add documentation for datasets
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@@ -30,7 +30,7 @@ xgb.cv(params = list(), data, nrounds, nfold, label = NULL, showsd = TRUE,
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\item{label}{option field, when data is Matrix}
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\item{showd}{boolean, whether show standard deviation of cross validation}
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\item{showsd}{boolean, whether show standard deviation of cross validation}
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\item{metrics,}{list of evaluation metrics to be used in corss validation,
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when it is not specified, the evaluation metric is chosen according to objective function.
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