fix loss normalization for ddp training

haoneng.lhn

2023-12-08 acb9a0fec8d8a4dabeedcbb8e08c26f66d7083f0

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# The conformer transducer decoding configuration from @jeon30c
beam_size: 10
simu_streaming: false
streaming: true
chunk_size: 16
left_context: 16
right_context: 0