get a RecursionError about umap HOT 4 OPEN

That would mean that the random projection trees are failing to split your data. I hadn't really anticipated such a thing happening, hence the weird error. Some possibilities: you have many points that are identical; the data has a very strange distribution; you have a lot of data. I'm guessing one of the first two.

I'll see if I can manage to at least catch this and give a more informative error to start with. Then I'll have to see if I can provide an alternative approach (random initialisation for NN-descent would do, for example).

Thanks for report!

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My data size is not huge, 100k level. There might be some identical data, i can not tell how many now. but this can happen in MINST as well if you binarize them. Is there any quick to go around this, e.g. change the #neighbors , or metric ?

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Increasing n_neighbors may help. Better would be to avoid the rp-tree initialisation, but I don't have code for that yet. If you really want to just get it to work now you can comment out lines 238 to 253 in umap/umap_.py in the current master and that will force it to fall back to random initialisation. It may be slower, but it should at least work (barring other errors later in the code that such a data distribution may trigger).

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I just committed what I hope is a fix that will at least allow the algorithm to continue. It will, unfortunately, be slower than it otherwise should be (something to be fixed later) but hopefully will get you passed this initial problem. If you have the opportunity I would appreciate it if you could clone from master and verify that this at least gets you beyond the current error.

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