Modified the value of Element and added Bleu test #435
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Description:Modified the value of Element and added Bleu test
Main reason:
1.对于Element,backend中的value值从原来的float类型扩展到list类型,可以支持更多情况。
2.增加了Bleu支持,并且针对四个主流框架都进行了测试
Checklist 检查下面各项是否完成
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Changes: 逐项描述修改的内容
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