Enforcing Encoder-Decoder Modularity in Sequence-to-Sequence Models

9 Nov 2019 · Siddharth Dalmia, Abdel-rahman Mohamed, Mike Lewis, Florian Metze, Luke Zettlemoyer ·

Inspired by modular software design principles of independence, interchangeability, and clarity of interface, we introduce a method for enforcing encoder-decoder modularity in seq2seq models without sacrificing the overall model quality or its full differentiability. We discretize the encoder output units into a predefined interpretable vocabulary space using the Connectionist Temporal Classification (CTC) loss. Our modular systems achieve near SOTA performance on the 300h Switchboard benchmark, with WER of 8.3% and 17.6% on the SWB and CH subsets, using seq2seq models with encoder and decoder modules which are independent and interchangeable.

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LSTM • Seq2Seq • Sigmoid Activation • Tanh Activation

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