wenetspeech
* Comply to issue #1149 https://github.com/k2-fsa/icefall/issues/1149
* Fix not enough values to unpack error . * [WIP] Pruned transducer stateless2 for AISHELL-1 * fix the style issue * code format for black * add pruned-transducer-stateless2 results for AISHELL-1 * simplify result