R: Callback closure for printing the result of evaluation

cb.print.evaluation {xgboost} | R Documentation

## Callback closure for printing the result of evaluation

### Description

Callback closure for printing the result of evaluation

### Usage

    cb.print.evaluation(period = 1, showsd = TRUE)

### Arguments

`period` | results would be printed every number of periods
`showsd` | whether standard deviations should be printed (when available)

### Details

The callback function prints the result of evaluation at every `period` iterations. 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` (also `bst_evaluation_err` when available), `iteration`, `begin_iteration`, `end_iteration`.

### See Also

`callbacks`

[Package xgboost version 1.3.0.1 Index]