How to use the pyserini.search.querybuilder.get_boost_query function in pyserini

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 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)

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()

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)