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-rw-r--r--extractor/grammar_extractor.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/extractor/grammar_extractor.cc b/extractor/grammar_extractor.cc
index 1fbdee5b..487abcaf 100644
--- a/extractor/grammar_extractor.cc
+++ b/extractor/grammar_extractor.cc
@@ -34,7 +34,7 @@ GrammarExtractor::GrammarExtractor(
vocabulary(vocabulary),
rule_factory(rule_factory) {}
-Grammar GrammarExtractor::GetGrammar(const string& sentence, const unordered_set<int> blacklisted_sentence_ids, const shared_ptr<DataArray> source_data_array) {
+Grammar GrammarExtractor::GetGrammar(const string& sentence, const unordered_set<int>& blacklisted_sentence_ids, const shared_ptr<DataArray> source_data_array) {
vector<string> words = TokenizeSentence(sentence);
vector<int> word_ids = AnnotateWords(words);
return rule_factory->GetGrammar(word_ids, blacklisted_sentence_ids, source_data_array);