  End-to-end architectures have been recently proposed for spoken language
understanding (SLU) and semantic parsing. Based on a large amount of data,
those models learn jointly acoustic and linguistic-sequential features. Such
architectures give very good results in the context of domain, intent and slot
detection, their application in a more complex semantic chunking and tagging
task is less easy. For that, in many cases, models are combined with an
external language model to enhance their performance.
  In this paper we introduce a data efficient system which is trained
end-to-end, with no additional, pre-trained external module. One key feature of
our approach is an incremental training procedure where acoustic, language and
semantic models are trained sequentially one after the other. The proposed
model has a reasonable size and achieves competitive results with respect to
state-of-the-art while using a small training dataset. In particular, we reach
24.02% Concept Error Rate (CER) on MEDIA/test while training on MEDIA/train
without any additional data.
