This is an open source project (formerly named Listen, Attend and Spell - PyTorch Implementation) for end-to-end ASR implemented with Pytorch, the well known deep learning toolkit.
MIT License
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What is the ctc loss? The model is considered to be successfully trained #75
You may refer to the paper Connectionist Temporal Classification: Labelling Unsegmented Sequence Data with Recurrent Neural Networks or this website to better understand CTC loss.