Memory limit

[HeesooSong]

Hi, thanks for the nice tool.

I was trying to generate a confusion matrix using get_celltype_mapping() function. My sce object contains a little less than 3000 genes (selected by retain_informative_genes()), and more than 5000 cells. The number of selected genes was 254.
However, I got the following error:
Something went wrong: likely memory is exhausted or features you selected can not be used for pca. Try downsampling, smaller n.neigh or smaller nPC.all.
When I tested further, it worked when 3100 cells were given as input. Now, I wonder how much memory is consumed by the algorithm. I am working on the server with a supercomputer, so I have 2TiB RAM... It would be nice if you could provide an approximate memory limit given certain parameters (nCells, nGenes, etc.).

Best,
Heesoo