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How to Compute a Mock BLEU Score with n-gram Overlap in Python

Evaluate text similarity with a simplified BLEU score using word-level n-gram precision and a brevity penalty.

bleu n-grams text evaluation
Python 
from collections import Counter

def bleu_score(reference, candidate, n=2):
    """
    Compute a simplified BLEU score with n-gram precision and brevity penalty.
    Mock demo using word-level n-grams.
    """
    ref_tokens = reference.lower().split()
    cand_tokens = candidate.lower().split()
    
    # Compute n-…
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Samples are quick reference — one concept per page. For step-by-step teaching, use our Python tutorials. To test yourself, try quizzes or coding challenges. Clean up style with the Python formatter.

Related coding tools

Free online Python IDE Write and run Python in your browser — no install. Free Python code formatter Format with autopep8 — side-by-side PEP 8 cleanup.