`igraph`包中`closeness`定义的`mode`字段中的`total`是什么意思？

What does `total` mean in the field `mode` of `closeness` definition in `igraph` package?

igraph包中closeness定义的字段mode中的total是什么意思？

closeness(
  graph,
  vids = V(graph),
  mode = c("out", "in", "all", "total"),
  weights = NULL,
  normalized = FALSE
)

"total" 是 "all" 的别名，即忽略边缘方向。