Learn to Use Future Information in Simultaneous Translation
Table 2: Ablation study for feature selection on IWSLT’14 En→De dataset.
['[EMPTY]', '[ITALIC] k=3 BLEU', '[ITALIC] k=3 AP', '[ITALIC] k=3 AL', '[ITALIC] k=5 BLEU', '[ITALIC] k=5 AP', '[ITALIC] k=5 AL']
(II) Action space selection: In previous experiments, both future information and past information are leveraged. That is, given a strategy wait-k, the controller φ can sample a strategy wait-k′ where k′≥k or k′≤k. We want to study the effect of using past information or future information only. For any wait-k, we build another two action spaces for φ: Kp(k)={1,2,⋯,k}; Kf(k)={k,k+1,⋯,K}. We evaluate wait-3,5 on IWSLT’14 En→De with the above two action spaces.