demo.py

from sumeval.metrics.rouge import RougeCalculator


rouge = RougeCalculator(stopwords=True, lang="en")

rouge_1 = rouge.rouge_n(
            summary="I went to the Mars from my living town.",
            references="I went to Mars",
            n=1)

rouge_2 = rouge.rouge_n(
            summary="I went to the Mars from my living town.",
            references=["I went to Mars", "It's my living town"],
            n=2)

rouge_l = rouge.rouge_l(
            summary="I went to the Mars from my living town.",
            references=["I went to Mars", "It's my living town"])

# You need spaCy to calculate ROUGE-BE

rouge_be = rouge.rouge_be(
            summary="I went to the Mars from my living town.",
            references=["I went to Mars", "It's my living town"])

print("ROUGE-1: {}, ROUGE-2: {}, ROUGE-L: {}, ROUGE-BE: {}".format(
    rouge_1, rouge_2, rouge_l, rouge_be
).replace(", ", "\n"))