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 (D)</p> Signup and view all the answers

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

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

Which parameter affects the memory usage of the HNSW index?

<p>M (A)</p> Signup and view all the answers

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

<p>Add an IVF component (B)</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 (B)</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 (C)</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 (B)</p> Signup and view all the answers

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

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

Which library is used to implement HNSW in this text?

<p>Faiss (B)</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 (A)</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 (D)</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 (D)</p> Signup and view all the answers

Which category does HNSW belong to?

<p>Graphs (C)</p> Signup and view all the answers

Which technique heavily contributed to HNSW?

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

What is the purpose of the probability skip list?

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

What parameter affects the memory usage of the HNSW index?

<p>M_max0 (B)</p> Signup and view all the answers

Which parameters can be modified after initializing the HNSW index?

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

Which parameter affects the recall performance in the HNSW index?

<p>M (C)</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 (A)</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 (C)</p> Signup and view all the answers

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

<p>M (B)</p> Signup and view all the answers

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

<p>max_level (D)</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 (B)</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 (C)</p> Signup and view all the answers

Which technique heavily contributed to the development of HNSW?

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

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

<p>Faiss (C)</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 (C)</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 (A)</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 (A)</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 (D)</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 (B)</p> Signup and view all the answers

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