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Evaluating Neural Machine Translation
in English-Japanese Task
(TEAM ID: WEBLIO MT)
Zhongyuan Zhu
@raphaelshu
1
Empirically evaluate various models in EJ task
‣ Two network architectures
2
‣ Three recurrent units
‣ LSTM, GRU, IRNN
multi-layer encoder-decoder model soft-attention model
‣ Two kinds of training data
‣ naturally-ordered, pre-reordered
Results: perplexities
3
Results: evaluation scores
4
BLEU RIBES HUMAN JPO
Baseline phrase-based SMT 29.80 0.691
Baseline hierarchical phrase-based SMT 32.56 0.746
Baseline Tree-to-string SMT 33.44 0.758 30.00
Submitted system 1
(NMT)
34.19 0.802 43.50
Submitted system 2
(NMT + System combination)
36.21 0.809 53.75 3.81
Best competitor 1: NAIST
(Travatar System with NeuralMT Reranking)
38.17 0.813 62.25 4.04
Best competitor 2: naver
(SMT t2s + Spell correction + NMT reranking)
36.14 0.803 53.25 4.00
Finding & Insights
‣ Soft-attention models outperforms multi-layer
encoder-decoder models
‣ Training models on pre-reordered data hurts
the performance
‣ NMT models tend to make grammatically
valid but incomplete translations
5
Thanks.
6

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Evaluating Neural Machine Translation Models for English-Japanese Task

  • 1. Evaluating Neural Machine Translation in English-Japanese Task (TEAM ID: WEBLIO MT) Zhongyuan Zhu @raphaelshu 1
  • 2. Empirically evaluate various models in EJ task ‣ Two network architectures 2 ‣ Three recurrent units ‣ LSTM, GRU, IRNN multi-layer encoder-decoder model soft-attention model ‣ Two kinds of training data ‣ naturally-ordered, pre-reordered
  • 4. Results: evaluation scores 4 BLEU RIBES HUMAN JPO Baseline phrase-based SMT 29.80 0.691 Baseline hierarchical phrase-based SMT 32.56 0.746 Baseline Tree-to-string SMT 33.44 0.758 30.00 Submitted system 1 (NMT) 34.19 0.802 43.50 Submitted system 2 (NMT + System combination) 36.21 0.809 53.75 3.81 Best competitor 1: NAIST (Travatar System with NeuralMT Reranking) 38.17 0.813 62.25 4.04 Best competitor 2: naver (SMT t2s + Spell correction + NMT reranking) 36.14 0.803 53.25 4.00
  • 5. Finding & Insights ‣ Soft-attention models outperforms multi-layer encoder-decoder models ‣ Training models on pre-reordered data hurts the performance ‣ NMT models tend to make grammatically valid but incomplete translations 5