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22 novembro 2018

How Pinterest Uses AI to Capture Our Imaginations

by : Wired THE TERM “ARTIFICIAL intelligence” conjures up images of both the distant future (humanoid robots, self-driving cars) and the hard work it will take to get there. But the technology is already pervasive, and in places you might not realize. Take Pinterest, the visual search platform where people discover and save ideas. The company

by : Wired

THE TERM “ARTIFICIAL intelligence” conjures up images of both the distant future (humanoid robots, self-driving cars) and the hard work it will take to get there. But the technology is already pervasive, and in places you might not realize.

Take Pinterest, the visual search platform where people discover and save ideas. The company invests heavily in artificial intelligence, often in ways that might not be obvious to a casual user.

“We’re constantly experimenting with applications that people can imagine using today,” says Vijay Narayanan, the company’s Head of Discovery and Content. “There are AI projects focused on things like self-driving cars, but there’s also the everyday, accessible AI that helps people live better lives now.”

In order to develop the “everyday, accessible AI,” Pinterest follows a simple but often-ignored rule: Before anything else, define your problem. “Don’t develop technology just for the sake of developing technology,” says Narayanan. “Instead, develop technology with a purpose, and one that supports your core mission.”

Features like surfacing recipe suggestions based on diet or suggesting home decor for a user’s specific taste are available because of deep learning (a subset of AI and machine learning that uses neural networks to mimic the brain to more quickly analyze data and train computer models). By understanding the intention behind a simple search, Pinterest’s deep learning models deliver highly personalized results.

And Internet users appreciate personalization—80 percent of them are more likely to make a purchase if the experience is personalized. By using AI to analyze mountains of data, Pinterest tailors search results for each of its hundreds of millions of users. That’s a big reason why Pinterest considers itself “at its core, a data and AI company,” according to Vanja Josifovski, its Chief Technology Officer.

Discovering a User’s Intention
In September, Pinterest reached 250 million monthly active users. Pinterest cofounder Evan Sharp recently said that while users spend time in other popular apps, they invest time in Pinterest. People use what they discover on Pinterest. Whether for a costume party or on a road trip, they make use of what they find.

For this to be true, Pinterest needs to solve the “discovery problem.” When a user enters a search term, nearly 75 percent of which are three words or fewer, what is he or she actually looking for? There may not be a clear answer to start, but the deep learning-powered search experience helps draft one.

Say the user searches “BBQ,” and selects an image that depicts an intimate backyard scene. The app will recommend other images and searches. Maybe they include table settings or lawn games. Strung together, they represent a path of discovery, starting with A, the vague desire to grill something, and ending with Z, a fastidiously planned weekend barbeque with friends.

One way Pinterest makes recommendations relevant is through a neural network called PinSage, developed in part using the TensorFlow and PyTorch deep-learning frameworks on Amazon Web Services (AWS). The deep-learning model places each image, according to theme, within one giant “graph” of other images.

Three billion images, or “nodes,” form the graph; 18 billion lines connect them. The result is a detailed context for each image, which allows Pinterest to recommend thematically similar images for users, such as charcoal briquettes and grilled meats. Rather than a linear list of results, the user receives a comprehensive guide to what he or she could plan for the weekend.

Pinterest’s deep-learning personalization efforts use more than just users’ search terms to improve. They also learn from what users capture with their phones’ cameras.

Pinterest Lens camera search allows users to search by taking a photo of an object offline and receive results for online recommendations. An apple will return results for related recipes for dishes, such as pie or cider. A photo of a pair of running shoes will result in related shoes, and even athletic clothing to style with it, available for purchase.

 

Continue reading on : Wired.com