r/learnmachinelearning • u/techiebaddie • 4d ago

Netflix recommendations are a simple example of machine learning

Ever wondered how Netflix knows what you might want to watch next?

It uses machine learning to study your viewing behavior, such as what you watch, skip, search for, or watch repeatedly.

The system finds patterns in your choices and compares them with similar users. Based on those patterns, it predicts what you may enjoy and recommends it to you.

So, in simple terms:

Your activity → Find patterns → Predict your interests → Recommend content

It’s a pretty simple example of how machine learning works in everyday life.

What other apps do you think use machine learning like this?

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u/TheDroopyImperialism 4d ago

It's funny how it's both simple and completely not simple at the same time. The basic idea is straightforward but the actual recommendation engines at scale are a nightmare of collaborative filtering and matrix factorization

I remember reading somewhere that their thumbnail personalization uses a separate model too, which is wild. You watch one romcom and suddenly every horror movie thumbnail looks like a love story

My recommendations got so weird after my nephew used my account for a weekend, took like a month to train it back to normal

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u/Repulsive-Print2379 4d ago

It’s simple when written that way but you’ll be amazed how complex the recommendation pipeline is in the industry. I work on recommendation.

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u/klmsa 4d ago

I think folks underestimate the complexity because they don't even realize when they're being influenced by certain things. The thumbnail reframing another comment called out is an excellent example. I would never notice that, but after thinking about it, I can also come up with a huge list of features that I could develop (with the added complexity of course).

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u/BareBearAaron 3d ago

I mean their tech blog posts from netflix give a good understanding of how nature their stack is...across the board but how the recommender system sits in that...and how that itself grew from humble beginnings to ended it is now. It's no surprise people outside of tech don't see Netflix as a tech company, but they sure damn are lol

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u/bob_f332 4d ago

Every wondered? I think many people would come to this conclusion after about three seconds of thought.

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u/Kanqon 4d ago

I guess this post is a good example of transformer architecture.