Please refer to https://k2-fsa.github.io/icefall/recipes/Non-streaming-ASR/aishell/index.html for how to run models in this recipe.
Aishell is an open-source Chinese Mandarin speech corpus published by Beijing Shell Shell Technology Co., Ltd. 400 people from different accent areas in China are invited to participate in the recording, which is conducted in a quiet indoor environment using high fidelity microphone and downsampled to 16kHz. The manual transcription accuracy is above 95%, through professional speech annotation and strict quality inspection. The data is free for academic use. We hope to provide moderate amount of data for new researchers in the field of speech recognition.
(From Open Speech and Language Resources)
There are various folders containing the name transducer in this folder.
The following table lists the differences among them.
| Encoder | Decoder | Comment | |
|---|---|---|---|
transducer_stateless |
Conformer | Embedding + Conv1d | with k2.rnnt_loss |
transducer_stateless_modified |
Conformer | Embedding + Conv1d | with modified transducer from optimized_transducer |
transducer_stateless_modified-2 |
Conformer | Embedding + Conv1d | with modified transducer from optimized_transducer + extra data |
pruned_transducer_stateless3 |
Conformer (reworked) | Embedding + Conv1d | pruned RNN-T + reworked model with random combiner + using aidatatang_20zh as extra data |
pruned_transducer_stateless7 |
Zipformer | Embedding | pruned RNN-T + zipformer encoder + stateless decoder with context-size 1 |
The decoder in transducer_stateless is modified from the paper
Rnn-Transducer with Stateless Prediction Network.
We place an additional Conv1d layer right after the input embedding layer.