LightGBM unloading error fix — lgb.unloader • lightgbm

Attempts to unload LightGBM packages so you can remove objects cleanly without having to restart R. This is useful for instance if an object becomes stuck for no apparent reason and you do not want to restart R to fix the lost object.

lgb.unloader(restore = TRUE, wipe = FALSE, envir = .GlobalEnv)

Arguments

restore	Whether to reload `LightGBM` immediately after detaching from R. Defaults to `TRUE` which means automatically reload `LightGBM` once unloading is performed.
wipe	Whether to wipe all `lgb.Dataset` and `lgb.Booster` from the global environment. Defaults to `FALSE` which means to not remove them.
envir	The environment to perform wiping on if `wipe == TRUE`. Defaults to `.GlobalEnv` which is the global environment.

Value

NULL invisibly.

Examples

data(agaricus.train, package = "lightgbm")
train <- agaricus.train
dtrain <- lgb.Dataset(train$data, label = train$label)
data(agaricus.test, package = "lightgbm")
test <- agaricus.test
dtest <- lgb.Dataset.create.valid(dtrain, test$data, label = test$label)
params <- list(objective = "regression", metric = "l2")
valids <- list(test = dtest)
model <- lgb.train(
  params = params
  , data = dtrain
  , nrounds = 5L
  , valids = valids
  , min_data = 1L
  , learning_rate = 1.0
)
#> [LightGBM] [Warning] Auto-choosing row-wise multi-threading, the overhead of testing was 0.000864 seconds.
#> You can set `force_row_wise=true` to remove the overhead.
#> And if memory is not enough, you can set `force_col_wise=true`.
#> [LightGBM] [Info] Total Bins 232
#> [LightGBM] [Info] Number of data points in the train set: 6513, number of used features: 116
#> [LightGBM] [Info] Start training from score 0.482113
#> [LightGBM] [Warning] No further splits with positive gain, best gain: -inf
#> [1]:	test's l2:6.44165e-17 
#> [LightGBM] [Warning] No further splits with positive gain, best gain: -inf
#> [2]:	test's l2:1.97215e-31 
#> [LightGBM] [Warning] No further splits with positive gain, best gain: -inf
#> [3]:	test's l2:0 
#> [LightGBM] [Warning] No further splits with positive gain, best gain: -inf
#> [LightGBM] [Warning] Stopped training because there are no more leaves that meet the split requirements
#> [4]:	test's l2:0 
#> [LightGBM] [Warning] No further splits with positive gain, best gain: -inf
#> [LightGBM] [Warning] Stopped training because there are no more leaves that meet the split requirements
#> [5]:	test's l2:0 

if (FALSE) {
lgb.unloader(restore = FALSE, wipe = FALSE, envir = .GlobalEnv)
rm(model, dtrain, dtest) # Not needed if wipe = TRUE
gc() # Not needed if wipe = TRUE

library(lightgbm)
# Do whatever you want again with LightGBM without object clashing
}