Non-contiguous word sequences are widely known to be important in modelling natural language. However they are not explicitly encoded in common text representations. In this work we propose a model for text processing using string kernels, capable of flexibly representing non-contiguous sequences. Specifically, we derive a vectorised version of the string kernel algorithm and their gradients, allowing efficient hyperparameter optimisation as part of a Gaussian Process framework. Experiments on

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... ynthetic data and text regression for emotion analysis show the promise of this technique.