Plot feature importance as a bar graph

Plot previously calculated feature importance: Gain, Cover and Frequency, as a bar graph.

lgb.plot.importance(tree_imp, top_n = 10, measure = "Gain",
  left_margin = 10, cex = NULL)

Arguments

tree_imp	a data.table returned by lgb.importance.
top_n	maximal number of top features to include into the plot.
measure	the name of importance measure to plot, can be "Gain", "Cover" or "Frequency".
left_margin	(base R barplot) allows to adjust the left margin size to fit feature names.
cex	(base R barplot) passed as cex.names parameter to barplot.

Value

The lgb.plot.importance function creates a barplot and silently returns a processed data.table with top_n features sorted by defined importance.

Details

The graph represents each feature as a horizontal bar of length proportional to the defined importance of a feature. Features are shown ranked in a decreasing importance order.

Examples

data(agaricus.train, package = "lightgbm")
train <- agaricus.train
dtrain <- lgb.Dataset(train$data, label = train$label)

params <- list(
    objective = "binary"
    , learning_rate = 0.01
    , num_leaves = 63
    , max_depth = -1
    , min_data_in_leaf = 1
    , min_sum_hessian_in_leaf = 1
)

model <- lgb.train(params, dtrain, 20)

tree_imp <- lgb.importance(model, percentage = TRUE)
lgb.plot.importance(tree_imp, top_n = 10, measure = "Gain")