Video: How Reinforcement Learning Enables Personalized Viewing Experiences
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Watch the complete video of this presentations, AI104A: Personalization Using Real-Time End-User Feedback, in the Streaming Media Conference Video Portal.
Read the complete transcript of this clip:
Rafah Hosn: Here's another solution to consider. This is a new paradigm in machine learning called reinforcement learning. And here we use real, end-user feedback to train our model. So, how does that work? Let's take our news example again.
We have a user. They come to their favorite news website. There's an online learner on the background. Whenever a user comes in, a user has context. That means they have some features set, the geolocation they are in, or the type of device they're using. We call this the context X. Then, inside that red box, there is a policy, a model, that's choosing the best list of new stories for this user based on that context X. We call this an action.
Now the key in reinforcement learning is that we don't stop there. The learner proposes an action, and waits for the user feedback. That's why it's called reinforcement learning, because every time the user clicks, that's a positive reinforcement feedback for the online learner. It's exactly like teaching a puppy a trick. Every time the puppy does something, you give him a treat. That's a positive feedback. Every time the puppy does something wrong, you say, "Bad puppy." It doesn't learn from that. It's exactly the same principle. That's kind of the paradigm that we use for personalization.
Now, the key in reinforcement learning is a concept called exploration. For the gentleman that asked about the cats and dogs, at least in the type of reinforcement learning we do, suppose that you love space. So in most, 80% of the time we're going to choose for you space articles because that what we learn that you like. But add some random .2%, .1%, 2%, and we're going to choose a different article. So, we'll show you cats and at some configurable number, we say, "You know what? We're going to explore this space and see if this gentleman actually likes a little bit of dogs." So, we'll show the dog. Then we'll observe your reaction to the dog. If you give us a positive feedback, we say, "Oh, well. Okay. Maybe it's not just cats. Maybe he does like dogs a little bit."
This exploration is very, very powerful. This is not complete random exploration. It's exploration over the set of your feasible actions. So in the context of news, your editorial comes with 12 lists of stories, trending stories that should be shown on the page. So, 80% of the time we will show the news that we think you like, and 20% we will randomize over this list of 12 articles and propose a different type of article and see if the user reacts positively to it. That's our positive reinforcement feedback for this algorithm.
It turns out that exploration is so powerful because it allows you to now label your data set automatically. You don't need to go and spend money labeling your data set because every positive reinforcement is a label. And any time you're exploring, you're actually increasing your data set. So, this gives you a very rich data set that you can learn from.
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