[Export] support gpu inference

wanchen.swc

2023-03-30 cfc4d402093060fe087424b0a6be4e2b2546eae8

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beam_size: 1
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 0.0
lm_weight: 0.15