A Trainable Spaced Repetition Model for Language Learning

Figure 1: Duolingo screenshots for an English-speaking student learning French (iPhone app, 2016). (a) A course skill tree: golden skills have four bars and are at full strength, while other skills have fewer bars and are due for practice. (b) A skill screen detail (for the Gerund skill), showing which words are predicted to need practice. (c,d ... ................
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