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#
# Pyserini: Reproducible IR research with sparse and dense representations
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import os
import shutil
import tarfile
import unittest
from random import randint
from urllib.request import urlretrieve
from pyserini.analysis import get_lucene_analyzer
from pyserini.search.lucene import LuceneSearcher, querybuilder
class TestQueryBuilding(unittest.TestCase):
def setUp(self):
# Download pre-built CACM index built using Lucene 9; append a random value to avoid filename clashes.
r = randint(0, 10000000)
self.collection_url = 'https://github.com/castorini/anserini-data/raw/master/CACM/lucene9-index.cacm.tar.gz'
self.tarball_name = 'lucene-index.cacm-{}.tar.gz'.format(r)
self.index_dir = 'index{}/'.format(r)
filename, headers = urlretrieve(self.collection_url, self.tarball_name)
tarball = tarfile.open(self.tarball_name)
tarball.extractall(self.index_dir)
tarball.close()
self.searcher = LuceneSearcher(f'{self.index_dir}lucene9-index.cacm')
def testBuildBoostedQuery(self):
term_query1 = querybuilder.get_term_query('information')
term_query2 = querybuilder.get_term_query('retrieval')
boost1 = querybuilder.get_boost_query(term_query1, 2.)
boost2 = querybuilder.get_boost_query(term_query2, 2.)
should = querybuilder.JBooleanClauseOccur['should'].value
boolean_query = querybuilder.get_boolean_query_builder()
boolean_query.add(boost1, should)
boolean_query.add(boost2, should)
bq = boolean_query.build()
hits1 = self.searcher.search(bq)
boolean_query2 = querybuilder.get_boolean_query_builder()
boolean_query2.add(term_query1, should)
boolean_query2.add(term_query2, should)
bq2 = boolean_query2.build()
hits2 = self.searcher.search(bq2)
for h1, h2 in zip(hits1, hits2):
self.assertEqual(h1.docid, h2.docid)
self.assertAlmostEqual(h1.score, h2.score*2, delta=0.001)
boost3 = querybuilder.get_boost_query(term_query1, 2.)
boost4 = querybuilder.get_boost_query(term_query2, 3.)
boolean_query = querybuilder.get_boolean_query_builder()
boolean_query.add(boost3, should)
boolean_query.add(boost4, should)
bq3 = boolean_query.build()
hits3 = self.searcher.search(bq3)
for h1, h3 in zip(hits1, hits3):
self.assertNotEqual(h1.score, h3.score)
def testTermQuery(self):
should = querybuilder.JBooleanClauseOccur['should'].value
query_builder = querybuilder.get_boolean_query_builder()
query_builder.add(querybuilder.get_term_query('information'), should)
query_builder.add(querybuilder.get_term_query('retrieval'), should)
query = query_builder.build()
hits1 = self.searcher.search(query)
hits2 = self.searcher.search('information retrieval')
for h1, h2 in zip(hits1, hits2):
self.assertEqual(h1.docid, h2.docid)
self.assertEqual(h1.score, h2.score)
def testIncompatabilityWithRM3(self):
should = querybuilder.JBooleanClauseOccur['should'].value
query_builder = querybuilder.get_boolean_query_builder()
query_builder.add(querybuilder.get_term_query('information'), should)
query_builder.add(querybuilder.get_term_query('retrieval'), should)
query = query_builder.build()
hits = self.searcher.search(query)
self.assertEqual(10, len(hits))
self.searcher.set_rm3()
self.assertTrue(self.searcher.is_using_rm3())
with self.assertRaises(NotImplementedError):
self.searcher.search(query)
def testTermQuery2(self):
term_query1 = querybuilder.get_term_query('inform', analyzer=get_lucene_analyzer(stemming=False))
term_query2 = querybuilder.get_term_query('retriev', analyzer=get_lucene_analyzer(stemming=False))
should = querybuilder.JBooleanClauseOccur['should'].value
boolean_query1 = querybuilder.get_boolean_query_builder()
boolean_query1.add(term_query1, should)
boolean_query1.add(term_query2, should)
bq1 = boolean_query1.build()
hits1 = self.searcher.search(bq1)
hits2 = self.searcher.search('information retrieval')
for h1, h2 in zip(hits1, hits2):
self.assertEqual(h1.docid, h2.docid)
self.assertEqual(h1.score, h2.score)
def tearDown(self):
self.searcher.close()
os.remove(self.tarball_name)
shutil.rmtree(self.index_dir)
if __name__ == '__main__':
unittest.main()
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