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This paper presents an efficient model to predict a student's answercorrectness given his past learning activities. Basically, I use bothtransformer encoder and RNN to deal with time series input. The novel point ofthe model is that it only uses the last input as query in transformer encoder,instead of all sequence, which makes QK matrix multiplication in transformerEncoder to have O(L) time complexity, instead of O(L^2). It allows the model toinput longer sequence. Using this model I achieved the 1st place in the 'Riiid!Answer Correctness Prediction' competition hosted on kaggle.

Last Query Transformer RNN for knowledge tracing