update SDK_advanced_guide_offline_zh.md

lyblsgo

2023-07-05 81b40eadba6f315e71be52c1d2a11d43fa13dba8

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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)