Nothing

```
# Average Commute Time
#
# Similarity measure based on random walker
#
# This function calculates vertex similarity based on the average number of
# steps, that random walker on the graph needs to get from one vertex to
# another.
#
similarity_act <- function(graph, v1, v2, ...){
L <- igraph::graph.laplacian(graph)
n <- igraph::vcount(graph)
m <- igraph::ecount(graph)
L_psinv <- solve(L - 1/n) + 1/n
score <- 2 * m * (diag(L_psinv) %*% t(rep(1, n)) +
rep(1, n) %*% t(diag(L_psinv)) -
2 * L_psinv)
score <- 1 / score
score[v1, v2]
}
```

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