iskm/wordfreq
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change math for INFERRED_SPACE_FACTOR to not overflow

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This commit is contained in:
Robyn Speer 2021-02-18 14:44:39 -05:00
parent 7318f58df9
commit 75a56b68fb
2 changed files with 9 additions and 1 deletions
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8
tests/test_chinese.py
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@ -77,3 +77,11 @@ def test_alternate_codes():
# Separate codes for Mandarin and Cantonese
assert tokenize('谢谢谢谢', 'cmn') == tokens
assert tokenize('谢谢谢谢', 'yue') == tokens
def test_unreasonably_long():
# This crashed earlier versions of wordfreq
lots_of_ls = 'l' * 800
assert word_frequency(lots_of_ls, 'zh') < 1e-300
assert zipf_frequency(lots_of_ls, 'zh') == 0.

2
wordfreq/__init__.py
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@ -263,7 +263,7 @@ def _word_frequency(word, lang, wordlist, minimum):
# If we used the Jieba tokenizer, we could tokenize anything to match
# our wordlist, even nonsense. To counteract this, we multiply by a
# probability for each word break that was inferred.
freq /= INFERRED_SPACE_FACTOR ** (len(tokens) - 1)
freq *= INFERRED_SPACE_FACTOR ** -(len(tokens) - 1)
# All our frequency data is only precise to within 1% anyway, so round
# it to 3 significant digits