xgb.plot.tree

0th

Percentile

Plot a boosted tree model

Read a tree model text dump and plot the model.

Usage
xgb.plot.tree(feature_names = NULL, model = NULL, n_first_tree = NULL, plot_width = NULL, plot_height = NULL, ...)
Arguments
feature_names
names of each feature as a character vector. Can be extracted from a sparse matrix (see example). If model dump already contains feature names, this argument should be NULL.
model
generated by the xgb.train function. Avoid the creation of a dump file.
n_first_tree
limit the plot to the n first trees. If NULL, all trees of the model are plotted. Performance can be low for huge models.
plot_width
the width of the diagram in pixels.
plot_height
the height of the diagram in pixels.
...
currently not used.
Details

The content of each node is organised that way:

• feature value;
• cover: the sum of second order gradient of training data classified to the leaf, if it is square loss, this simply corresponds to the number of instances in that branch. Deeper in the tree a node is, lower this metric will be;
• gain: metric the importance of the node in the model.

The function uses GraphViz library for that purpose.

Value

A DiagrammeR of the model.

Aliases
• xgb.plot.tree
Examples
data(agaricus.train, package='xgboost')

bst <- xgboost(data = agaricus.train$data, label = agaricus.train$label, max_depth = 2,
eta = 1, nthread = 2, nrounds = 2,objective = "binary:logistic")

xgb.plot.tree(feature_names = colnames(agaricus.train\$data), model = bst)


Documentation reproduced from package xgboost, version 0.6-3, License: Apache License (== 2.0) | file LICENSE

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