Using the UMAP dimensionality reduction algorithm as a graph layout

## Arguments

- g
igraph object

- pivots
if not NULL, number of pivot nodes to use for distance calculation (for large graphs).

- ...
additional parameters for umap. See the

`?uwot::umap`

for help.- circular
not used

## Details

The layout_igraph_* function should not be used directly. It is only used as an argument for plotting with 'igraph'. UMAP can be tuned by many different parameters. Refer to the documentation at https://github.com/jlmelville/uwot for help

## References

McInnes, Leland, John Healy, and James Melville. "Umap: Uniform manifold approximation and projection for dimension reduction." arXiv preprint arXiv:1802.03426 (2018).

## Examples

```
library(igraph)
g <- sample_islands(10, 20, 0.6, 10)
# xy <- layout_with_umap(g, min_dist = 0.5)
```