Product Quantization for Nearest Neighbor Search, Hervé Jégou, Matthijs Douze, Cordelia Schmid, 2011IEEE Transactions on Pattern Analysis and Machine Intelligence, Vol. 33DOI: 10.1109/TPAMI.2010.57 - This seminal work introduces Product Quantization (PQ), the core technique that OPQ extends, providing a method for high-dimensional vector compression and approximate nearest neighbor search.
Faiss: A Library for Efficient Similarity Search, Hervé Jégou, Matthijs Douze, Armand Joulin, 2019Advances in Neural Information Processing Systems (NeurIPS 2019 Systems and Demonstrations) - This paper describes the Faiss library, which provides efficient implementations of various approximate nearest neighbor search algorithms, including OPQ, as demonstrated in the section's code example.