change doc and demo for new obj feval interface
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@@ -7,8 +7,8 @@
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xgb.cv(params = list(), data, nrounds, nfold, label = NULL,
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missing = NULL, prediction = FALSE, showsd = TRUE, metrics = list(),
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obj = NULL, feval = NULL, stratified = TRUE, folds = NULL,
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verbose = T, printEveryN=1L, early_stop_round = NULL, early.stop.round = NULL,
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maximize = NULL, ...)
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verbose = T, printEveryN = 1L, early_stop_round = NULL,
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early.stop.round = NULL, maximize = NULL, ...)
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}
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\arguments{
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\item{params}{the list of parameters. Commonly used ones are:
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