The C++ reference benchmark under
Benchmarks/HNSWReferenceComparison/Sources/hnswlib contains files derived
from hnswlib.
hnswlib is licensed under the Apache License, Version 2.0. The applicable
license text is provided in
Benchmarks/HNSWReferenceComparison/LICENSE-APACHE-2.0.
This notice applies to the reference benchmark material only. The SwiftHNSW source is licensed separately under the repository's MIT License.