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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:
- Upload parallel corpora (source + target sentence pairs)
- Train custom model
- Evaluate with BLEU score
- Deploy for use
BLEU Score Interpretation:
| Score Range | Quality Level |
|---|---|
| 0-19 | Low quality |
| 20-39 | Moderate quality |
| 40-59 | High 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?