完成后停止 furrr::future_map 打印迭代

Question

I am using future_map to create several plots where I iterate through a list of variables and output/save a png file per variable to a folder. So there is no output that needs to be shown in the console or the "plot" pane.

The plotting part of the function:

  ggplot(aes(sample = value,
               color = key)) +
    stat_qq(alpha = 0.8, size = 0.5) +
    theme_light() +
    theme(legend.position = "none")  +
    stat_qq_line() +
    facet_wrap(~key,
               ncol = 4) +
    ggtitle(.var) +
    ggsave(filename = here::here(paste0(.path,
                                        .var,
                                        ".png")),
           units = "cm",
           width = 25,
           height = 10)}

How I map the function:

plan(multiprocess(workers = 10))
future_map(names_list,
           ~check_dists(df_lips_imputed, .x, "doc/distributions/testing2/"),
           verbose = FALSE)

However, after all files are created, I can see they are in the folder, this is slowly printed (takes a while, ~1k iterations):

[[1]]

[[2]]

[[3]]

...

Does anyone know how to suppress this output?

Many thanks!

Answer 1

If you install the development version of furrr with

devtools::install_github("DavisVaughan/furrr")

You can then use future_walk , which is acts like walk does versus map . With walk the function acts by side effects and so the return value is simply the input.

Answer 2

I was having the same issue. I'm not sure if this will change the time that it takes to print out the list elements at the end, but if you save your future_map call as a throwaway variable, it will save the output in that variable instead of printing out and clogging up your console or log file:

x <- future_map(names_list,
                ~check_dists(df_lips_imputed, .x, "doc/distributions/testing2/"),
                verbose = FALSE)