hierarchical navigable small world (HNSW) introduction
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Questions and Answers

Which category does HNSW belong to?

  • Trees
  • Hashes
  • Proximity graphs
  • Graphs (correct)

    • Which technique heavily contributed to HNSW?

  • Sorted array
  • Linked list
  • Skip lists
  • Probability skip list (correct)

    • What is the purpose of the probability skip list?

  • To allow fast search like a sorted array
  • To link vertices based on proximity
  • To enable easy insertion of new elements (correct)
  • To build several layers of linked lists

    • Which parameters can be modified after initializing the index?

    <p>efConstruction and efSearch</p> Signup and view all the answers

    What effect does increasing the efConstruction parameter have on search time?

    <p>Significant effect</p> Signup and view all the answers

    Which parameter affects the memory usage of the HNSW index?

    <p>M</p> Signup and view all the answers

    What can be done to improve search speeds in the HNSW index?

    <p>Add an IVF component</p> Signup and view all the answers

    Which type of graph uses both long-range and short-range links to reduce search times?

    <p>Navigable Small World (NSW) graph</p> Signup and view all the answers

    What is the stopping condition in a greedy-routing search process in an NSW graph?

    <p>Finding no nearer vertices in the current vertex's friend list</p> Signup and view all the answers

    What is the main difference between NSW and HNSW graphs?

    <p>NSW graphs have shorter edges in the highest layers, while HNSW graphs have longer edges in the lower layers</p> Signup and view all the answers

    What parameter determines the number of layers in HNSW graph construction?

    <p>The level multiplier</p> Signup and view all the answers

    Which library is used to implement HNSW in this text?

    <p>Faiss</p> Signup and view all the answers

    What does the parameter M_max0 represent in the HNSW graph construction?

    <p>The maximum number of links a vertex can have in layer 0</p> Signup and view all the answers

    What is the stopping condition for insertion in the HNSW graph construction?

    <p>Reaching the local minimum in layer 0</p> Signup and view all the answers

    What is the purpose of the assign_probas vector in the HNSW graph construction?

    <p>To determine the probability of insertion at each layer</p> Signup and view all the answers

    Which category does HNSW belong to?

    <p>Graphs</p> Signup and view all the answers

    Which technique heavily contributed to HNSW?

    <p>Both Probability Skip List and Navigable Small World Graphs</p> Signup and view all the answers

    What is the purpose of the probability skip list?

    <p>To enable fast insertion of new elements</p> Signup and view all the answers

    What is the main difference between NSW and HNSW graphs?

    <p>NSW graphs use both long-range and short-range links while HNSW graphs do not</p> Signup and view all the answers

    What parameter affects the memory usage of the HNSW index?

    <p>M_max0</p> Signup and view all the answers

    Which parameters can be modified after initializing the HNSW index?

    <p>M and efConstruction</p> Signup and view all the answers

    Which parameter affects the recall performance in the HNSW index?

    <p>M</p> Signup and view all the answers

    Which parameter has a significant effect on search time when using a large number of queries in the HNSW index?

    <p>efConstruction</p> Signup and view all the answers

    What is the impact of increasing the efConstruction parameter in the HNSW index?

    <p>Increases recall with little effect on search time</p> Signup and view all the answers

    What is the main factor that affects the memory usage of the HNSW index?

    <p>M</p> Signup and view all the answers

    Which parameter determines the number of layers in the HNSW graph construction?

    <p>max_level</p> Signup and view all the answers

    What is the purpose of the probability skip list in the HNSW graph construction?

    <p>To assign probabilities for vector insertion at different levels</p> Signup and view all the answers

    What does the parameter M_max0 represent in the HNSW graph construction?

    <p>The maximum number of links a vertex can have</p> Signup and view all the answers

    Which technique heavily contributed to the development of HNSW?

    <p>Greedy routing</p> Signup and view all the answers

    Which library is used to implement the HNSW index in this text?

    <p>Faiss</p> Signup and view all the answers

    What is the main purpose of the 'zoom-out' phase in the greedy-routing search process in an NSW graph?

    <p>To pass through low-degree vertices</p> Signup and view all the answers

    What is the main difference between HNSW and NSW graphs?

    <p>HNSW has a hierarchical multi-layer structure, while NSW does not</p> Signup and view all the answers

    What is the purpose of the 'level multiplier' parameter in HNSW graph construction?

    <p>To balance the overlap and the number of traversals</p> Signup and view all the answers

    What is the stopping condition for the greedy-routing search process in an NSW graph?

    <p>Finding no nearer vertices in the current vertex's friend list</p> Signup and view all the answers

    What effect does decreasing the 'level multiplier' have on HNSW graph construction?

    <p>Minimizes overlap of shared neighbors across layers</p> Signup and view all the answers

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