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Multitask Learning with Low-Level Auxiliary Tasks for Encoder-Decoder Based Speech Recognition

Abstract · Apr 5, 2017 19:44 ·

cs-cl cs-ai

Arxiv Abstract

  • Shubham Toshniwal
  • Hao Tang
  • Liang Lu
  • Karen Livescu

End-to-end training of deep learning-based models allows for implicit learning of intermediate representations based on the final task loss. However, the end-to-end approach ignores the useful domain knowledge encoded in explicit intermediate-level supervision. We hypothesize that using intermediate representations as auxiliary supervision at lower levels of deep networks may be a good way of combining the advantages of end-to-end training and more traditional pipeline approaches. We present experiments on conversational speech recognition where we use lower-level tasks, such as phoneme recognition, in a multitask training approach with an encoder-decoder model for direct character transcription. We compare multiple types of lower-level tasks and analyze the effects of the auxiliary tasks. Our results on the Switchboard corpus show that this approach improves recognition accuracy over a standard encoder-decoder model on the Eval2000 test set.

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