2020

Semi-Supervised Speech Recognition via Local Prior Matching

Hsu, Wei-Ning, Lee, Ann, Synnaeve, Gabriel et al.

Understand

For sequence transduction tasks like speech recognition, a strong structured prior model encodes rich information about the target space, implicitly ruling out invalid sequences by assigning them low probability.

  • In this work, we propose local prior matching (LPM), a semi-supervised objective that distills knowledge from a strong prior (e.g.
  • a language model) to provide learning signal to a discriminative model trained on unlabeled speech.
  • We demonstrate that LPM is theoretically well-motivated, simple to implement, and superior to existing knowledge distillation techniques under comparable settings.

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