watched. The many samples and repetition are what students really need in order to understand a concept. Extraordinary work! Subscribed

[@Rafacortes-w7s]

Amazing man!! The best video to really understand d-seperataion!! and only in 20 minutes!! Amazing

[@bhim443]

Its been more than 10 years now when this video was uploaded. Still I find this the best video with so many examples! great.. Thanks!

[@sagarmehla3781]

You are Awesome. You are godfather of machine learning

[@josephbolton8092]

This is the first video in which I now totally get it. Thank you so much 😊

[@PieterAbbeel]

:)

[@nicolaramoso3286]

I'd like to join with the other folks that have expressed you their gratitude for this video, finally I get it. Wish you the best.

[@lennard21M]

Thank you very much. Youre really helping me learning for my exam thursday :)

[@abdullahalmamun-ue8kc]

All the examples make it easy to understand.

[@divyamohan3177]

All hail Pieter Abbeel for explain the otherwise inexplicable 🙏🙏🙏 I really appreciate his patience to explain the details for each example; exactly what I needed!

[@hoanguyen-s3y]

Before watching your video, I found it hard to apply D-separation. But thanks to your video, everything is crystal clear now.

[@rupasreedey5838]

Such a great resource! Thank you for your time to prepare this.

[@PieterAbbeel]

Glad it was helpful!

[@GregDefender]

Bless you sir for your many step-by-step examples. I could not understand D-Separation until I saw your video!

[@giovannizizi9007]

Thank you so much for this video! I’ve passed my last exam only thanks to you!

[@zeynepkaratas9844]

This video was insanely helpful, THANK YOUUUUU!!!

[@ervincosic7656]

This is the best tutorial I've ever seen, thank you!

[@vaibhavgupta627]

This is a very nice video to learn the two rules of de-separation

[@anonymous-cg4ot]

Thank you sooo much sir. God bless you. You saved me.

[@ShashidharParagonda]

This is awesome, thanks for making this video lot of clarity gained and cleared after watching this.

[@shamsularefinsajib7778]

Amazing, I was struggling with this topic, this video made me 100% clear

[@The_savvy_Lynx]

Thank you very much for this great online lecture Professor Abbeel. Finding this video earlier would have saved me a lot of time and headache trying to decypher cryptic university scripts :D

[@PedroRibeiro-zs5go]

Thanks! This was an excellent video!!

[@fun4all-all4fun]

Why my university can't simply put the link to this video in the lecture slides and not bother the teachers who can't really teach? Thank you Prof. Abbeel!

[@shepmax555]

Thank you for this video. It really helped me to understand the topic

[@puitar927]

thank you thank you for this vedio. after watching this vedio i really get the point of d-seperation~ : )

[@sp020104]

very good one. I grasp the concept now.

[@piotrsiatkowski9519]

Thanks dude! Now I got it! They have never told me about this extended collider rule.

[@yashmishra12]

can someone help me with the intuition behind classifying the active and the inactive triples? For eg: What makes the causal link to be inactive if the middle node is observed?

[@GzimCobra]

you are a hero.. saved my exam

[@vedadcoric441]

Very nice video! keep up the work

[@PieterAbbeel]

Thank you very much!

[@havensmith6374]

Love the examples, am currently prepping for an AI midterm

[@mishabadov4435]

This was very helpful and well explained. Thanks for taking the time to make this lecture!

[@nagarajba7737]

This is such a wonderful video!!!.. Thank you so much 🙏

[@genibushati964]

Great video. Simple and on point.

[@SalmanEstyak]

Thanks for the awesome, elaborated explanation!

[@MatteoVerzeletti]

thanks Pieter! Amazing explanation. from Matteo and Lilli

[@AshutoshSahuMRM]

You saved me from failing my exam !!

[@weizhiyang6873]

Great video! Very helpful! Thank you!

[@jacobmoore8734]

You sped through example at 7:00 really quick, only checking the u->w

[@samuelfolz6062]

It only takes 1 discovered active path to make independence not guaranteed. So even if every other path they checked was inactive, that first active path invalidates any guarantee of independence

[@ekaterinagalin4962]

Awesome! Thank you! Finally understood the topic !

[@fadwaezzat6147]

This is exactly what all students need ! awesome ! great thanks :-)

[@ali57555]

thank you for great explanation.

[@MrVaunorage]

I literally understood in 5min

[@ammarhaider1530]

Comprehensive and understandable. It's Great.

[@sudaoming4559]

This video is really amazing. Thank you!

[@giannismaris13]

You saved my life

[@FirozAhammed071]

This video helps me as well as my friends. Thanks a lot :D

[@vizzyb8400]

wow so many examples thanks!

[@MrHanil1]

great video, thank you very much!

[@sagarmehla3781]

thankuuuuuuuu so much for great explanation

[@MyLife_KA]

Could you elaborate 8:54? is it really active?

[@tongpoo8985]

1:20, what do you mean by "observed"?

[@TheRaspberryPiGuy]

This video is excellent. Kudos!

