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