A tiny version of Zipformer-Transducer (https://github.com/k2-fsa/icefall/tree/master/egs/librispeech/ASR/pruned_transducer_stateless7).

Number of model parameters: 20697573

Decoding results at epoch-30-avg-9:

• greedy_search: 2.67 & 6.4
• modified_beam_search: 2.6 & 6.26
• fast_beam_search: 2.64 & 6.3