"嗨，我是多多"。认识备忘录背后的人工智能

Daily practice is essential for language learning, so Duolingo helps learners stay on track by sending daily practice reminders. In fact, Duo's persistence is so well known that it's even become a popular internet meme. And let's be honest, most of us have probably swiped away one of these notifications...and probably felt a bit guilty in the process.

日常练习对语言学习至关重要，因此Duolingo通过发送日常练习提醒来帮助学习者保持进度。事实上，Duo的坚持是如此众所周知，以至于它甚至成为一个流行的互联网备忘录。老实说，我们中的大多数人可能都刷掉了其中的一个通知......而且在这个过程中可能会感到有点内疚。

But, have you ever wondered how Duo decides what message to send? Well, last year Duolingo’s Machine Learning Engineers built a really neat AI system to find the perfect reminder to send each learner each day! We recently published this novel algorithm in a paper and short presentation at the Knowledge Discovery and Data Mining (KDD) Conference 2020. In this post we’ll take a peek at the AI behind these notorious notifications.

但是，你有没有想过，Duo如何决定发送什么信息？好吧，去年Duolingo的机器学习工程师建立了一个非常整洁的人工智能系统，以找到每天给每个学习者发送的完美提醒我们最近在2020年知识发现和数据挖掘（KDD）会议上发表了一篇论文和简短的演讲，介绍了这一新颖的算法。在这篇文章中，我们将窥探一下这些臭名昭著的通知背后的人工智能。

In a nutshell

概括地说

We use a variety of pre-written notifications for our practice reminders, and we personalize them based upon a variety of factors such as the language you're studying and your current streak. We periodically update these to keep things fresh and engaging. Since one of Duolingo’s operating principles is “Test everything,” we always run experiments to test new notifications on a small number of learners before using them across the board. This way, only the best templates get permanently added to the pool.

我们使用各种预先写好的通知进行练习提醒，并根据各种因素对其进行个性化处理，如你正在学习的语言和你目前的成绩。我们定期更新这些通知，以保持新鲜感和吸引力。由于Duolingo的运营原则之一是 "测试一切"，我们总是先在少数学习者身上进行实验，测试新的通知，然后再全面使用这些通知。这样一来，只有最好的模板才会被永久地添加到池中。

However, when sending practice reminders, it used to be that notifications were selected from the pool at random. We wondered if we could help more learners stay motivated by making the algorithm smarter. What if AI could find the best notification to send to each user ea...