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This is the [pull request #1238](https://github.com/k2-fsa/icefall/pull/1238) in icefall.
#### Streaming (with CTC head)
Best results (num of params : ~69M):
The training command:
```
./zipformer/train.py \
--world-size 4 \
--num-epochs 20 \
--use-fp16 1 \
--max-duration 600 \
--num-workers 8 \
--use-ctc 1 \
--causal 1 \
--exp-dir ./zipformer/exp-streaming
```
The decoding command:
```
./zipformer/decode.py \
--causal 1 \
--avg 1 \
--epoch 20 \
--chunk-size 32 \
--left-context-frames 256 \
--use-ctc 1 \
--exp-dir ./zipformer/exp-streaming
```
Character Error Rates (CERs) listed below are produced by the checkpoint of the 20th epoch using BPE model ( # tokens is 2000, byte fallback enabled).
| Datasets | aidatatang _200zh | aidatatang _200zh | alimeeting | alimeeting | aishell-1 | aishell-1 | aishell-2 | aishell-2 | aishell-4 | magicdata | magicdata | kespeech-asr | kespeech-asr | kespeech-asr | WenetSpeech | WenetSpeech | WenetSpeech |
|--------------------------------|------------------------------|-------------|-------------------|--------------|----------------|-------------|------------------|-------------|------------------|------------------|-------------|-----------------------|-----------------------|-------------|--------------------|-------------------------|---------------------|
| Zipformer CER (%) | dev | test | eval | test | dev | test | dev | test | test | dev | test | dev phase1 | dev phase2 | test | dev | test meeting | test net |
| CTC Decoding | 6.17 | 6.75 | 30.0 | 31.44 | 3.8 | 4.48 | 4.69 | 5.18 | 19.59 | 10.85 | 9.83 | 14.45 | 8.53 | 16.48 | 10.24 | 9.73 | 12.03 |
| Greedy Search | 4.71 | 5.18 | 33.78 | 35.2 | 3.28 | 3.63 | 4.34 | 4.76 | 21.99 | 4.65 | 3.98 | 10.42 | 3.94 | 12.54 | 8.16 | 9.73 | 9.66 |
Pre-trained model can be found here : https://huggingface.co/zrjin/icefall-asr-multi-zh-hans-zipformer-ctc-streaming-2023-11-05/
#### Non-streaming (with CTC head)
Best results (num of params : ~69M):