gdkrmr/coranking

Co-Ranking matrix and derived methods to assess the quality of dimensionality reductions

coranking's Issues

The LCMC value of MDS and PCA are equal ？Why?

Inverse function for tsne and umap

Hi,
I am trying to find the reconstruction error for umap and tsne. I get this error.

ir <- loadDataSet("3D S Curve")
ir.umap <- embed(ir, "UMAP", ndim = ndims(ir))
ir.tsne <- embed(ir, "tSNE", ndim = ndims(ir))
rmse <- data.frame(
rmse_umap = reconstruction_error(ir.umap),
rmse_tsne = reconstruction_error(ir.tsne)
)
matplot(rmse, type = "l")
plot(ir)
plot(ir.umap)
plot(ir.tsne)

This gives me an error:
Error in .local(object, ...): object does not have an inverse function
Traceback:

1. data.frame(rmse_umap = reconstruction_error(ir.umap), rmse_tsne = reconstruction_error(ir.tsne))
2. reconstruction_error(ir.umap)
3. reconstruction_error(ir.umap)
4. .local(object, ...)
5. getData(inverse(object, getData(getDimRedData(object))[, seq_len(n[i]),
   . drop = FALSE]))
6. inverse(object, getData(getDimRedData(object))[, seq_len(n[i]),
   . drop = FALSE])
7. inverse(object, getData(getDimRedData(object))[, seq_len(n[i]),
   . drop = FALSE])
8. .local(object, ...)
9. stop("object does not have an inverse function")

Please let me know where am I going wrong/ how to fix this issue. Thanks!