fix loss normalization for ddp training

haoneng.lhn

2023-12-08 acb9a0fec8d8a4dabeedcbb8e08c26f66d7083f0

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from modelscope.hub.snapshot_download import snapshot_download
import sys
 
 
cache_dir = sys.argv[1]
model_dir = snapshot_download('damo/speech_xvector_sv-zh-cn-cnceleb-16k-spk3465-pytorch', cache_dir=cache_dir)