PCA and TSNE return only NaN values for 256d -> 2d

[alexkli]

I have normalized 256 floating point vectors for which PCA and TSNE return 2d vectors with only NaN values. Using default parameters. No difference whether I pass a list of a few or hundreds of vectors.

The same vectors work fine using UMAP and return "good" 2d results.

No errors in the logs.

Version 0.6.0.

(Similarly, for FASTMAP I only get 0 values.)

[alexkli]

Well, of course I figured it out right after I posted the issue: problem was that a few of the input vectors had NaN values themselves.

It seems the current behavior of DruidJS 0.6.0 is if at least one input vector has NaN, then all results will be NaN too.

So maybe not a bug. But it might be awesome if this could be improved by

1. simply ignoring the NaN vectors/values (eg. as if they don't exist), but still give useful results for the rest
2. log some errors or other hint that this is happening