* disable speed perturbation by default
* minor fixes
* minor updates
* updated bash scripts to incorporate with the `speed-perturb` arg
* minor fixes
1. changed the naming scheme from `speed-perturb` to `perturb-speed` to align with the librispeech recipe
>> 00256a7669/egs/librispeech/ASR/local/compute_fbank_librispeech.py (L65)
2. changed arg type for `perturb-speed` to str2bool
* copy files from zipformer librispeech
* Add byte bpe training for aishell
* compile LG graph
* Support LG decoding
* Minor fixes
* black
* Minor fixes
* export & fix pretrain.py
* fix black
* Update RESULTS.md
* Fix export.py
* Add char-based language model training process for aishell.
Add soft link from librispeech/ASR/local/sort_lm_training_data.py to aishell/ASR/local/
---------
Co-authored-by: lichao <www.563042811@qq.com>
* add MMI to AIShell
* fix MMI decode graph
* export model
* typo
* fix code style
* typo
* fix data prepare to just use train text by uid
* use a faster way to get the intersection of train and aishell_transcript_v0.8.txt
* update AIShell result
* update
* typo