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5.1.3. Custom Translator and BLEU Scores

  • Concept: Train translation models on your domain-specific content
  • Purpose: Improve translation quality for specialized terminology
  • Benefit: Professional-quality translations for your domain
Custom Translator Workflow:
  1. Upload parallel corpora (source + target sentence pairs)
  2. Train custom model
  3. Evaluate with BLEU score
  4. Deploy for use
BLEU Score Interpretation:
Score RangeQuality Level
0-19Low quality
20-39Moderate quality
40-59High quality
60+Very high quality (rare)

Exam Alert: A BLEU score of 40-59 indicates "high quality" translation.

Key Trade-Offs:
  • Generic vs. Custom: Generic translation works immediately but may miss domain terms; custom requires training data investment
  • BLEU Score vs. Human Evaluation: BLEU correlates with quality but doesn't capture all aspects of good translation

Reflection Question: Your custom translator has a BLEU score of 35. Is this production-ready? What would you do to improve it?