Talk Abstract: Modelling memory with busuu’s Vocab Trainer.
Ever wondered how language learning apps like busuu decide which words are burned into your memory and which need to be reviewed? In this talk we describe the spaced repetition model behind busuu’s Vocab Trainer which predicts the rate at which your memory of a word decays. We then use model predictions on real users to answer questions like, “Which words do users find the most difficult?”, “Which exercises in the app are the best measures for ‘knowing’ a word?” and “How do learning patterns change from country to country?”.
Bio: With a background spanning elections forecasting, data science consultancy and trying in vain to figure out what dark matter is, Tom is the stats and ML guy at busuu. His current ML projects include dynamic discounting, lifetime value modelling and algorithm design for the vocab trainer.