bleuscore

bleuscore is a fast BLEU score calculator written in rust.

Installation

The python package has been published to pypi, so we can install it directly with many ways:

• pip

  pip install bleuscore

• poetry

  poetry add bleuscore

• uv

  uv pip install bleuscore

Quick Start

The usage is exactly same with huggingface evaluate:

- import evaluate
+ import bleuscore

predictions = ["hello there general kenobi", "foo bar foobar"]
references = [
    ["hello there general kenobi", "hello there !"],
    ["foo bar foobar"]
]

- bleu = evaluate.load("bleu")
- results = bleu.compute(predictions=predictions, references=references)
+ results = bleuscore.compute(predictions=predictions, references=references)

print(results)
# {'bleu': 1.0, 'precisions': [1.0, 1.0, 1.0, 1.0], 'brevity_penalty': 1.0, 
# 'length_ratio': 1.1666666666666667, 'translation_length': 7, 'reference_length': 6}

Benchmark

TLDR: We got more than 10x speedup when the corpus size beyond 100K

We use the demo data shown in quick start to do this simple benchmark. You can check the benchmark/simple for the benchmark source code.

• rs_bleuscore: bleuscore python library
• local_hf_bleu: huggingface evaluate bleu algorithm in local
• sacre_bleu: sacrebleu
  • Note that we got different result with sacrebleu in the simple demo data and all the rests have same result
• hf_evaluate: huggingface evaluate bleu algorithm with evaluate package

The N is used to enlarge the predictions/references size by simply duplication the demo data as shown before. We can see that as N increase, the bleuscore gets better performance. You can navigate benchmark for more benchmark details.

N=100

hyhyperfine --warmup 5 --runs 10   \
  "python simple/rs_bleuscore.py 100" \
  "python simple/local_hf_bleu.py 100" \
  "python simple/sacre_bleu.py 100"   \
  "python simple/hf_evaluate.py 100"

Benchmark 1: python simple/rs_bleuscore.py 100
  Time (mean ± σ):      19.0 ms ±   2.6 ms    [User: 17.8 ms, System: 5.3 ms]
  Range (min … max):    14.8 ms …  23.2 ms    10 runs

Benchmark 2: python simple/local_hf_bleu.py 100
  Time (mean ± σ):      21.5 ms ±   2.2 ms    [User: 19.0 ms, System: 2.5 ms]
  Range (min … max):    16.8 ms …  24.1 ms    10 runs

Benchmark 3: python simple/sacre_bleu.py 100
  Time (mean ± σ):      45.9 ms ±   2.2 ms    [User: 38.7 ms, System: 7.1 ms]
  Range (min … max):    43.5 ms …  50.9 ms    10 runs

Benchmark 4: python simple/hf_evaluate.py 100
  Time (mean ± σ):      4.504 s ±  0.429 s    [User: 0.762 s, System: 0.823 s]
  Range (min … max):    4.163 s …  5.446 s    10 runs

Summary
  python simple/rs_bleuscore.py 100 ran
    1.13 ± 0.20 times faster than python simple/local_hf_bleu.py 100
    2.42 ± 0.35 times faster than python simple/sacre_bleu.py 100
  237.68 ± 39.88 times faster than python simple/hf_evaluate.py 100

N = 1K ~ 1M

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
python simple/rs_bleuscore.py 1000	20.3 ± 1.3	18.2	21.4	1.00
python simple/local_hf_bleu.py 1000	45.8 ± 1.2	44.2	47.5	2.26 ± 0.16
python simple/rs_bleuscore.py 10000	37.8 ± 1.5	35.9	39.5	1.87 ± 0.14
python simple/local_hf_bleu.py 10000	295.0 ± 5.9	288.6	304.2	14.55 ± 0.98
python simple/rs_bleuscore.py 100000	219.6 ± 3.3	215.3	224.0	10.83 ± 0.72
python simple/local_hf_bleu.py 100000	2781.4 ± 42.2	2723.1	2833.0	137.13 ± 9.10
python simple/rs_bleuscore.py 1000000	2048.8 ± 31.4	2013.2	2090.3	101.01 ± 6.71
python simple/local_hf_bleu.py 1000000	28285.3 ± 100.9	28182.1	28396.1	1394.51 ± 90.21