Abstract
Documents are essential nowadays and present everywhere. In order to manage the vast amount of documents managed by companies, a first step consists in automatically determining the type of the document (its class). Even if automatic classification has been widely studied in the state of the art, the strongly imbalanced context and industrial constraints bring new challenges which were not studied till now: how to classify as many documents as possible with the highest precision, in an imbalanced context and with some classes missing during training?To this end, this paper proposes to study two different solutions to address these issues. The first is a multimodal neural network reinforced by an attention model and an adapted loss function that is able to classify a great variety of documents. The second is a combination method that uses a cascade of systems to offer a gradual solution for each issue. These two options provide good results as well in ideal context than in imbalanced context. This comparison outlines the limitations and the future challenges.
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