memory-efficient

I was trying to copy an app name and it just darkened the copy option. At first I thought it was a GrapheneOS error, but tried another phone with the same resort.

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![cleaned2](https://user-images.githubusercontent.com/71944481/94848094-c5925480-0423-11eb-9e6d-223749ad6900

Hi! This is fantastic work, congratulations!

I'm, however, saddened by the somewhat hard-coded kNN graph computation, based solely on PCA, which can be misleading if data does not necessarily lie in a series of linear subspaces. A huge deal of work has been done lately on dimensional reduction, and thus restricting the kNN graphs to PCA is an important limitation. Is there any way to compute th