weird UMAP results and very inconsistent with CPU results

NVIDIA-Genomics-Research / rapids-single-cell-examples

Examples of single-cell genomic analysis accelerated with RAPIDS

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weird UMAP results and very inconsistent with CPU results #120

Open yubin-ai opened 5 months ago

yubin-ai commented 5 months ago

Sometimes I find the results from rapids KNN and UMAP very weird. The majoy data points are in center and super small (see below). At the beginning I thought it is the data issue. Today I ran the same data, same parameters with rapids on and off. It shows totally different results and without rapids it looks like a normal UMAP. It seems the UMAP could break with rapids version with some data.

liangxs7015 commented 2 months ago

Same issue I have met, any suggestions on how to solve it?