cb.evaluation.log: Callback closure for logging the evaluation history

In xgboost: Extreme Gradient Boosting

Callback closure for logging the evaluation history

Description

Callback closure for logging the evaluation history

Usage

cb.evaluation.log()

Details

This callback function appends the current iteration evaluation results bst_evaluation available in the calling parent frame to the evaluation_log list in a calling frame.

The finalizer callback (called with finalize = TURE in the end) converts the evaluation_log list into a final data.table.

The iteration evaluation result bst_evaluation must be a named numeric vector.

Note: in the column names of the final data.table, the dash '-' character is replaced with the underscore '_' in order to make the column names more like regular R identifiers.

Callback function expects the following values to be set in its calling frame: evaluation_log, bst_evaluation, iteration.

See Also

callbacks

xgboost documentation built on March 31, 2023, 10:05 p.m.