for cpp websocket core dump (#828)

zhaomingwork

2023-08-10 30f0c7ff2941ab08edb8cb257eb6cef74be42ec7

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beam_size: 10
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 0.5
lm_weight: 0.7