Instacrash when fittransform-ing in fluid.umap~

[rconstanzo]

I remember this being an issue a while back but it being fixed (hence the fluid.umap~: Number of Neighbours is larger than dataset error message now when trying to fittransform something that has fewer dimensions than @numneighbours) but there appears to have been an oversight when coding it as it gives a nice instacrash when fittransform-ing a dataset with the same amount of dimensions as @numneighbours.

patch.zip

I imagine this means that a > needs to get changed to a >= when running the size check.

Also including three crash reports, two of which point to a gnarly UMAP error but the third one is different (no flucoma mention at all), so including it in case it's indicative of something else happening at the same time.

crash reports.zip

[lewardo]

I've managed to reproduce the bug, and got the stacktrace to a segfault in UMAP.hpp:373 in fluid::algorithm::UMAP::makeGraph, in the *nearestIds[pos] when discardFirst is set to true, the pos index goes out of bound on the last iteration of the for loop, possibly the boundary checks of the nearestIds doesnt check for overflow

[rconstanzo]

I don't know if something was changed with this in the update(s) since this, but this is much more prone to crashing now.

Between this issue and #331 it seemed like having not only the same number of dimensions as @neighbours will instacrash Max, also having less will prompt an instacrash. What's odd is that it appears to only happen with a smaller dataset. I haven't programmatically narrowed things down to see where this starts happening, but here's a patch that shouldn't crash, but certainly does.

At the moment I'm coding something based around small-ish datasets (~10-20 entries) and it's basically a dice roll every time I do it whether Max crashes or not based on this bug.

<pre><code>
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-----------end_max5_patcher-----------
</code></pre>

Max version 8.6.2
OSX 14.4.1
FluCoMa version 1.0.7

[rconstanzo]

Ok, narrowed it down.

Max will crash if you have a fluid.dataset~ with where size == @neighbours in fluid.umap~ OR if size =< 6.

For some reason if your fluid.dataset~ size is 6 or less, it will crash when trying to fittransform.

<pre><code>
----------begin_max5_patcher----------
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-----------end_max5_patcher-----------
</code></pre>

[rconstanzo]

Haven't tested all the permutations of this, but the <6d thing also instacrashes pd (0.53):