BLEU score

The BLEU (Bilingual Evaluation Understudy) score measures how well a machine-generated text, like a translation, matches a set of high-quality reference texts. It compares the words and phrases in the generated output to the reference, checking for overlap. The score ranges from 0 to 1, where higher values indicate greater similarity and better quality. Essentially, BLEU assesses how closely the machine’s output resembles human translations, providing a quantitative way to evaluate and improve language generation systems.