[R] Parallelising Heirarchical Small World Graphs

HNSW (Heirarchical Navigable Small World graphs) were introduced in an excellent and very readable paper [Yu A. Malkov, D. A. Yashunin](https://arxiv.org/abs/1603.09320) which has given rise to a large number of implementations which are at the core of many popular vector databases.

The HNSW is a method of searching for vectors in a dataset which are *close* to a given query vector. The basic idea of an HNSW is to make a series of proximity graphs, organized in a stack which …

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