A Relationship: Word Alignment, Phrase Table, and Translation Quality

Table 2

Pruned phrase table and translation quality.

Pruning methods	Languages	Pruning rates	BLEU (Δ)
Count/significant	fr-en	64.6%~85.9%	−0.1
	es-en	67.9%~88.1%
	de-en	62.7%~84.1%
Entropy	fr-en	85%~95%	−1.0
	es-en	85%~95%
	de-en	85%~95%
Bilingual-segment	fr-en	—	−1.2
	es-en	98%
	de-en	94%