This post covers paper BLEU: a Method for Automatic Evaluation of Machine Translation

• Why BLEU Score for Machine Translation
  • Human evaluations are expensive and time-consuming
  • BLEU Score is language independent, inexpensive and correlates with human
• Comparing Reference Translation (Human Translation) with Candidate Translation (Machine Translation)
• https://towardsdatascience.com/bleu-bilingual-evaluation-understudy-2b4eab9bcfd1
• https://leimao.github.io/blog/BLEU-Score/
• https://machinelearningmastery.com/calculate-bleu-score-for-text-python/