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SCIENTIA SINICA Informationis, Volume 47 , Issue 8 : 1036(2017) https://doi.org/10.1360/N112016-00281

Learning dependency edge transfer rule representation using encoder-decoder

More info
  • ReceivedMar 8, 2016
  • AcceptedApr 2, 2016
  • PublishedJun 20, 2017

Abstract


Funded by

国家自然科学基金(61379086)


References

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  • Figure 1

    Dependency edge transfer rules. (a) Dependency tree and word alignment; (b) extracted dependency edge transfer rules; (c) generalisation of transfer rules; (d) ambiguities of dependency edge transfer rules

  • Figure 2

    Dependency edge transfer translation process. (a), (b) Analysis; (c) transfer; (d)$\sim$(f) generation

  • Figure 3

    Dependency edge transfer rule encoder-decoder

  • Figure 4

    Source dependency edge encoder

  •   

    Algorithm 1 在翻译解码时使用依存边转换翻译规则编码解码器计算目标端依存边的概率

    Require: 源端依存树的节点$n$; 依存边转换翻译规则集合$R$; 依存边转换翻译规则编码解码器$D$;

    Output: 节点$n$作为头节点时, 所有源端依存边对应的候选目标端依存边的概率集合$P$;

    if $n$ 不是叶子节点 then

    抽取该节点与其所有依存节点之间的源端依存边集合$E$;

    for $e\in E$

    利用$R$, 将$e$投射得到候选目标端依存边集合$F$;

    将$e$输入到$D$中;

    在$D$的输出层, 计算$F$中每条候选目标端依存边的概率$p$;

    将$p$放入集合$P$中;

    end for

    return $P$

    end if

  • Table 1   BLEU-4 scores (%) on NIST MT03$\sim$05 $^{\rm a)b)}$
    System MT03 MT04 MT05 Average
    Moses 32.30 33.43 31.44 32.39
    DEBT 32.57 35.06 31.36 32.99
    +DETED 33.8* 36.58* 32.76* 34.38
  • Table 2   BLEU-4 scores (%) of different components
    System MT03 MT04 MT05 Average
    DEBT 32.57 35.06 31.36 32.99
    +${\rm head}_{\rm tgt}$ 33.52 36.35 31.67 33.85
    +${\rm dep}_{\rm tgt}$ 33.43 35.81 31.40 33.55
    +${\rm lr}_{\rm tgt}$ 33.30 36.32 32.10 33.91
    +${\rm cd}_{\rm tgt}$ 33.41 36.50 32.39 34.10
    +DETED 33.80 36.58 32.76 34.38
  • Table 3   BLEU-4 scores (%) on NIST MT03$\sim$05 test set, with different contexts as input $^{\rm c)d)}$
    System MT03 MT04 MT05 Average
    DEBT 32.57 35.06 31.36 32.99
    +nocon 33.56 36.06 32.37 33.99
    +con1 33.80 36.58 32.76 34.38
    +con2 33.73 36.52 32.45 34.23
    +con3 33.94 36.24 32.49 34.22
  • Table 4   Decoding time cost on NIST MT03
    System Decoding time cost (s) Diff
    Moses 1081.71
    DEBT 1090.89
    +DETED 1297.83 +18.97%