* fixes for `diagnostics`
Replace `2 ** 22` with `512` as the default value of `diagnostics.TensorDiagnosticOptions`
also black formatted some scripts
* fixed formatting issues
* initial commit for zipformer tedlium
* fix unk decoding
* add pretrained model and logs
* update for new AsrModel
* add option for choosing rnnt type
* add results with modified rnnt