fix batch infer

#10

by kuaizhirui - opened Jun 18

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Jun 18

解决左pad之后 batch infer总是输出unk的问题或者和单条样本推理结果不一致的问题，本质上精度不一致的问题，由expanded_attn_mask和combined_attention_mask相加导致的，因此先换成torch.finfo(dtype).min的一半

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