add test notebook

remove useless doc

add libri ds2 exp result

eigen doc

g2p example update: add code to ignore sandhi

2. add docstring for some functions.

downgrad python env version

fix ds2 default config

* remove sequnce_mask

* format

* fix ds2 export audio shape from B,D,T to B,T,D

* down and parse cedict

* remove useless

* using third party python pinyin

* jieba as default wordseg

* remove useless

* remove pinyin dict

* using jieba.lcut

* remove doc of cedict egs

* add fan2jian test

* add description for say_digit

* refactor g2p egs

* add sha-bone; remove avg.sh from egs;

* add an example to convert transcription to pinyin with pypinyin and jieba

* format code

* 1. remove script for data downloading, since Baker dataset is not easily downloaded via terminal;
2. remove pypinyin as an extra requirement; it is alreay required by the main project;
3. clean code.

* change output format

fix doc representation

* more decoding method

* all decode method test scripts; result readme

* exp libri confi

* parallel data scripts; more mask test; need pybind11 repo

* speed perturb config

* libri conf test set

* 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 result

* add text normlization

* add space

* ctc decoding weight 0.5

* tiny decoding conf

* more label of mergify

* format doc

* add ngram lm egs

* add zhon repo

* install kenlm, zhon

* format

* add chinese_text_normalization repo

* add ngram lm egs