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# Copyright 2019-2020 by Christopher C. Little.
# This file is part of Abydos.
#
# Abydos is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Abydos is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Abydos. If not, see <http://www.gnu.org/licenses/>.
"""abydos.tests.distance.test_distance_tf_idf.
This module contains unit tests for abydos.distance.TFIDF
"""
import os
import unittest
from abydos.corpus import UnigramCorpus
from abydos.distance import TFIDF
from abydos.tokenizer import QGrams
from abydos.util import download_package, package_path
class TFIDFTestCases(unittest.TestCase):
"""Test TFIDF functions.
abydos.distance.TFIDF
"""
cmp = TFIDF()
def test_tf_idf_sim(self):
"""Test abydos.distance.TFIDF.sim."""
# Base cases
self.assertEqual(self.cmp.sim('', ''), 0.0)
self.assertEqual(self.cmp.sim('a', ''), 0.0)
self.assertEqual(self.cmp.sim('', 'a'), 0.0)
self.assertEqual(self.cmp.sim('abc', ''), 0.0)
self.assertEqual(self.cmp.sim('', 'abc'), 0.0)
self.assertEqual(self.cmp.sim('abc', 'abc'), 1.0)
self.assertEqual(self.cmp.sim('abcd', 'efgh'), 0.0)
self.assertAlmostEqual(self.cmp.sim('Nigel', 'Niall'), 0.304044497)
self.assertAlmostEqual(self.cmp.sim('Niall', 'Nigel'), 0.304044497)
self.assertAlmostEqual(self.cmp.sim('Colin', 'Coiln'), 0.304044497)
self.assertAlmostEqual(self.cmp.sim('Coiln', 'Colin'), 0.304044497)
self.assertAlmostEqual(
self.cmp.sim('ATCAACGAGT', 'AACGATTAG'), 0.4676712137
)
def test_tf_idf_dist(self):
"""Test abydos.distance.TFIDF.dist."""
# Base cases
self.assertEqual(self.cmp.dist('', ''), 1.0)
self.assertEqual(self.cmp.dist('a', ''), 1.0)
self.assertEqual(self.cmp.dist('', 'a'), 1.0)
self.assertEqual(self.cmp.dist('abc', ''), 1.0)
self.assertEqual(self.cmp.dist('', 'abc'), 1.0)
self.assertEqual(self.cmp.dist('abc', 'abc'), 0.0)
self.assertEqual(self.cmp.dist('abcd', 'efgh'), 1.0)
self.assertAlmostEqual(self.cmp.dist('Nigel', 'Niall'), 0.695955503)
self.assertAlmostEqual(self.cmp.dist('Niall', 'Nigel'), 0.695955503)
self.assertAlmostEqual(self.cmp.dist('Colin', 'Coiln'), 0.695955503)
self.assertAlmostEqual(self.cmp.dist('Coiln', 'Colin'), 0.695955503)
self.assertAlmostEqual(
self.cmp.dist('ATCAACGAGT', 'AACGATTAG'), 0.5323287863
)
@unittest.skip('cannot download in Debian build')
def test_tf_idf_corpus(self):
"""Test abydos.distance.TFIDF.sim & .dist with corpus."""
q3_corpus = UnigramCorpus(word_tokenizer=QGrams(qval=3))
download_package('en_qgram', silent=True)
q3_corpus.load_corpus(
os.path.join(package_path('en_qgram'), 'q3_en.dat')
)
cmp_q3 = TFIDF(tokenizer=QGrams(qval=3), corpus=q3_corpus)
self.assertAlmostEqual(cmp_q3.sim('Nigel', 'Niall'), 0.259985047)
self.assertAlmostEqual(cmp_q3.sim('Niall', 'Nigel'), 0.259985047)
self.assertAlmostEqual(cmp_q3.sim('Colin', 'Coiln'), 0.114867563)
self.assertAlmostEqual(cmp_q3.sim('Coiln', 'Colin'), 0.114867563)
self.assertAlmostEqual(cmp_q3.dist('Nigel', 'Niall'), 0.740014953)
self.assertAlmostEqual(cmp_q3.dist('Niall', 'Nigel'), 0.740014953)
self.assertAlmostEqual(cmp_q3.dist('Colin', 'Coiln'), 0.885132437)
self.assertAlmostEqual(cmp_q3.dist('Coiln', 'Colin'), 0.885132437)
if __name__ == '__main__':
unittest.main()
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