* Change DefaultEvalMetric of classification from error to logloss * Change default binary metric in plugin/example/custom_obj.cc * Set old error metric in python tests * Set old error metric in R tests * Fix missed eval metrics and typos in R tests * Fix setting eval_metric twice in R tests * Add warning for empty eval_metric for classification * Fix Dask tests Co-authored-by: Hyunsu Cho <chohyu01@cs.washington.edu>
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