Читать книгу The YouTube Formula - Derral Eves - Страница 29

Did you know that YouTube has more than one algorithm? The AI uses multiple systems, and each has its own objective and goal. The surface features viewers see are:

 Browse Features: Homepage and Subscription

 Suggested

 Trending

 Notification

 Search

Each of these features runs separate algorithms trying to be optimized for a higher hit rate, and they all feed into the YouTube AI. They have separate hit rates to determine what actually works for users in each particular system. Hit rate means how often viewers are able to find what they actually want to watch. Have you ever heard of a fisherman getting a “hit?” It's when a fish takes the bait. Imagine that you are the fisherman who has tossed his video into the water. Potential viewers are the fish swimming by your “bait.” Maybe 10 fish take a look at the bait and swim on by because it's not the brand of bait that they like. But along comes a fish who says, “That looks good,” and he bites. Say you toss this line 10 times, and while 100 fish swam past, 10 took the bait. There's your hit rate. This hit rate is so important to each system in the AI. The algorithms are very sensitive to user behavior and the metadata on each traffic source so that they know how to change to increase the hit rate.

Additionally, YouTube is constantly running experiments—several thousand a year—and they implement about 1 in 10 changes as they go, so this translates to hundreds of changes being implemented annually. These changes help the system get smarter, and smarter means better at feeding viewers what they will watch.