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# -*- coding: utf-8 -*- |
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# Copyright 2018 by Christopher C. Little. |
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# This file is part of Abydos. |
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# |
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# Abydos is free software: you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation, either version 3 of the License, or |
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# (at your option) any later version. |
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# |
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# Abydos is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with Abydos. If not, see <http://www.gnu.org/licenses/>. |
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"""abydos.fingerprint._count. |
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Cisłak & Grabowski's count fingerprint |
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""" |
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from __future__ import ( |
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absolute_import, |
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division, |
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print_function, |
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unicode_literals, |
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) |
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from collections import Counter |
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from ._fingerprint import MOST_COMMON_LETTERS_CG, _Fingerprint |
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__all__ = ['Count', 'count_fingerprint'] |
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class Count(_Fingerprint): |
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"""Count Fingerprint. |
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Based on the count fingerprint from :cite:`Cislak:2017`. |
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""" |
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def fingerprint(self, word, n_bits=16, most_common=MOST_COMMON_LETTERS_CG): |
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"""Return the count fingerprint. |
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Parameters |
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---------- |
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word : str |
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The word to fingerprint |
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n_bits : int |
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Number of bits in the fingerprint returned |
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most_common : list |
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The most common tokens in the target language, ordered by frequency |
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Returns |
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------- |
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int |
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The count fingerprint |
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Examples |
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-------- |
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>>> cf = Count() |
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>>> bin(cf.fingerprint('hat')) |
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'0b1010000000001' |
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>>> bin(cf.fingerprint('niall')) |
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'0b10001010000' |
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>>> bin(cf.fingerprint('colin')) |
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'0b101010000' |
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>>> bin(cf.fingerprint('atcg')) |
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'0b1010000000000' |
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>>> bin(cf.fingerprint('entreatment')) |
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'0b1111010000100000' |
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""" |
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if n_bits % 2: |
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n_bits += 1 |
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word = Counter(word) |
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fingerprint = 0 |
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for letter in most_common: |
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if n_bits: |
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fingerprint <<= 2 |
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fingerprint += word[letter] & 3 |
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n_bits -= 2 |
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else: |
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break |
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if n_bits: |
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fingerprint <<= n_bits |
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return fingerprint |
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def count_fingerprint(word, n_bits=16, most_common=MOST_COMMON_LETTERS_CG): |
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"""Return the count fingerprint. |
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This is a wrapper for :py:meth:`Count.fingerprint`. |
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Parameters |
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---------- |
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word : str |
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The word to fingerprint |
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n_bits : int |
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Number of bits in the fingerprint returned |
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most_common : list |
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The most common tokens in the target language, ordered by frequency |
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Returns |
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------- |
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int |
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The count fingerprint |
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Examples |
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-------- |
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>>> bin(count_fingerprint('hat')) |
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'0b1010000000001' |
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>>> bin(count_fingerprint('niall')) |
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'0b10001010000' |
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>>> bin(count_fingerprint('colin')) |
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'0b101010000' |
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>>> bin(count_fingerprint('atcg')) |
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'0b1010000000000' |
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>>> bin(count_fingerprint('entreatment')) |
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'0b1111010000100000' |
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""" |
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return Count().fingerprint(word, n_bits, most_common) |
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if __name__ == '__main__': |
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import doctest |
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doctest.testmod() |
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chrislit /
abydos
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