With acareful study, we find amore general problem which is rooted in low-frequency words in the text corpus.

Existing works of coping with covariate shift mainly focused on the "

Thestandard supervised learning paradigm workseffectivelywhentraining data shares the same distribution as the upcoming testing samples.

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Many events occur in the world. Some event types are stochastically excited or inhibited--in the sense of having their probabilities elevated or decreased--by patterns in the sequence of previous events. Discovering such patterns can help us predict which type of event will happen next and when. We model streams of discrete events in continuous time, by constructing a neurally self-modulating multivariate point process in which the intensities of multiple event types evolve according to a novel continuous-time LSTM . This generative model allows past events to influence the future in complex and realistic ways, by conditioning future event intensities on the hidden state of a recurrent neural network that has consumed the stream of past events. Our model has desirable qualitative properties. It achieves competitive likelihood and predictive accuracy on real and synthetic datasets, including under missing-data conditions.