Callback closure to activate the early stopping.
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The number of rounds with no improvement in the evaluation metric in order to stop the training.
whether to maximize the evaluation metric
the name of an evaluation column to use as a criteria for early
stopping. If not set, the last column would be used.
Let's say the test data in
whether to print the early stopping information.
This callback function determines the condition for early stopping
by setting the
stop_condition = TRUE flag in its calling frame.
The following additional fields are assigned to the model's R object:
best_score the evaluation score at the best iteration
best_iteration at which boosting iteration the best score has occurred (1-based index)
best_ntreelimit to use with the
ntreelimit parameter in
It differs from
best_iteration in multiclass or random forest settings.
The Same values are also stored as xgb-attributes:
best_iteration is stored as a 0-based iteration index (for interoperability of binary models)
best_msg message string is also stored.
At least one data element is required in the evaluation watchlist for early stopping to work.
Callback function expects the following values to be set in its calling frame:
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