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Table 4 

BLEU, WER, and KSMR results for the XRCE test corpora using conventional (batch learning without retraining) and online SMT systems. Both systems used MERT to adjust log-linear weights. The average online learning time (LT) in seconds is shown for the online system.

CorpusSMT systemBLEUWERKSMRLT (sec)
Eng–Spa conventional 58.3±2.4 32.5±1.9 19.3±1.2 
online 64.0±2.4 28.1±1.7 16.6±1.1 0.06 
Eng–Fre conventional 32.2±2.2 63.7±2.2 36.7±1.2 
online 43.7±2.3 48.4±2.2 30.3±1.2 0.09 
Eng–Ger conventional 20.5±1.9 72.4±1.9 42.9±1.1 
online 28.9±2.1 61.7±2.1 37.0±1.3 0.07 
CorpusSMT systemBLEUWERKSMRLT (sec)
Eng–Spa conventional 58.3±2.4 32.5±1.9 19.3±1.2 
online 64.0±2.4 28.1±1.7 16.6±1.1 0.06 
Eng–Fre conventional 32.2±2.2 63.7±2.2 36.7±1.2 
online 43.7±2.3 48.4±2.2 30.3±1.2 0.09 
Eng–Ger conventional 20.5±1.9 72.4±1.9 42.9±1.1 
online 28.9±2.1 61.7±2.1 37.0±1.3 0.07 
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