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Multi-modal action recognition methods can be generally classified into two categories: (1) fusing multi-modal features with simple concatenation or fusing the classification scores of individual modalities without considering the interaction among the multi-modalities; (2) using one of the modalities as privileged information in training to boost the recognition on the other modalities in inference. The former approach usually is not able to deal with the cases where one of the modalities is missing. In the latter, the trained classifier does not work on the privileged modality. To address these shortcomings, this paper presents a novel end-to-end trainable deep fusion network (DFN) that is able to improve the performance not only in the cases where all modalities are available and also in the cases where there is a missing modality. The DFN is simple yet effective with the capability of retrieving an estimation of one modality by using another modality through a Multilayer Perceptron

Multilayer perceptronDeep learningUman action recognitionMulti modal fusion