* fixes for `diagnostics`
Replace `2 ** 22` with `512` as the default value of `diagnostics.TensorDiagnosticOptions`
also black formatted some scripts
* fixed formatting issues
* 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