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What distance metrics does Qdrant support? What is a segment in Qdrant? What is a collection in Qdrant? What is the HNSW algorithm? How do you insert/upsert points into a collection? Define scalar quantization in Qdrant? How do you implement multi-vector (late interaction / ColBERT-style) search in Qdrant? What is Qdrant? What is a payload in Qdrant? What is payload filtering in Qdrant? What is oversampling and rescoring in quantized search? How do you create a collection in Qdrant? What is the difference between REST and gRPC APIs in Qdrant? What client libraries are available for Qdrant? Explain hybrid search using the Query API and Prefetch? What is the difference between keeping vectors on-disk versus the HNSW index in RAM? What is the purpose of Qdrant? What are the key features of Qdrant? What is a point in Qdrant? How do you perform a similarity search in Qdrant?

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