There actually are practical algorithms for finding approximate nearest neighbors (ANN) at large scales. Some of them are open source like HNSW [1] and Faiss [2

There actually are practical algorithms for finding approximate nearest neighbors (ANN) at large scales. Some of them are open source like HNSW [1] and Faiss [2], and some are even offered inside managed services like Pinecone.[3] [1] https://www.pinecone.io/learn/hnsw/ https://www.pinecone.io/learn/hnsw/ [2] https://www.pinecone.io/learn/faiss/ https://www.pinecone.io/learn/faiss/ [3] https://www.pinecone.io/ https://www.pinecone.io/