Machine Learning Fundamentals: Cross Validation

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One of the fundamental concepts in machine learning is Cross Validation. It's how we decide which machine learning method would be best for our dataset. Check out the video to find out how!

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0:00 Awesome song and introduction
0:25 Motivation for using Cross Validation
1:18 Cross Validation concepts
3:41 An example using Cross Validation
4:35 Terminology (4-Fold, 10-Fold, etc)
5:20 Cross Validation for tuning parameters

Correction:
4:16 KNN should have 10 correct and 14 incorrect.

#statquest #ML #crossvalidation
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Correction:
4:16 KNN should have 10 correct and 14 incorrect.

NOTE: There has been a debate if we should call the "testing dataset" a "testing dataset" or "validation dataset". In my opinion, this depends on the size of your dataset. We'd all like to have a large dataset that we can divide into three parts: Training, Validation and Testing, but that doesn't always happen in the real world.

statquest
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It’s crazy to think where we would be if every subject had videos this clear and well made.

EigenA
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My friends find me lame when I say "I learn machine learning from a guy who sings and teaches" .
Lol they are missing out.

InfinitelyScrolling
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Dear sir/ Dear Josh,
Your StatQuest series is brilliant to say the least. The internet is these days flooded with ML tutorials that teach how to run algorithms such as logistic regression or KNN using softwares, or with the lengthy incomprehensible mathematics that explains those algorithms. Yours is one of the rare materials that explains the philosophy! Philosophy, that is the deal for humans, not just feeding numbers and generating more numbers using a machine. Thanks a lot for giving me clarity on how exactly to use cross validation, and for clearing some of the nagging doubts from my tiny, less intelligent brain .

pravin
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This guy is legend better than top university professors 😆

vivekd
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probably some of the best explained stats videos i've seen on youtube. thank you josh for constantly providing us with material that we can actually understand 0:)

aliciachen
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I hardly ever comment on YouTube videos, but I just wanted to say that this has been a TREMENDOUS help and I absolutely loved the breakdown, logic, humor, and visuals. Thank you for for making this brilliant video!

CarinaGrady
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i like how you're trying to make your videos not only educational but also entertaining

NormalHuman
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The best example so far. After watching this, my lecture's notes made sense.

TimVerdouw-itmobilesupport
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I cannot believe how you put all these complicated theories into such an explicit way!!! Wonderful channel!

gurguer
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I have a ML quiz on monday and was so worried about not grasping these concepts in time - your videos are super clear and helpful and genuinely enjoyable to watch! Thank you StatQuest with Josh Starmer <3

knads
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!!! BAM !!! Finally I found a YouTube trainer who shares knowledge the way I would like to learn... A big thank you :)

sushantkhapekar
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Josh Starmer, you are the savior of my PhD! I rarely do this, but I'm gonna buy a shirt... THANK YOU!

deanvik
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Hey Josh! This is the first time I'm watching your videos and I love the way you teach: pausing for a second before saying the next sentence. It gives time for the listener to digest what you said before! Love it!

GeoScientist
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I can't imagine how my life would be without these videos! Thanks a lot!

carolinegh
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NO words for you Mr Josh, hats off!! You make all the concepts so easy to learn in such a short time.

shamshersingh
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Dude your explanations and visuals are just perfect.
I will watch each and every video uploaded by you for sure.

rakeshranjan
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This is fantastic, I usually don't comment, but felt I had to from how well done this explanation is. Thank you for taking the time to make this

tarekal
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Thank you very much for this video, Josh! The use of visuals to explain cross validation really helps! I learnt a lot through this video about the fundamental basis behind cross validation as well as the extreme case of Leave-One-Out!

tymothylim
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Oh my sweet lord! I couldn't have ever imagined that someone can teach data science concepts interestingly and easily. I never ever comment!! But you made me do this first time in my life

gaurangikatharya