[@flyingzipper]

Sad I can only give 1 like because this video was A M A Z I N G !

[@fei5002]

So helpful, thank you very much

[@satsupercool]

This is awesome!! Thanks Prof.

[@duderekluv]

Very nice to have so many examples! That said, it would perhaps have been easier to comprehend if different colors were used to distinguish paths from triples. The paths seem to get muddled together with the triples and the triples are hard to see or distinguish for some of the examples. Thanks for the fantastic lecture!

[@CLBJJ]

What's the difference between an observed and an unobserved node?

[@jivan476]

Observed node means you know the value of the random variable affected to this node. For instance, if the node is "It's raining" (True/False), and if in your situation you know that yes, it's raining, then the "It's raining" node is observed. Conversely, if you know that it's not raining, the node is also observed. If you don't know whether it's raining or not, then the node is NOT observed. Think of a node as a sensor which can take two or more different values. If you know this sensor's value, it means that you can "read" it. In other words, this sensor is "observed" by you (otherwise you couldn't know).

[@BeSharpInCSharp]

Wonderful wonderful video.

[@FranciscoGarcia-co5uq]

Just what I was looking for, thank you so much

[@boburnhamsguitar]

Thanks for the help!

[@fuqiangchen9253]

Gosh!!! This video literally saved my ass

[@khalednaami2]

Excellent. Thank you so much!

[@deepakselvaraj645]

Good explanation

[@ggsgetafaf1167]

thank for your video. But i have a question. How to know which variables can be observed or unobserved ?

[@ItzJutta]

It helped me a lot! Thanks

[@peterlankton3687]

can you please explain what do you mean when you're saying in example 2 "T is observed". i can't understand what do you mean by saying observed. thanks in advance

[@HoaPham-rg8rm]

thank you very helpful to me

[@zillwang5604]

You are legend!

[@wjli11i89]

So clear... Thank you!

[@danielvazquezguevara3842]

I wish you were teaching cs188 again!

[@Gattomorto12]

What if the nodes are adjacent?

[@ane-ct9xy]

If you can't understand after so many examples then just leave it man find something else to study

[@Gattomorto12]

@@ane-ct9xy you are probably right.

[@mollypan3032]

Very helpful! Thank you!

[@noghte]

A necessary clarification I found in a comment here: Even an inactive triple makes a path (that might have multiple triples) inactive

[@user-hr9hg2eh5c]

thanks that helps a lot

[@akshitabatra2500]

This is great! Thanks!

[@benarabbadiazamane9864]

Very helpful , Thank you

[@someshkumargupta5053]

Awesome !! Thank you so much :)

[@TTTT-wz9op]

Thank you for saving my ass, great video.

[@mehrdadheydarzadeh285]

Very clear. Thanks.

[@melihekinci7758]

Useful, thank you.

[@biIlionaire30]

thank you

[@alper2287]

Thank you!

[@ami-lx3yd]

great. tahnks

[@dart1211able]

yea i have a test 8 days from now, thank you

[@sonar_kella]

Great

[@rajbabna6400]

🙏

[@XenoX101]

Yeah this video has a number of consistency problems, and doesn't go into detail about the difference between each example. Below are some errors I found, either they are errors in what is explained (contradicts the logic being used) or they are errors in the solution (the logic is wrong). At 8:47 there is an error. Why would U _||_V | Y be "Active" when it contains the V-structure W->YYYY

[@otojankhoteli6146]

Even if there is only one active path among all possible paths between two nodes than you can say that independence is not guaranteed to be true between these nodes. At 8:47 U _||_V | Y Y is observed and it makes path U-W-V active, so you don't need to consider any other paths and say independence is not guaranteed to be true. At 10:05 there are two paths, one of them is WX, lets consider this path. There is the only triple on this path, W-V-X and it is active. It means you don't need to check the second path and say that independence is not guaranteed to be true.

[@thomaspeterson2568]

At 8:47 there is not an error. We found an active path between U & V and thus we can draw the conclusion that we can not guarantee independence. The v structure's inactivity is irrelevant since we have already found an active path between U & V. At 6:58 the quotation you have written doesn't make any sense and is not said in the video? At 6:05 your quotation is completly wrong. He says that an inactive TRIPLE implies and inactive PATH. Which is what he has been saying in nearly every example. If there is an inactive triple and an active triple in a path then the path is inactive for your clarification. At 10:05 he says that it is the ONLY TRIPLE IN THIS PATH not that it is the only triple. He has already explained why he ignores the bottom path. It is because he found that the first path is active so he doesn't have to check the other paths. Because, if at least one path is active then we can not guarantee independence. The logic with the triples is clearly explained in the beginning of the video .Maybe you didn't pay attention in the beginning? My recommendation to you would be to try to rewatch the beginning and try to remember the triples that are inactive and active as well as trying to understand the difference between a triple and a path. Best /T

[@AtOnePoint978]

🤩

[@osamazahid8922]

Such a confusing video. Making it unnecessarily difficult to understand basic concepts.