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4 changes: 2 additions & 2 deletions tensorflow_text/core/kernels/string_vocab.cc
Original file line number Diff line number Diff line change
Expand Up @@ -33,7 +33,7 @@ LookupStatus StringVocab::Contains(absl::string_view key, bool* value) const {
absl::optional<int> StringVocab::LookupId(absl::string_view key) const {
auto it = index_map_.find(key);
if (it == index_map_.end()) {
return absl::nullopt;
return std::nullopt;
} else {
return it->second;
}
Expand All @@ -42,7 +42,7 @@ absl::optional<int> StringVocab::LookupId(absl::string_view key) const {
// Returns the key of `vocab_id` or empty if `vocab_id` is not valid.
absl::optional<absl::string_view> StringVocab::LookupWord(int vocab_id) const {
if (vocab_id >= vocab_.size() || vocab_id < 0) {
return absl::nullopt;
return std::nullopt;
}
return vocab_[vocab_id];
}
Expand Down