Polyglot Technology LLC
The BLEU Score Automatic Metric
TAUS Test Set
TAUS selects the machine translation customization data by querying its large repository of highquality translation data with a domain-specific text. The resulting customization dataset is then split at random into a larger training set for Amazon Translate Active Custom Translation and a smaller 2,000 sentence test set that was provided to Polyglot Technology for evaluation with the BLEU Score.
Summary Evaluation Results
The customization of Amazon Translate with TAUS Data improved the BLEU score for all language pairs (as evaluated with the test sets):
- by more than 6 BLEU points, or 15.3% on average
- by 2 BLEU points at a minimum
For an even more detailed evaluation including analysis of most improved translations, please see the individual evaluation reports for each language pair and domain available on request from firstname.lastname@example.org.
Figure 1: BLEU Scores for the TAUS Test Sets for the E-Commerce Domain
TAUS Matching Data
Interpreting BLEU Scores
BLEU (BiLingual Evaluation Understudy) is a metric for automatically evaluating machine-translated text. The BLEU score is a number between zero and one that measures the similarity of the machine-translated text to a set of high quality reference translations. A value of 0 means that the machine-translated output has no overlap with the reference translation (low quality) while a value of 1 means there is perfect overlap with the reference translations (high quality).
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