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Callback for logging the evaluation history

Source: R/callbacks.R
xgb.cb.evaluation.log.Rd

Callback for logging the evaluation history

Usage

xgb.cb.evaluation.log()

Value

An xgb.Callback object, which can be passed to xgb.train() or xgb.cv().

Details

This callback creates a table with per-iteration evaluation metrics (see parameters evals and custom_metric in xgb.train()).

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.

See also

xgb.cb.print.evaluation