train ds2 model (#622)
* default cmvn compute config; more log of grad clip; diff ds2 cmvn compute and conf; ds2 lr step by epoch; * fix ds2 config * fix install and egs link * sox speed pertrub shape (T, C), float64, process using int32 * fix libri ds2 scripts; add ngram and spm doc * aishell ds2 cer7.86 * fix ds2 resultpull/625/head
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# Aishell-1
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## CTC
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| Model | Config | Test set | CER |
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| --- | --- | --- | --- |
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| DeepSpeech2 | conf/deepspeech2.yaml | test | 0.078977 |
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| DeepSpeech2 | release 1.8.5 | test | 0.080447 |
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## Deepspeech2
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| Model | release | Config | Test set | CER |
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| --- | --- | --- | --- | --- |
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| DeepSpeech2 | 2.1 | conf/deepspeech2.yaml | test | 0.078671 |
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| DeepSpeech2 | 2.0 | conf/deepspeech2.yaml | test | 0.078977 |
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| DeepSpeech2 | 1.8.5 | - | test | 0.080447 |
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# Ngram LM
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Train chinese chararctor ngram lm by [kenlm](https://github.com/kpu/kenlm).
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```
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bash run.sh
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```
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