spaCy/spacy/tests/regression/test_issue3447.py

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from spacy.util import decaying
def test_decaying():
sizes = decaying(10., 1., .5)
size = next(sizes)
assert size == 10.
size = next(sizes)
assert size == 10. - 0.5
size = next(sizes)
assert size == 10. - 0.5 - 0.5