fixed typos in R package docs (#4345)
* fixed typos in R package docs * updated verbosity parameter in xgb.train docs
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@@ -13,12 +13,12 @@ Callback closure for logging the evaluation history
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This callback function appends the current iteration evaluation results \code{bst_evaluation}
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available in the calling parent frame to the \code{evaluation_log} list in a calling frame.
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The finalizer callback (called with \code{finalize = TURE} in the end) converts
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The finalizer callback (called with \code{finalize = TURE} in the end) converts
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the \code{evaluation_log} list into a final data.table.
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The iteration evaluation result \code{bst_evaluation} must be a named numeric vector.
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The iteration evaluation result \code{bst_evaluation} must be a named numeric vector.
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Note: in the column names of the final data.table, the dash '-' character is replaced with
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Note: in the column names of the final data.table, the dash '-' character is replaced with
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the underscore '_' in order to make the column names more like regular R identifiers.
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Callback function expects the following values to be set in its calling frame:
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