Callback closure for printing the result of evaluation
cb.print.evaluation(period = 1, showsd = TRUE)
results would be printed every number of periods
whether standard deviations should be printed (when available)
The callback function prints the result of evaluation at every
The initial and the last iteration's evaluations are always printed.
Callback function expects the following values to be set in its calling frame:
bst_evaluation_err when available),
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